Dmrs cdm group. Google Scholar [2] 3GPP TR 38.

Dmrs cdm group All reactions. , 0 or 1) to multiple ports (e. curBwp, numLayers = 2) # This PDSCH is using CDM group 0 only. It is automatically Mar 2, 2025 · ### 资源映射中的DMRS分配机制 在NR（New Radio）系统中，DMRS（Demodulation Reference Signal ）用于下行链路信道估计和解调 首页 在解资源映射中，为什么地址除以4的余数与小区id除以4的余数相等时，对应的数据就是dmrs 在解资源映射中，为 Methods and apparatuses are disclosed for Physical Uplink Shared Channel (PUSCH) Demodulation Reference Signal (DMRS) design in, e. Group Radio Access Mar 8, 2020 · 文章浏览阅读2w次，点赞27次，收藏144次。CSI-RS是5G NR系统中非常重要的一种参考信号，我会写几篇文章介绍其相关内容。本文重点讲讲它的时频资源分配，看看它长什么样子。CSI-RS中的CDM概念在讨论物理资源映射之前，先交代一个重要的 This value is nominally % greater than the maximum configured CDM group number. 4b using the (+) and (−) symbols. 214 Section 5. Sign Out; Contact MathWorks Support; Visit mathworks. In 5G DMRS, there are two Mar 3, 2025 · 抱歉，您所在的用户组(游客)无法进行此操作 Nov 1, 2024 · 这里DMRS resource index是由DMRS port和DMRS sequecnce 决定的，如上图蓝色字体，而DMRS port由msgA-Pusch-NrofPorts结合msgA-PUSCH-DMRS-CDM-Group确定，因为这两个参数可以确定DMRS port数，DMRS Mar 6, 2025 · num_ues (int) – Number of UEs in the UE group. If symbolNumber is a scalar and slotNumber is an array N (number of DMRS sequence) Dec 5, 2019 · A)DMRS,including co-scheduled DMRS ports in the indicated CDM group without data。 B)NZP CSI-RSfor CSI acquisition, beam management, tracking (TRS), excluding CSI-RS formobility。 C)PT-RS 及 SSB。 D)DetectedPDCCH。 26. . For a two-port OFDM system, the difference of \\(n_{cs}\\) between the two ports determines the separation degree of the CIRs of the two ports when performing channel estimation. 1 — CDM group number 0. 214-Table 6. 2表格中的第二列，即“Number of DMRS CDM group (s) without data”，表示当前哪些CDM的RE不能复用数据。 根据不同的配置参数，该字段可以取1、2、3这三种值（图5. Dec 30, 2020 · 2/3（1个前置DMRS符号） 2/3/8/9（2个前置DMRS符号） 第3组CDM group 2指的是红色所示DMRS RE，对应的DMRS port 为 4/5（1个前置DMRS符号） 4/5/10/11（2个前置DMRS符号） 现网配置如下： 举报/反馈 余网优化 1363获赞 650粉丝 专注通信领域无线 Dec 25, 2023 · 使用相同子载波的端口属于相同的码域复用( CDM )组。因此，端口1000和端口1001属于同一个CDM group 0。同样，端口1002和1003使用相同的奇数子载波，因此属于CDM group 1。这些2端口和4端口的DM - RS. Antenna ports indexes {1000} for 1 Layer CCs {1000, 1001} for 2 Layers CCs {1000 – 1003} for 4 Layers CCs. Mar 29, 2022 · DMRS on the antenna port 2 is a cyclic shift version of port 1. , there are 4 antenna ports per CDM group rather than Aug 6, 2022 · Understanding the location of PUSCH DMRS is simple, but generating the DMRS is not that simple. Sep 18, 2020 · Email me at this address if a comment is added after mine: Email me if a comment is added after mine Feb 20, 2025 · Coupled with Coding Rate, Modulation, DMRS Configuration, Symbol Number, Number of DMRS CDM Group Without Data, RA Type, RB Number, Number of Layers, BWP, MCS and MCS Table. Default: Type1 Jul 19, 2023 · Sequence generation 上行PUSCH 的DM-RS和PDSCH的DM-RS很相似，也分为两类：front-loaded DMRS和additional DMRS。而且PUSCH的DMRS和PDSCH的DMRS在时频域位置的处理算法以及相关front-loaded DMRS和additional DMRS的长度算法以及处理流程方面都很类似，如果大家能把这两者结合起来看，会很容易理解。 Feb 18, 2025 · Irrespective of downlink or uplink transmission, the number of layers depend on the number of DMRS ports. May 5, 2021 · 文章浏览阅读2k次。这篇博客详细介绍了LTE网络中解调参考信号（DMRS）的计算方法，包括PDSCH映射类型、前置导频的符号数、CDM组数、DMRS类型和额外DMRS数量等因素。DMRS的占用会影响可用的数据业务RE数，其计算与流数变化直接 Apr 30, 2023 · DMRS CDM组是指在一个OFDM符号中，用于传输下行PDSCH DMRS的CDM符号的集合。 CDM符号是由DMRS符号通过线性变换得到的，用于提高DMRS的频谱效率。 在5G NR中，DMRS CDM组的大小由参数NumCDMGroupsWithoutData决定，该参数的值取决于PDSCH映射类型和DMRS类型。 Nov 29, 2021 · 如果在进行了一定数量的MsgA的传输 后，2-step RA 还没有完成，UE有收到配置 可以转换为4-step RA。 这里DMRS resource index是由DMRS port和DMRS sequecnce 决定的，如上图蓝色字体，而DMRS port由msgA-Pusch-NrofPorts结合msgA-PUSCH-DMRS-CDM-Group确定，因为这两个参数可以确定DMRS port数，DMRS sequecnce 由nrofDMRS DMRS TYPE2下，CDM group有3 组： 第1组CDM group 0指的是蓝色所示DMRS RE，对应的DMRS port为 0/1（1个前置DMRS符号） 0/1/6/7（2个前置DMRS符号） Table 7. NumCDMGroupsWithoutData = 1; % 1 corresponds to CDM group number 0 % The read-only properties DeltaShifts and DMRSSubcarrierLocations of DMRS % property of pdsch object provides the values of delta shift(s) and DM-RS % subcarrier locations in an RB for WO2023114613A1 PCT/US2022/080179 US2022080179W WO2023114613A1 WO 2023114613 A1 WO2023114613 A1 WO 2023114613A1 US 2022080179 W US2022080179 W US 2022080179W WO 2023114613 A1 WO202 Jan 31, 2011 · 1. Constant('OutputDataType'),coder. Let x 1[n],x 2[n] donate the DMRS sequence on the antenna port 1, port 2, respectively. In LTE (at least in TM1, 2, 3, 4), we don't need this kind of special DMRS for PDSCH because we can use Nov 12, 2024 · 图5. 212, sec 7. Initial S/W Revision. com; Toggle navigation Contents . User Defined PRB Bundle Size - When PRB Bundle Size is set to User Defined, enter a custom PRB bundle size (RBs per bundle). For example, if the DMRS ports is defined as "0,2", the minimum value of this setting is 2 because port 0 and port 2 use different CDM group, if DMRS ports is defined as "0,1" the minimum value of this setting is 1 because port 0 and port 1 share same CDMA group. Important. On each symbol, α0,2,4,=β {r (0), -r (1), r (2), -r (3), } CDM group numbers corresponding to each DM-RS port, specified as one of these options. Rate Matching. Preset. , there are 4 antenna ports per CDM group rather than 2 antenna ports per CDM Nov 7, 2023 · In TS 38. Applies to the M9484C only. 1-1: Valid S and L combinations > < PDSCH Mapping Type > Type A : PDSCH DMRS is Type A; The DMRS location is fixed to 3rd (pos2) or 4th(pos3) US20240048300A1 US18/365,928 US202318365928A US2024048300A1 US 20240048300 A1 US20240048300 A1 US 20240048300A1 US 202318365928 A US202318365928 A US 202318365928A US 2024048300 A Aug 29, 2020 · 2/3/8/9（2个前置DMRS符号） 第3组CDM group 2指的是红色所示DMRS RE，对应的DMRS port 为 4/5（1个前置DMRS符号） 4/5/10/11（2个前置DMRS符号） 另外，在5G建网初期，用户不多，可以使用CSI-RS、PDCCH等在时域上的资源，来提升PDSCH可用 In addition, when DMRS type 2 is used and the PDSCH uses ports from all three CDM groups, as in the case of two codeword transmissions of rank 5 or 6, the first TCI state is the first CDM group (eg For example, associated with the DMRS ports for CDM group 0 of FIGS. Spec. 211标准，CSI-RSRP的确定应使用在天线端口3000上传输的CSI参考信号。 Oct 16, 2024 · 支持最大6个正交的单符号DMRS。支持最大12个正交的双符号DMRS。 映射公式如下：k即DMRS频域映射相对于CRB0的位置。 对于Configuration Type1和Type 2的DMRS，分多个CDM组（CDM group），即多个DMRS天线端口，通过时频域码分的方式复用在一 Mar 5, 2025 · num_dmrs_cdm_grps_no_data = 2, dmrs_scrm_id = 41, start_prb = 0, num_prbs = 273, prg_size = 1, num_ul_streams = 1, dmrs_syms = None, dmrs_max_len = 2, dmrs_add_ln_pos = 1, start_sym = 2, based API is used. When this parameter changed, the DMRS power boosting is Jul 26, 2021 · 5G－NR参考信号专题参考信号为了便于多径通信信道的估计和可靠的通信／控制信道的相干检测，OFDM系统利用了参考信号（或导频子载波）。导频子载波在时间－频率资源网格上的导频位置上提供信道频率响应的估计。可以使用插值技术估计其他时 Jul 10, 2024 · 9、在一些情况下，rrc信令可以配置以下至少一者：在所述多个非连续资源上映射的所述cdm组内使能应用所述occ的dmrs端口；利用所述多个dmrs端口的下行链路传输的方案，以应用所述多个非连续资源上映射的cdm组中的occ；或利用所述多个dmrs端口的上行 Jul 26, 2021 · DM－RS Type 2的结构与Type 1类似，只是支持的天线接口数量有所不同。Type 2的每个CDM组由两个相邻的子载波组成，其长度为2的正交序列用于分离共享同一组子载波的两个天线端口。每个资源块和每个CDM组中使用4个子载波。 Jun 1, 2021 · Then, the first DMRS port is with the TDL-C channel and t he second DMRS port is with the channel with equal-power power delay profiles and maximum channel delay spread 9 . 10. Oct 16, 2024 · 文章浏览阅读2. dmrs = nrPUSCHDMRSConfig. NumCDMGroupsWithoutData = 1; % 1 corresponds to CDM group number 0 % The read-only properties DeltaShifts and DMRSSubcarrierLocations of DMRS % property of pdsch object provides the values of delta shift(s) and DM-RS % subcarrier locations in an RB for May 23, 2024 · A group of papers is dedicated to system design and in particular numerology, frame structure, reference signals, multi-antenna schemes, the main parameters of its configuration defined by 3GPP standard are dmrs-Type, dmrs-maxLength and dmrs-AdditionalPosition, which are provided by higher layers via DMRS-DownlinkConfig message. 5 EP4449656A1 EP22830096. setter def num_cdm_groups_without_data (self, value): Aug 4, 2023 · The present application relates to devices and components including apparatus, systems, and methods that support multiple demodulation reference signal (DMRS) ports per code division multiplexing (CDM) group. i. orthogonal DMRS ports may be assumed in the table 904. 211 中有介绍。DMRS是用于信道估计，服务于UE信道解调的。基站将DMRS穿插到各种信道的时频资源里面去，伴随着数据一起发送给UE；对UE来说，DMRS是一个确知信号，UE根据DMRS可以会得到表征信道特征的估计矩阵，然后就可以根据信道特征矩阵，去对应的位置解析承载的 Mar 3, 2024 · 通过CDM，不同天线端口的DMRS序列可以在相同的时频资源上复用，以实现信道估计和UE间的信号分离。文章详细阐述了CDM的协议规范和原理，包括双DMRS配置类型1的示例，并探讨了正交码分复用（OCC）的概念。 【5G】PDSCH/PUSCH DMRS CDM Apr 5, 2021 · 第1组CDM group 0指的是蓝色所示DMRS RE，对应的DMRS port为 0/1（1个前置DMRS符号） 0/1/6/7（2个前置DMRS符号） 第2组CDM group 1指的是黄色所示DMRS RE，对应的DMRS port为 2/3（1个前置DMRS符号） 2/3/8/9（2个前置DMRS符号） 第3组CDM group 2指的是红色所示DMRS RE，对应的DMRS port为 4/5（1个前置DMRS符号） 4/5/10/11（2个前 This value is nominally % greater than the maximum configured CDM group number. For example, when specifying 'single' as the output data type, include {coder. 1 You must be logged in to vote. For example, when the base station sends data to a UE, the UE-specific demodulation reference signal (DMRS) is only sent within the Mar 3, 2022 · In the picture above the symbol 0 is occupied by PDCCH (yellow), the symbols 2 and 11 are totally occupied by either DMRS group i. Number of additional DMRS. The mapping type indicates the first DM-RS OFDM symbol location and the duration of OFDM symbols (l d). 212] is used, otherwise . 214-Table 5. Antenna ports indexes {1000} for Rank 1 tests {1000, 1001} for Rank 2 tests {1000-1002} for Rank 3 tests {1000-1003} for Rank 4 tests. 65860 µs . The pilot signals belonging to the same CDM group are multiplied by orthogonal cover codes which allow separating them during channel estimation. PUSCH DMRS CDM group without data 1. 3 — CDM group numbers 0, 1, dmrs = nrPDSCHDMRSConfig with properties: DMRSConfigurationType: 2 DMRSReferencePoint: 'CRB0' DMRSTypeAPosition: 2 DMRSAdditionalPosition: 2 Can Sionna's pilot (DMRS) model the CDM group? If so, how can it be used? Thank you so much. This value is nominally % greater than the maximum configured CDM group number. Sep 11, 2023 · DMRS ports 0,1,4, 5 shares one CDM group and port 2,3,6 and 7 share another CDM group. 00. 2 for 4 Layers CCs. Yes. 4k次。本文详细介绍了5GNR中DMRS（解调参考信号）的生成过程，包括转换预编码禁用和启用的情况。在转换预编码禁用时，DMRS基于长度为31的Gold序列生成；启用时，分为ZC序列和Gold序列两种类型。DMRS在PUSCH上的映射 Sep 11, 2023 · 首先，NR中的DMRS序列有两种类型，即Type1和Type2。Type1的序列每两个子载波映射一个序列值，而Type2则是每三个子载波映射一个序列值。这两种类型的DMRS在资源元素（RE）的映射方式上有所不同，分别适用于不同的CDM Oct 7, 2020 · In this study, the channel estimation performance of the 5G demodulation reference signals (DMRS) for physical downlink shared channel (PDSCH) is investigated for various DMRS parameter configurations. You can easily modify them according to your needs. It is automatically updated by an MCS index change. Beta Was this translation helpful? Give feedback. 5G-PDSCH-DMRS-5G下行PDSCH之DMRS 信号 首页 文档 视频 音频 文集 文档 公司财报 行业研究 • 类型 1 在单符号情况下，最多支持 4 个端口，端口 01 和 23 分别在不同的 CDM group， 每个 CDM group 内，比如端口 0 和 1，又通过频域的 OCC 来实现 Apr 14, 2022 · DMRS_CDM_group是个strig还是int :: weixin_31632751 关注 关注 0 点赞 踩 0 收藏 觉得还不错? 一键收藏 知道了 0 评论 分享 复制链接 分享到 QQ 分享到新浪微博 扫一扫 举报 举报 Python: [TypeError] bad operand type for Feb 25, 2025 · The PUSCHTransmitter and PUSCHReceiver provide high-level abstractions of all required processing blocks. can be improved. num_dmrs_cdm_grps_no_data (int) – Number of DMRS CDM groups without data [3GPP TS 38. May 18, 2024 · arg[4] is lambdaBar (\(\bar{\lambda}\)) (int) - It is defined by CDM group \(\in \{0,1,2\}\). In one embodiment, a wireless device (22) configured to communicate with a network node (16) is provided. 214 Table 4. Constant('single')} in the -args value of the codegen function. The WTRU, based on the DCI, may associate a first DMRS port with a first CDM group and associate a second DMRS port with a second CDM group. Following is the chain of algorithms from 36. NumCDMGroupsWithoutData = 1; % 1 corresponds to CDM group number 0 % The read-only properties DeltaShifts and Feb 24, 2020 · 文章浏览阅读3. 211 a method of a base station in a wireless communication system includes transmitting a first message associated with demodulation reference signal (DMRS) type information and DMRS symbol length information, transmitting a second message including port number information for receiving a DMRS by a terminal and transmitting the DMRS to the terminal based on the Jul 13, 2020 · 最后可以计算出8个port上时域，频域和码分的映射情况如下。可以看出8个port使用了4个CDM Group，每个CDM Group复用2个port。 再举一个栗子，我想这样就清晰多了： 按照端口数目以及cdm-Type，就能知道具体端口号 Jun 23, 2023 · Feature 2: DMRS FOR PDSCH(Double Symbol) A pair of symbols increases the code multiplexing capability of the DMRS. Feb 20, 2025 · DMRS ports 0,1,4, 5 shares one CDM group and port 2,3,6 and 7 share another CDM group. Creation. – the case dmrs-AdditionalPosition equals to ‘pos3’ is only Mar 28, 2024 · 2 Step RACH. 关于 additional DMRS Sep 7, 2020 · DM-RS typeA-pos (DMRS TypeA Position) = 3 DM-RS config-type (DMRS Configuration Type) = 1 DM-RS add-pos (DMRS Additional Position) = 0 CDM Group Without Data (Number of DMRS CDM groups without Data)= 1 9. For mapping type A, l d is the duration between the first OFDM symbol of the slot and the last OFDM symbol of the allocated PUSCH resources. nr. 211 中有介绍。DMRS是用于信道估计，服务于UE信道解调的。基站将DMRS穿插到各种信道的时频资源里面去，伴随着数据一起发送给UE；对UE来说，DMRS是一个确知信号，UE根据DMRS可以会得到表征信道特征的估计矩阵，然后就可以根据信道特征矩阵，去对应的位置解析承载的 Jan 11, 2023 · 天线端口采用FDM+CDM映射，结合本文上半部分介绍的参数，dmrs-Type，dmrs-Addiotionalposition和Maxlength三个参数则显得尤为重要。 Maxlength在使用2个符号时候在大时延情况下的覆盖性能比使用1个符号时候要优秀很多。 Jan 15, 2020 · 如果DMRS-DownlinkConfig IE 中的高层参数maxLength等于'len2'，则单符号或双符号DM-RS由关联的DCI确定 UE可以假设相同CDM组内的PDSCH DM-RS关于多普勒频移，多普勒扩展，平均延迟，延迟扩展和空间Rx是准共站址的。UE可以假设与PDSCH 相 In 3GPP specification, you would just specify a single value that are mapped to a set of property made up of dmrs type, dmrs max length, number of dmrs cdm group and dmrs port numbers. Type Mar 2, 2020 · 4端口时，CDM-Type为fd-CDM2， X=4, Y=4, Z=1或X=4， Y=2， Z=2，即可由两个两端口组合而成，同时进行CDM和FDM或者CDM、FDM和TDM。值得注意的是，在CDM Group内，是以先频域后时域的顺序进行索引的。CSI-RS 4端口的图样如下图所示 Dec 17, 2024 · # Create a 2-layer PDSCH with Mapping Type A (default) using All Symbols and PRBs in the BWP (default) pdsch = PDSCH (carrier. Jul 16, 2023 · CDM(Code Division Multiplexing) group is a group of two or four resource elements for which OCC (Orthogonal Cover Code) is applied using time and/or frequency direction. 2 for Rank 3 and Rank 4 tests. BaseGraph. Sep 11, 2023 · Coupled with Coding Rate, Modulation, DMRS Configuration, Symbol Number, Number of DMRS CDM Group Without Data, RA Type, RB Number, Number of Layers, BWP, MCS and MCS Table. Integer from 0 to 2 — When property is a scalar, specifying single DM-RS antenna port. A. State Saved. 1 for Rank 1 and Rank 2 tests. 8-9 ), the second TCI state is that of the second and third CDM groups (eg, CDM This value is nominally % greater than the maximum configured CDM group number. Phase noise produced in local oscillators introduces a For type 2 DM-RS, there are three CDM groups. Dec 1, 2022 · 参考信号相关的所有内容都在38. Google Scholar [2] 3GPP TR 38. CSI-RS May 9, 2023 · 文章浏览阅读2. Otherwise, the pipeline gets run only for a single UE group sharing the same time-frequency resources, i. In Configuration type 2, the minimum resource element group in frequency domain is two consecutive REs. setDMRS Usage notes and limitations: The datatype input argument must be compile-time constant. 15 DMRS and Rel. Number of PDSCH DMRS CDM group(s) without data. The channel mapping of the Rel-18 enhanced DMRS in the physical layer *27, with CDM group *28 #0 as an example, is shown in Figure 1. Press [Copy to All Slot] in the [F2] PUSCH / DM-RS tab. < 38. e. See the pictures May 20, 2022 · Sequence generation上行PUSCH 的DM-RS和PDSCH的DM-RS很相似，也分为两类：front-loaded DMRS和additional DMRS。 而且PUSCH的DMRS和PDSCH的DMRS在时频域位置的处理算法以及相关front-loaded DM-RS is used for channel estimation as part of coherent demodulation of PDSCH. Jun 25, 2022 · 1）对于PDSCH的DMRS，根据没有数据的DMRS CDM组的数量（参数Number of DMRS CDM group(s) without data，下文有定义）来假定PDSCH EPRE 对 DMRS EPRE的比率（ [dB]），如下表[TS 38. 18 DMRS in Mar 28, 2024 · cg-DMRS-Configuration DMRS-UplinkConfig, mcs-Table ENUMERATED {qam256, qam64LowSE} OPTIONAL, mcs-TableTransformPrecoder ENUMERATED {qam256, qam64LowSE} OPTIONAL, Mar 28, 2024 · 2 Step RACH. The DMRS may be coded with one of a plurality of expanded orthogonal cover codes (OCCs) belonging to an expanded CDM group. 8) of the 8-layer DMRS pattern. 2的配置参数只能取1、2这两个值）。 各 Mar 28, 2024 · In Configuration type 1, the minimum resource element group in frequency domain is one RE. 1. _num_cdm_groups_without_data @num_cdm_groups_without_data. having the same PRB Oct 13, 2024 · 参考信号相关的所有内容都在38. Uplink algorithm. 1. Range: 1 to 2 for DMRS configuration type 1; 1 to 3 for DMRS configuration type 2. A FDM entry corresponds to a code division multiplexing (CDM) group. NumCDMGroupsWithoutData = 1; % 1 corresponds to CDM group number 0 % The read-only properties DeltaShifts and DMRSSubcarrierLocations of DMRS % property of pdsch object provides the values of delta shift(s) and DM-RS % subcarrier locations in an RB for Symbol allocation of PUSCH indicates the OFDM symbol locations allocated for the PUSCH transmission in a slot. 16. Whether and how to enable MU-MIMO between Rel. the table 902 provides antenna port (s) , scrambling identity and number of layers indication for legacy MU DMRS pattern. 211 中有介绍。DMRS是用于信道估计，服务于UE信道解调的。基站将DMRS穿插到各种信道的时频资源里面去，伴随着数据一起发送给UE；对UE来说，DMRS是一个确知信号，UE根据DMRS可以会得到表征信道特征的估计矩阵，然后就可以根据信道特征矩阵，去对应的位置解析承载的 Sep 11, 2023 · 2- DMRS FOR PDSCH- Double Symbol ( Configuration Type 1 ) Using a pair of symbols increases the code multiplexing capability of the DMRS, i. , there are 4 antenna ports per CDM group rather than 2 antenna ports per CDM group. 4. This increases the total number of antenna ports and so increases the scope for Multi-User MIMO. Sep 11, 2023 · Using a pair of symbols increases the code multiplexing capability of the DMRS, i. Dec 23, 2018 · 2、什么是DMRS的映射类型？DMRS有哪几种映射类型？ 3、UE怎么获取DMRS的时域起始位置？ 4、什么是DMRS的配置类型？DMRS有哪几种配置类型？ 5、UE怎么计算DMRS的时频位置？ 6、DMRS信号与天线端口是什么关系？为什么需要CDM和OCC？为什么 Dec 11, 2024 · 对于上述旨在提高可靠性的传输方案，每个 PDSCH 传输场合最多限制为两个传输layer，并且指示的 DMRS 端口预计在一个 CDM group内。 与第二个 TCI 状态相关联的 PDSCH 传输场合的RV相对于rv_s 的值按sequenceOffsetforRV-r16 偏移（如果适用），RV的确定如上图第一个TCI state按照第一个表格来，第二个TCI state按照第 The solution to this problem are the so-called code division multiplexing (CDM) groups in 5G NR. 211 中有介绍。DMRS是用于信道估计，服务于UE信道解调的。基站将DMRS穿插到各种信道的时频资源里面去，伴随着数据一起发送给UE；对UE来说，DMRS是一个确知信号，UE根据DMRS可以会得到表征信道特征的估计矩阵，然后就可以根据信道特征矩阵，去对应的位置解析承载的 Feb 25, 2025 · The solution to this problem are the so-called code division multiplexing (CDM) groups in 5G NR. Row vector of integers from 0 to 2 — When property is a Dec 15, 2023 · DMRS CDM组是指在一个OFDM符号中，用于传输下行PDSCH DMRS的CDM符号的集合。CDM符号是由DMRS符号通过线性变换得到的，用于提高DMRS的频谱效率。在5G NR中，DMRS CDM组的大小由参数NumCDMGroupsWithoutData决定，该参数的值取决 Symbol allocation of PUSCH indicates the OFDM symbol locations allocated for the PUSCH transmission in a slot. In 3GPP specifications, the orthogonality across the ports is achieved by frequency division multiplexing (FDM) or code division multiplexing (CDM). Set the number of DMRS CDM groups without data, which is used to determine how many resource elements are reserved for DMRS. To compensate for the common phase error (CPE), 3GPP 5G NR introduced PT-RS. num_prbs (int) – Number of allocated PRBs for the UE group. But there are so many parameters being used to create a specific Zadoff-Chu sequence for a specific case. 0A CN202280002735A CN117796096A CN 117796096 A CN117796096 A CN 117796096A CN 202280002735 A CN202280002735 A CN 202280002735A CN 117796096 A CN117796096 A CN 117796096A Authority CN China Prior art keywords dmrs cdm group port configuration information pusch Prior art date 2022-07-28 Legal status (The Jan 12, 2024 · PDSCH DMRS配置类型（DMRS type）：DMRS类型有时候也称为DMRS配置类型，它决定着DMRS在频域中的RE映射密度。3GPP为PDSCH DMRS规定了两种配置类型：type 1和type 2，如下图所示。对于type 1来说，DMRS RE在某个符号的频域间隔分布 Mar 4, 2020 · CDM 与天线端口 不同CDM方式下，一组CDM码支持的天线端口如下图13所示。横向为符号，纵向为子载波。CDM 的正交性 一组CDM码中不同天线端口的信号是如何实现信号正交的呢？我们以CDM8为例来看下。TS38. Dec 14, 2023 · 文章浏览阅读1. Big picture is simple since PUSCH DMRS is also a kind of Zadoff - Chu Sequence. When this value is true, at most 24 DMRS ports can be allocated in one CDM group. (number of DMRS sequence) = length of symbolNumber. MRC, MMSE for equalizer. Type 1. , 0-2). UL Channel Estimation LS. _ifndef ("num_cdm_groups_without_data", 2) return self. Length. PUSCH users per TTI. 8A EP22830096A EP4449656A1 EP 4449656 A1 EP4449656 A1 EP 4449656A1 EP 22830096 A EP22830096 A EP 22830096A EP 4449656 A1 EP4449656 A1 EP 4449656A1 Authority WO2023114613A1 PCT/US2022/080179 US2022080179W WO2023114613A1 WO 2023114613 A1 WO2023114613 A1 WO 2023114613A1 US 2022080179 W US2022080179 W US 2022080179W WO 2023114613 A1 WO202 Nov 12, 2024 · DMRS ports 0,1,4, 5 shares one CDM group and port 2,3,6 and 7 share another CDM group. PTRS configuration. 1 for 1 layer and 2 layers CCs. Distinct orthogonal DMRS se- PDSCH DMRS configuration. Y. To be honest, the number of steps would look differently depending on how to split the whole procedure Nov 1, 2024 · PDSCH DMRS映射类型（mapping type）：映射类型决定着DMRS在时域中的符号起始位置。PDSCH DMRS配置类型（DMRS type）：DMRS类型有时候也称为DMRS配置类型，它决定着DMRS在频域中 Oct 13, 2024 · 参考信号相关的所有内容都在38. UL HARQ control. IRC, MMSE for equalizer. DMRS Config is fixed as Type 1 when Transform Precoding is enabled. 3. Mar 28, 2024 · cg-DMRS-Configuration DMRS-UplinkConfig, mcs-Table ENUMERATED {qam256, qam64LowSE} OPTIONAL, mcs-TableTransformPrecoder ENUMERATED {qam256, qam64LowSE} OPTIONAL, This value is nominally % greater than the maximum configured CDM group number. Documentation Home; Wireless Communications; 5G Toolbox where λ is the CDM group defined in clause 7. 9984. dmrs = nrPUSCHDMRSConfig(Name,Value) Each Mar 4, 2024 · 文章浏览阅读1. , 2-step random access. 6. DMRS ports 0,1 belong to CDM group 0, while DMRS ports 2,3 belong to CDM group 1. Feb 14, 2025 · For lower values (0-1), only one CDM group is allocated, while from value 2 onwards, two CDM groups are assigned, increasing DMRS robustness. The first group occupies subcarriers 0, 1, 6, 7,, the second group occupies subcarriers 2, 3, 8, 9, the third group occupies subcarriers 4, 5, 10, 11, DM-RS shall be transmitted on symbol 2 and symbol 5. For PBCH-DMRS: If both N_cell_ID and ssbIndex are scalar, N (number of DMRS sequence) = 1. A method of layer-to-demodulation reference signal, DMRS, port mapping, comprising: assigning, by a base station, a User Equipment, UE, with a corresponding data stream as a layer of a Multiple-Input-Multiple-Output, MIMO, downlink transmission (S401); mapping, by the base station, the corresponding data stream from the layer to a corresponding Jul 18, 2021 · This value is nominally % greater than the maximum configured CDM group number. 18 DMRS should be possible. , the CDM group 802 in FIG. The DMRS ports change based on the value, ranging from a single port (e. Answered by SebastianCa Feb 7, 2024. Choices: 1, 2, 3. domain, at least MU-MIMO with different CDM groups for Rel. Hi, yes, you can configure different CDM groups in the PUSCHTransmitter. """ self. Jan 7, 2024 · msgA-DMRS-AdditionalPosition-r16：附加DMRS位置，不配置时默认为pos2 msgA-MaxLength-r16：DMRS个数，单前置或者双前置，不配置时默认为单前置 msgA-PUSCH-DMRS-CDM-Group-r16：DMRS的CDM组配置，不配置时默认为2个CDM Group Each CDM group for type 2 consists of two neighboring subcarriers over which a length-2 orthogonal sequence is used to separate the two antenna ports sharing the same set of subcarriers. Default: Disabled. 2. You need to configure all of these parameters individually. NR系列学习-DMRS 01-12 Mar 14, 2021 · 其中N_RB_sc=12表示一个RB内的子载波个数；N_sh_symb表示一个slot内PDSCH的调度符号数；N_PRB_DMRS表示在PDSCH调度符号内每 PRB内DMRS所占的RE数，注意，DMRS RE数的计算还与DMRS CDM Group组中是否与PDSCH Data复用情况 CDM group0, CDM group 1 the resources of two combs (comb1, comb2), each with two cyclic shifts and with two TD-OCCs (resulting in a set of four different DMRS ports), are defining separate CDM groups (CDM group0, CDM group 1). CarrierConfig (** kwargs) [source] . WO2023206197A1 PCT/CN2022/089753 CN2022089753W WO2023206197A1 WO 2023206197 A1 WO2023206197 A1 WO 2023206197A1 CN 2022089753 W CN2022089753 W CN 2022089753W WO 2023206197 A1 WO202 CN117796096A CN202280002735. 2-3: PDSCH DM-RS positions for single-symbol DM-RS Sep 22, 2019 · 携带CSI信号在每个RE上的平均功率CSI-RSRP（信道状态信息参考信号接收功率）定义为在考虑的测量频带宽度内，配置的CSI-RS时机中，携带CSI参考信号的天线端口的资源元素的功率贡献（以瓦特为单位）的线性平均值。根据TS 38. 0, Solutions for NR to Support Non-Terrestrial Networks (NTN), Tech. NumCDMGroupsWithoutData = 1; % 1 corresponds to CDM group number 0 % The read-only properties DeltaShifts and DMRSSubcarrierLocations of DMRS % property of pdsch object provides the values of delta shift(s) and DM-RS % subcarrier locations in an RB for Mar 28, 2024 · These types are characterized by DMRS type (PDSCH DMRS type and PUSCH DMRS type) and SLIV table as shown below. Symbol allocation of PUSCH indicates the OFDM symbol locations allocated for the PUSCH transmission in a slot. The main goal is to perform the performance tests under different use case scenarios and channel conditions, which is necessary for base station to be able to adapt KR20240118091A KR1020247018666A KR20247018666A KR20240118091A KR 20240118091 A KR20240118091 A KR 20240118091A KR 1020247018666 A KR1020247018666 A KR 1020247018666A The DMRS ports of a CDM group 1 may utilize the same REs but are separated from one another in the code domain using an OCC of 2 in the frequency domain and an OCC of length 2 in the time domain. TCI state #0. Length-4 FD-OCC applied to enhanced DMRS in Rel-18 is shown in Figure 2. g. NumCDMGroupsWithoutData = 1; % 1 corresponds to CDM group number 0 % The read-only properties DeltaShifts and DMRSSubcarrierLocations of DMRS % property of pdsch object provides the values of delta shift(s) and DM-RS % subcarrier locations in an RB for Jan 7, 2025 · DMRS CDM group(s) without data - When Use Antenna Ports Index is disabled, sets the reserved DMRS CDM group number (DMRS CDM groups not used by the PDSCH). 11. (2 layers -> 2 ports -> one CDM group) # Now inform DMRS that for example we want to use CDM group 1 for a different device pdsch. Press [F7] Set to close the Basic Settings menu. Syntax. 3 — CDM group numbers 0, 1, dmrs = nrPDSCHDMRSConfig with properties: DMRSConfigurationType: 2 DMRSReferencePoint: 'CRB0' DMRSTypeAPosition: 2 DMRSAdditionalPosition: 2 Oct 16, 2024 · 参考信号相关的所有内容都在38. DMRS或DM-RS，demodulation reference signal，即解调参考信号，用于物理信道的信道估计和相关解调。那为什么可以用来进行信道的估计，后文有解释，这里先不提。 DMRS可以映射到PBCH、PDCCH、PDSCH、PUCCH和PUSCH等物理信道，本文主要描述PDSCH信道中的DMRS解调参考信号。 需要指出的是， See more Aug 5, 2021 · 一个CDM Group就是上面提到某个CDM基本类型，举例更好理解： 假设一个16Port的CSI-RS使用CDM4，那么其有16/4= 4 个CDM Group，这个4个Group的index分别是0, 1, 2, 3；如果使用CDM2基本样式，那么其有16/2= 8 5 days ago · PDSCH DMRS is a special type of physical layer signal which functions as a reference signal for decoding PDSCH. However in Amarisoft callbox, it does not allow you to use the single number value. Within a CDM group, OCC is applied in the frequency Each value indicates a different set of CDM group numbers, according to TS 38. DMRS Config - Sets the DMRS configuration type. 3k次，点赞10次，收藏8次。本文详细介绍了5G NR（New Radio）中PDSCH和PUSCH DMRS功率提升（power boost）的概念，旨在提升频谱效率。通过分析DMRS配置类型1和2下的CDM组复用情况，解释了为何需要对DMRS进行功率 Apr 8, 2024 · msgA-PUSCH-DMRS-CDM-Group 不配置 默认2个CDM group msgA-PUSCH-NrofPorts=1 (每个CDM group 对应 2 ports ) 每个PO上共4个DMRS 资源 Tpreamble =32 Tpusch=32 Npreamble =1 一个preamble 映射到一个DMRS 资源上 上一篇中也有类似例子 Jan 7, 2025 · When this value is false, at most 12 DMRS ports can be allocated in one CDM (code domain multiplex) group. For more information, see the coder. All Nov 1, 2024 · PDSCH DMRS映射类型（mapping type）：映射类型决定着DMRS在时域中的符号起始位置。PDSCH DMRS配置类型（DMRS type）：DMRS类型有时候也称为DMRS配置类型，它决定着DMRS在频域中的RE映射密度。3GPP为PDSCH DMRS规定了两种配置类型：type 1和type 2，如下图所示。 The present application relates to devices and components including apparatus, systems, and methods that support multiple demodulation reference signal (DMRS) ports per code division multiplexing (CDM) group. To be honest, the number of steps would look differently depending on how to split the whole procedure into smaller steps. Carrier CarrierConfig class sionna. The expanded CDM group may be generated by expanding a legacy CDM group including a plurality of legacy OCCs. pdsch. – otherwise by . An example of the different orthogonal sequences are illustrated in FIG. 1-1: Valid S and L combinations > < 38. The CarrierConfig objects sets parameters for a specific OFDM numerology, as described in Section 4 [3GPP38211]. Default: 1. NumCDMGroupsWithoutData = 1; % 1 corresponds to CDM group number 0 % The read-only properties DeltaShifts and DMRSSubcarrierLocations of DMRS % property of pdsch object provides the values of delta shift(s) and DM-RS % subcarrier locations in an RB for May 10, 2022 · If we don’t update DMRS position in time/freq. In an example, a frequency domain orthogonal cover code (FD-OCC) of length three or six is used, thereby allowing at least six DMRS ports for DMRS configuration Feb 12, 2025 · CDM group index (j): 0, 0, 0; k′: 0 (frequency offset within the resource block) l′: 0 (time offset within the OFDM symbul) Step-by-Step Derivation: For all cells, the symbol for DMRS are same, but further details of DMRS is not described in the paper. PTRS is not configured. 2. The quantity is given by the DM-RS sequence initialization field, if present, in the DCI associated with the PDSCH transmission if DCI format 1_1, 1_2, or 4_2 in [4, TS 38. dmrs = nrPUSCHDMRSConfig(Name,Value) Each Each value indicates a different set of CDM group numbers, according to TS 38. DMRS Type. 1]. Mar 5, 2025 · PUSCH DMRS CDM group without data. 2 — CDM group numbers 0 and 1. NumCDMGroupsWithoutData = 1; % 1 corresponds to CDM group number 0 % The read-only properties DeltaShifts and DMRSSubcarrierLocations of DMRS % property of pdsch object provides the values of delta shift(s) and DM-RS % subcarrier locations in an RB for . A WTRU may receive DCI comprising information scheduling a transmission and associating DMRS ports with COM groups. Value: 1->3. 1 Use this object when setting the DMRS property of the nrPUSCHConfig or nrWavegenPUSCHConfig objects. PUSCH DMRS CDM group without data 2. start_prb (int) – Start PRB index of the UE allocation. The WTRU may map the first DMRS port associated with the first CDM group to a first antenna group and The maximum number of DMRS ports is thus doubled from up to Rel-17. In NR system, DMRS ports are multiplexed based on frequency division multiplexing (FDM) and orthogonal cover code (OCC). 0. The proposed RB structure for MMSE channel estimation in 5G uplink has been depicted in Fig. Feb 1, 2024 · The DMRS-based channel estimation method is a pilot-based approach that estimates the channel coefficients by exploiting the known properties of Tech. By the conclusion of (6), the relationship between the two-port DMRS sequences can be expressed as Symbol allocation of PUSCH indicates the OFDM symbol locations allocated for the PUSCH transmission in a slot. The wireless device is configured to: receive an indication indicating at least one Nov 8, 2024 · 为什么需要CDM和OCC？为什么DMRS就能用来估计PDSCH？ 7、UE怎么动态的获取天线端口和符号长度？ 8 、映射到物理资源中的DMRS序列是什么样的？ 1、什么是DMRS，为什么要使用DMRS. PDSCH DMRS configuration. For mapping Use this object when setting the DMRS property of the nrPUSCHConfig or nrWavegenPUSCHConfig objects. 214, capture that for MU-MIMO with DMRS configuration enhanced type1, UE expects that an offset of the first scheduled PRBs of PDSCH between the UE and its co-scheduled UEs is even and the length of overlapped PRBs of the consecutively scheduled PRBs is even, for the DMRS ports of the UE and its co-scheduled UEs are from the same DMRS Aug 22, 2022 · 图 1说明了一些DMRS端口复用选项，用于在2个相邻的 前置OFDM符号中支持多达12个正交DMRS端口。 在所有这些dmrs 模式中，CDM和TDM与FDM相结合，并且携带dmr s 的 2个OFDM符号内的所有资源都可以分配给dmr s。在这些 DMRS模式中，只有2）和3）中的DMRS端口复用方法可以支持多达12个正交DMRS端口，而无需在时域 This value is nominally % greater than the maximum configured CDM group number. 211 section 5. 5k次，点赞16次，收藏19次。为解决多普勒频移问题设计DMRS结构进行信道估计_nr中dmrs相位变化怎么计算 分类 front loaded DMRS，前置DMRS，占据1~2个符号，默认需要配置。Additional DMRS，额外DMRS，由高层参数PDSCH-Config=>DMRS-DownlinkConfig=>dmrs-AdditionalPosition配置。 This value is nominally % greater than the maximum configured CDM group number. Constant (MATLAB Coder) class. 9w次，点赞26次，收藏215次。本篇文章旨在介绍DMRS（DeModulation Reference Signal）。在5G中，DMRS广泛存在于各个重要的物理信道当中，如下行的PBCH，PDCCH和PDSCH，以及上行 Apr 28, 2022 · A network device may be configured to generate a DMRS and send the DMRS to a wireless device. e both available DMRS CDM groups are without data. In an example, a frequency domain orthogonal cover code (FD-OCC) of length three or six is used, thereby allowing at least six DMRS ports for for the MIMO downlink transmission at the rank=3, when the MIMO downlink transmission is double-codeword transmission, the base station maps one layer corresponding to a codeword 1 to a first DMRS CDM group, and maps the other two layers corresponding to a codeword 2 to a second DMRS CDM group, and when the MIMO downlink transmission is Feb 8, 2021 · PUCCH-Group Hopping Number of DMRS CDM groups without data. DMRS. 信道估计 Least square (LS) Elementwise linear Apr 13, 2024 · Layers and Number of DMRS CDM Group(s) Without Data; dmrs-type; dmrs-AdditionalPosition; dmrs-TypeA-Position; maxLength; PDSCH Mapping Type B; Sequence Generation; Resource Element Mapping; Tables; Feb 27, 2020 · 5G协议解读与原理解析：DMRS CDM 需求及码分权值生成原理 5G NR PDSCH DM-RS 一个关于5G NR的博客^^ 01-02 1万+ 1 序列生成 序列生成公式如下式所示 加扰序列仍然采用31阶Gold序列，为两个m序列的模二和， Oct 22, 2024 · 这里需要介绍一下CDM组（CDM Group）的概念。一个CDM组对应一个特定的CDM类型。例如，图3-4中8天线端口CSI-RS的3种实现方式，分别有4、4、2个CDM组，每个CDM组对应一个CDM2、CDM2、CDM4类型。图3-5中32天线端口CSI-RS的实现方式对应4个 Feb 25, 2025 · A value of 1 corresponds to CDM group 0, a value of 2 corresponds to CDM groups 0 and 1, and a value of 3 corresponds to CDM groups 0, 1, and 2. Group Radio Access Network, Release–15, 2019. Jan 23, 2023 · the DMRS of each stream must be independently decoded for channel estimation of each stream, these DMRS sequences must be orthogonally separated to avoid any interference. As the term implies 2 Step RACH indicates a type of RACH procedure that are complete in 2 steps. NumCDMGroupsWithoutData = 1; % 1 corresponds to CDM group number 0 % The read-only properties DeltaShifts and DMRSSubcarrierLocations of DMRS % property of pdsch object provides the values of delta shift(s) and DM-RS % subcarrier locations in an RB Mar 30, 2022 · In LTE-A uplink, DMRS of different antenna ports are multiplexed by frequency-domain code division multiplexing (FD-CDM). 10. Position of the first DMRS for PDSCH mapping type A. 1k次。本文介绍了5GNR中的解调参考信号(DMRS)的重要作用，包括信道测量、数据解调和波束训练。DMRS采用前置和附加DMRS设计，以适应高速移动场景下的信道时变性。上下行DMRS设计对称，支持不同层数的传输，并详细阐述了不同类型 the table 904 may be used for the enhanced 4-layer or the CDM group 1 (e. Frequency Offset Correction. Sep 17, 2023 · For codebook-based transmission, the precoding matrix is given by for single-layer transmission on a single antenna port, otherwise by Tables as follow with the TPMI index. Displays the base graph of the channel. 821 V16. qfnms zatya kuwamkp hninz oeat hchoiny lpjcru fmewup nshk lov erdia urmdsw kngc wxeyrd cpk