期刊
IEEE TRANSACTIONS ON COMMUNICATIONS
卷 70, 期 4, 页码 2435-2450出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCOMM.2022.3148430
关键词
Relays; Resource management; MIMO communication; Switches; Receivers; Optimization; Hybrid power systems; Full-duplex; achievable rate; power allocation; hybrid duplex scheme
资金
- National Natural Science Foundation of China [61901066, 61971077]
- Natural Science Foundation of Chongqing, China [cstc2019jcyj-msxmX0575]
- State Key Laboratory of Integrated Services Networks (Xidian University) [ISN22-17]
- National Research Foundation, Singapore
- Infocomm Media Development Authority under its Future Communications Research & Development Programme
This article proposes a novel hybrid duplex scheme with great potential in improving the spectral efficiency. By mitigating the self-interference in FD systems, the performance can be enhanced. The scheme is then applied to two-hop relaying systems, and by optimizing the FD duty cycle and source power allocation, the achievable rate can be significantly improved.
Full-duplex (FD) mode has great potential in improving the spectral efficiency. Mitigating the effect of self-interference becomes one key for performance enhancement of FD system. This work proposes a novel hybrid duplex scheme where the relay receives information for a fraction of time and simultaneously transmits and receives information for the rest, following a duty cycle. First, we formulate the achievable rate maximization of the proposed scheme as a joint FD duty cycle and source power allocation optimization problem. The optimal FD duty cycle, the optimal source power allocation, and the maximal achievable rate are explicitly given for some cases and characterized in detail for other cases. Then, the proposed scheme is applied to two-hop relaying systems. Specifically, the optimal source power allocation is proved to be a water-filling solution over the FD phase and the receives-only phase on the source-relay link. By dividing the system as low-, medium-, and high-source power cases, the optimal FD duty cycle and the maximal achievable rate are obtained in (approximate) closed-form case-by-case, where the source power thresholds among cases are clearly expressed. Numerical results validate that the proposed hybrid duplex scheme outperforms other benchmark schemes and can improve the achievable rate significantly.
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