ODMA Transmission and Joint Pattern and Data Recovery for Unsourced Multiple Access
ODMA Transmission and Joint Pattern and Data Recovery for Unsourced Multiple Access
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DOI：
10.1109/lwc.2023.3268306
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发表时间：
2023-07
影响因子：
6.3
通讯作者：
Jianxiang Yan;Guanghui Song;Ying Li;Junqing Wang
中科院分区：
文献类型：
--
作者：
Jianxiang Yan;Guanghui Song;Ying Li;Junqing Wang
针对无源多址接入网络，提出了一种开-关分多址接入（ODMA）传输方案。将每个激活用户的消息分为两部分，其中第一部分用于确定开关模式，第二部分根据开关模式以跳时方式编码和发送。利用ODMA的超稀疏特性，在不需要导频的情况下，从接收信号中盲检测用户的开关模式，并在一个稀疏图上迭代执行开关模式检测和数据解码，以提高系统的可靠性。数值结果表明，在规则的重复累积（RA）编码下，当用户数达到350时，该方案与随机编码界之间的差距小于2 dB。
An on-off division multiple access (ODMA) transmission scheme is proposed for unsourced multiple access network. The message of each active user is divided into two parts, where the first part is used to determine an on-off pattern, and the second part is encoded and transmitted in a time-hopping manner according to the on-off pattern. Leveraging the super sparse property of ODMA, the users’ on-off patterns are blindly detected from the received signal without the help of pilot, and the on-off pattern detection and data decoding are performed iteratively over one sparse graph to enhance the overall system reliablity. Numerical result shows that with a regular repeat-accumulate (RA) encoding, the gap between the proposed scheme and the random coding bound is less than 2 dB for up to 350 active users.