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24 April 2024 |
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Article overview
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Max-min Fairness of K-user Cooperative Rate-Splitting in MISO Broadcast Channel with User Relaying | | Yijie Mao
; Bruno Clerckx
; Jian Zhang
; Victor O.K. Li
; Mohammed Arafah
; | | Date: |
17 Oct 2019 | | Abstract: | Cooperative Rate-Splitting (CRS) strategy, relying on linearly precoded
rate-splitting at the transmitter and opportunistic transmission of the common
message by the relaying user, has recently been shown to outperform typical
Non-cooperative Rate-Splitting (NRS), Cooperative Non-Orthogonal Multiple
Access (C-NOMA) and Space Division Multiple Access (SDMA) in a two-user
Multiple Input Single Output (MISO) Broadcast Channel (BC) with user relaying.
In this work, the existing two-user CRS transmission strategy is generalized to
the K-user case. We study the problem of jointly optimizing the precoders,
message split, time slot allocation, and relaying user scheduling with the
objective of maximizing the minimum rate among users. An efficient
self-organizing relaying protocol is first proposed followed by a Successive
Convex Approximation (SCA)-based algorithm to jointly optimize time slot,
precoders and message split. Numerical results show that the worst-case
achievable rate achieved by CRS is significantly increased over that of NRS and
SDMA in a wide range of network loads and user deployments. Importantly, the
proposed SCA-based algorithm dramatically reduces the computational complexity
without any rate loss compared with the conventional algorithm in the
literature of CRS. Therefore, we conclude that the proposed K-user CRS is more
powerful than the existing transmission schemes. | | Source: | arXiv, 1910.7843 | | Services: | Forum | Review | PDF | Favorites | |
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