|| Index Modulation Aided Massive MIMO Un-sourced Random Access
||Zijie Liang, Jianping Zheng, Jie Ni, Xidian University, China|
||D7-S6-T1: Topics in Index Modulation
||Tuesday, 20 July, 23:40 - 00:00
||Wednesday, 21 July, 00:00 - 00:20
In this paper, the massive multiple-input multiple output un-sourced random access (URA) is studied, and an index modulation (IM)-aided transmission scheme is proposed. The proposed URA-IM scheme is built on the conventional URA consisting of common inner compressed sensing (CS) code in all channel blocks and outer tree code across blocks. Different from conventional URA, URA-IM firstly partitions channel blocks of one transmission frame into multiple groups, and then employs the IM principle to activate only part of the channel blocks in each group. By URA-IM, the average number of active CS codewords in each channel block can be decreased, which will improve the performance of inner CS detector. Moreover, a modified tree decoder is proposed to take the IM signal property into account. Computer simulations show that the proposed URA-IM has better performance than conventional URA in terms of permitting shorter block length and servicing more active users in the scenario of 36-bit information transmission per user.