Information Theory (cs.IT)
Tue, 08 Aug 2023
1.Low-complexity Resource Allocation for User Paired RSMA in Future 6G Wireless Networks
Authors:Jiewen Hu, Gang Liu, Zheng Ma, Ming Xiao, Pingzhi Fan
Abstract: Rate-splitting multiple access (RSMA) uplink requires optimization of decoding order and power allocation, while decoding order is a discrete variable, and it is very complex to find the optimal decoding order if the number of users is large enough. This letter proposes a low-complexity user pairing-based resource allocation algorithm with the objective of minimizing the maximum latency, which significantly reduces the computational complexity and also achieves similar performance to unpaired uplink RSMA. A closed-form expression for power and bandwidth allocation is first derived, and then a bisection method is used to determine the optimal resource allocation. Finally, the proposed algorithm is compared with unpaired RSMA, paired NOMA and unpaired NOMA. The results demonstrate the effectiveness of the proposed algorithm.