|| Massive MIMO Un-Sourced Random Access with Dynamic User Activity
||Jie Ni, Jianping Zheng, Zijie Liang, Xidian University, China|
||D7-S2-T1: Massive Access
||Tuesday, 20 July, 22:20 - 22:40
||Tuesday, 20 July, 22:40 - 23:00
In this paper, the massive multiple-input multiple-output un-sourced random access (URA) with dynamic user activity (DUA) is studied. The transmission frame consists of multiple blocks, and here DUA means that active users are block synchronous other than frame synchronous, i.e., the user activity is dynamic in different blocks of the same frame. To implement the URA with DUA, a multiple-codebook-aided concatenated scheme consisted of outer tree code and inner compressed sensing (CS) code is proposed. Concretely, four CS codebooks with same size are employed in inner CS code design to adapt to five typical transmit patterns in URA with DUA. Moreover, a modified tree decoding is presented to stitch the transmit information sequences of dynamic users. Finally, computer simulations are given to demonstrate the effectiveness of the proposed scheme.