WO2022100027A1 - 一种高维非正交传输方法 - Google Patents

一种高维非正交传输方法 Download PDF

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WO2022100027A1
WO2022100027A1 PCT/CN2021/090967 CN2021090967W WO2022100027A1 WO 2022100027 A1 WO2022100027 A1 WO 2022100027A1 CN 2021090967 W CN2021090967 W CN 2021090967W WO 2022100027 A1 WO2022100027 A1 WO 2022100027A1
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precoding
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岳光荣
余代中
杨霖
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电子科技大学
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting

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  • the invention belongs to the field of communications, and specifically relates to a high-dimensional non-orthogonal transmission method.
  • NOMA Non-Orthogonal Multiple Access
  • UEs User Equipments
  • 3GPP considered different applications of NOMA.
  • SCMA Power Domain NOMA
  • SCMA Sparse Code Multiple Access
  • PDMA Modular Division Multiple Access
  • RSMA Resource Extended Multiple Access
  • OMA Orthogonal Multiple Access
  • OMA Orthogonal Multiple Access
  • the core challenges of the existing NOMA technology lie in the need for higher receiver complexity, user pairing and user coordination complexity, and the detection complexity increases rapidly as the number of UEs increases.
  • the present invention provides a high-dimensional non-orthogonal transmission method, which can realize non-orthogonal transmission of multi-user data without relying on user pairing and cooperation, and each user does not need iterative feedback, and only needs to use ordinary coherent transmission. Data recovery can be achieved upon reception, thereby greatly reducing the complexity of signal detection.
  • the invention discloses a high-dimensional non-orthogonal transmission method.
  • the method includes: a transmitter, multiple users, and multiple channel resources; the transmitter is used to process and transmit the original signals of the multiple users; The original signal is received and recovered; multiple channel resources include time domain, frequency domain, and space domain, which are used by transmitters and multiple users;
  • the described high-dimensional non-orthogonal transmission method comprises the following steps:
  • Step 1 The transmitter maps the original signal of the u-th user to the u-th high-dimensional original signal, and the u-th high-dimensional original signal is:
  • s 0 (u) represents the original signal of the u-th user
  • s(u) represents the u-th high-dimensional original signal
  • Step 2 The transmitter precodes the u-th high-dimensional original signal to generate the u-th high-dimensional transmitted signal.
  • the precoding process is:
  • x(u) represents the u-th high-dimensional transmission signal
  • x i (u) represents the i-th dimension of the u-th high-dimensional transmission signal
  • ⁇ i (u) represents the i-th dimension of the u-th precoded signal
  • Step 3 The transmitter sums all the uth high-dimensional transmitted signals to obtain the high-dimensional total transmitted signal:
  • U represents the number of users, Represents the high-dimensional total transmitted signal; the transmitter uses multiple channel resources to broadcast the high-dimensional total transmitted signal to all users, wherein one channel resource in the multiple channel resources is used to transmit one dimension of the high-dimensional total transmitted signal;
  • the i-th dimension of the u-th precoded signal in the step 2 is:
  • j represents the imaginary unit
  • L represents the number of precoding layers
  • m k represents the index of the precoding branch of the kth layer
  • the number of precoding layers k and the precoding branch index m k of the kth layer satisfy:
  • M k represents the number of precoding branches of the k-th layer
  • ⁇ f k represents the frequency offset of the k-th layer
  • T represents the offset period, and its value is :
  • gcd( ⁇ f 1 , ⁇ f 2 ,..., ⁇ f L ) represents the greatest common divisor of ⁇ f 1 , ⁇ f 2 ,..., ⁇ f L .
  • the present invention realizes non-orthogonal transmission in a higher dimension by mapping the signals of each user into high-dimensional signals and precoding the high-dimensional signals. At the same time, different users match and receive their respective signals, and only a receiver with linear complexity is needed to recover non-orthogonal transmission signals.
  • the method disclosed in the present invention can realize non-orthogonal transmission of multi-user data without relying on user pairing, cooperation and other conditions, and each user does not need iterative feedback, thereby greatly reducing the detection complexity of non-orthogonal multi-user signals.
  • Figure 1 shows the block diagram of the transmitter.
  • Figure 2 depicts the receiver block diagram of the uth user among the multiple users.
  • the transmitter adopts the system structure shown in Figure 1. First, the original signal of the uth user is mapped to the uth high-dimensional original signal, and the uth high-dimensional original signal is
  • the transmitter precodes the u-th high-dimensional original signal to generate the u-th high-dimensional transmitted signal.
  • the precoding process is as follows:
  • the u-th precoded signal is generated according to the generation structure shown in Figure 3, and the i-th dimension of the u-th precoded signal is
  • the uth user among the multiple users receives the high-dimensional total transmitted signal to obtain the high-dimensional total received signal
  • the high-dimensional total received signal is matched and received according to the u-th precoded signal, and the estimation of the u-th original signal is obtained.
  • the matching receiving process is
  • Figure 3 plots the multi-user communication bit error rate performance curve when 64 channel resources are used in this embodiment. It can be seen that the non-orthogonal transmission method provided by this embodiment can realize communication of more than 64 users, and this The detection method provided by the embodiment only needs to perform related superposition operations, does not require user pairing, collaboration and iterative feedback, and only has linear complexity.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
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Abstract

该发明公开了一种高维非正交传输方法，属于通信领域，具体涉及高维非正交传输方法。本发明通过将各个用户的信号映射为高维信号，并对高维信号进行预编码，从而在更高的维度上实现非正交传输。与此同时，不同的用户对各自的信号进行匹配接收，只需要线性复杂度的接收机即可恢复出非正交的传输信号。并且，本发明所公开的方法不依赖于用户配对、协同等条件即可实现多用户数据非正交传输，各个用户无需迭代反馈，从而大幅降低非正交多用户信号的检测复杂度。

Description

一种高维非正交传输方法 技术领域
该发明属于通信领域，具体涉及高维非正交传输方法。
背景技术
在过去几年里，非正交多址(NOMA)作为应用于LTE、5G和超5G的候选技术而备受关注，在NOMA中，多个用户设备(UE)实现协同，并且共享时域、频域和码域的信道资源。3GPP考虑了NOMA的不同应用。学术界与工业界也提出了各种不同的SCMA体制，例如功率域NOMA、稀疏码多址(SCMA)、模分多址(PDMA)、资源扩展多址(RSMA)等。经合理配置，NOMA可以相较于正交多址(OMA)获得更高的用户容量。但是，现有NOMA技术的核心挑战在于需要更高的接收机复杂度，用户配对以及用户协同复杂度，其检测复杂度随着UE的数目增加而快速增加。
发明内容
为解决上述问题，本发明提供了一种高维非正交传输方法，可以在不依赖于用户配对、协同的条件下实现多用户数据非正交传输，并且各个用户无需迭代反馈，只需采用普通相干接收即可实现数据恢复，从而大幅降低信号检测复杂度。
本发明公开一种高维非正交传输方法，该方法中包括：发射机、多个用户、多个信道资源，发射机用于对多个用户的原始信号进行处理和发送；多个用户对各自的原始信号进行接收和恢复；多个信道资源包括时域、频域、空域，供发射机和多个用户使用；
其特征在于，所述高维非正交传输方法，包括以下步骤：
步骤1：发射机将第u个用户的原始信号映射为第u高维原始信号，第u高维原始信号为：
Figure PCTCN2021090967-appb-000001
其中，s 0(u)表示第u个用户的原始信号，s(u)表示第u高维原始信号，s i(u)表示第u高维原始信号的第i维，其中i＝1,2,…,M，M表示第u高维原始信号的维度，其值等于信道资源的数目；
步骤2：发射机对第u高维原始信号进行预编码，产生第u高维发射信号，预编码过程为
Figure PCTCN2021090967-appb-000002
其中，x(u)表示第u高维发射信号，x i(u)表示第u高维发射信号的第i维，α i(u)表示第u预编码信号的第i维；
步骤3：发射机将所有第u高维发射信号求和得到高维总发射信号：
Figure PCTCN2021090967-appb-000003
其中，U表示用户的数目，
Figure PCTCN2021090967-appb-000004
表示高维总发射信号；发射机利用多个信道资源将高维总发射信号广播给所有的用户，其中多个信道资源中的1个信道资源被用于传输高维总发射信号的一维；
步骤4：第u个用户对高维总发射信号进行接收，得到高维总接收信号，并依据第u预编码信号对高维总接收信号进行匹配接收，得到第u原始信号的估计，其中u＝1,2,…,U；匹配接收过程为：
Figure PCTCN2021090967-appb-000005
Figure PCTCN2021090967-appb-000006
其中，
Figure PCTCN2021090967-appb-000007
表示第u原始信号的估计，
Figure PCTCN2021090967-appb-000008
表示第u预编码信号的第i维的共轭，
Figure PCTCN2021090967-appb-000009
表示高维总接收信号，
Figure PCTCN2021090967-appb-000010
表示高维总接收信号的第i维，i＝1,2,…,M。
进一步地，所述步骤2中第u预编码信号的第i维为：
Figure PCTCN2021090967-appb-000011
则第u预编码信号为：
Figure PCTCN2021090967-appb-000012
其中j表示虚数单位，L表示预编码层数，m k表示第k层预编码支路索引，预编码层数k、第k层预编码支路索引m k满足：
1≤m k≤M k
Figure PCTCN2021090967-appb-000013
Figure PCTCN2021090967-appb-000014
其中，M k表示第k层预编码支路数，Δf k表示第k层频率偏置量，其值在事先确定，其中k＝1,2,…L，T表示偏置周期，其值为：
Figure PCTCN2021090967-appb-000015
其中gcd(Δf 1,Δf 2,…,Δf L)表示Δf 1,Δf 2,…,Δf L的最大公约数。
本发明通过将各个用户的信号映射为高维信号，并对高维信号进行预编码，从而在更高的维度上实现非正交传输。与此同时，不同的用户对各自的信号进行匹配接收，只需要线性复杂度的接收机即可恢复出非正交的传输信号。并且，本发明所公开的方法不依赖于用户配对、协同等条件即可实现多用户数据非正交传输，并且各个用户无需迭代反馈，从而大幅降低非正交多用户信号的检测复杂度。
附图说明
图1绘制了发射机的结构框图。
图2绘制了多个用户中第u个用户的接收机框图。
图3采用64个信道资源时，多用户通信误码率性能曲线
具体实施方式
下面给出本发明的具体实施方式，在该实施方式中，假设用户数目为U＝80，并假设信道资源数目为64，其中信道资源在此处特指频域子载波。预编码层数L＝2，第1层预编码支路 数为M 1＝8，第二层预编码支路数为M 2＝8，第1层频率偏置量为Δf 1＝100kHz，第2层频率偏置量为Δf 2＝200kHz。发射机发射信号时按照以下步骤：
(1)发射机采用如图1所示系统结构，首先将第u个用户的原始信号映射为第u高维原始信号，第u高维原始信号为
Figure PCTCN2021090967-appb-000016
(2)发射机对第u高维原始信号进行预编码，产生第u高维发射信号，预编码过程为
Figure PCTCN2021090967-appb-000017
其中x(u)表示第u高维发射信号，第u预编码信号按照图3所示生成结构生成，第u预编码信号的第i维为
Figure PCTCN2021090967-appb-000018
Figure PCTCN2021090967-appb-000019
(3)多个用户中第u个用户的接收机采用图2所示的框图，发射机将所有第u高维发射信号求和得到高维总发射信号：
Figure PCTCN2021090967-appb-000020
多个用户中的第u个用户对高维总发射信号进行接收，得到高维总接收信号
Figure PCTCN2021090967-appb-000021
并依据第u预编码信号对高维总接收信号进行匹配接收，得到第u原始信号的估计。匹配接收过程为
Figure PCTCN2021090967-appb-000022
Figure PCTCN2021090967-appb-000023
其中
Figure PCTCN2021090967-appb-000024
表示第u原始信号的估计，
Figure PCTCN2021090967-appb-000025
表示第u预编码信号的第i维的共轭，其值为
Figure PCTCN2021090967-appb-000026
Figure PCTCN2021090967-appb-000027
图3绘制了本实施例用64个信道资源时，多用户通信误码率性能曲线，可以看到，采用本实施例提供的非正交传输方法，可以实现超过64个用户的通信，并且本实施例提供的检测方法只用进行相关叠加操作，无需用户配对、协同与迭代反馈，仅具有线性复杂度。

Claims (2)

  1. 一种高维非正交传输方法，该方法中包括：发射机、多个用户、多个信道资源，发射机用于对多个用户的原始信号进行处理和发送；多个用户对各自的原始信号进行接收和恢复；多个信道资源包括时域、频域、空域，供发射机和多个用户使用；
    其特征在于，所述高维非正交传输方法，包括以下步骤：
    步骤1：发射机将第u个用户的原始信号映射为第u高维原始信号，第u高维原始信号为：
    Figure PCTCN2021090967-appb-100001
    其中，s 0(u)表示第u个用户的原始信号，s(u)表示第u高维原始信号，s i(u)表示第u高维原始信号的第i维，其中i＝1,2,…,M，M表示第u高维原始信号的维度，其值等于信道资源的数目；
    步骤2：发射机对第u高维原始信号进行预编码，产生第u高维发射信号，预编码过程为
    Figure PCTCN2021090967-appb-100002
    其中，x(u)表示第u高维发射信号，x i(u)表示第u高维发射信号的第i维，α i(u)表示第u预编码信号的第i维；
    步骤3：发射机将所有第u高维发射信号求和得到高维总发射信号：
    Figure PCTCN2021090967-appb-100003
    其中，U表示用户的数目，
    Figure PCTCN2021090967-appb-100004
    表示高维总发射信号；发射机利用多个信道资源将高维总发射信号广播给所有的用户，其中多个信道资源中的1个信道资源被用于传输高维总发射信号的一维；
    步骤4：第u个用户对高维总发射信号进行接收，得到高维总接收信号，并依据第u预编码信号对高维总接收信号进行匹配接收，得到第u原始信号的估计，其中u＝1,2,…,U；匹配接收过程为：
    Figure PCTCN2021090967-appb-100005
    Figure PCTCN2021090967-appb-100006
    其中，
    Figure PCTCN2021090967-appb-100007
    表示第u原始信号的估计，
    Figure PCTCN2021090967-appb-100008
    表示第u预编码信号的第i维的共轭，
    Figure PCTCN2021090967-appb-100009
    表示高维总接收信号，
    Figure PCTCN2021090967-appb-100010
    表示高维总接收信号的第i维，i＝1,2,…,M。
  2. 如权利要求1所述的一种高维非正交传输方法，其特征在于，所述步骤2中第u预编码信号的第i维为：
    Figure PCTCN2021090967-appb-100011
    则第u预编码信号为：
    Figure PCTCN2021090967-appb-100012
    其中j表示虚数单位，L表示预编码层数，m k表示第k层预编码支路索引，预编码层数k、第k层预编码支路索引m k满足：
    1≤m k≤M k
    Figure PCTCN2021090967-appb-100013
    Figure PCTCN2021090967-appb-100014
    其中，M k表示第k层预编码支路数，Δf k表示第k层频率偏置量，其值在事先确定，其中k＝1,2,…L，T表示偏置周期，其值为：
    Figure PCTCN2021090967-appb-100015
    其中gcd(Δf 1,Δf 2,…,Δf L)表示Δf 1,Δf 2,…,Δf L的最大公约数。
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