Opportunistic Multiuser Two-Way Amplify-and-Forward Relaying With a Multiantenna Relay
- Authors
- Hwang, Duckdong; Clerckx, Bruno; Nam, Sung Sik; Lee, Tae-Jin
- Issue Date
- 5월-2016
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Amplify and forward (AF); degree of freedom (DoF); opportunistic user pair selection; two-way relaying
- Citation
- IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, v.65, no.5, pp.3777 - 3782
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
- Volume
- 65
- Number
- 5
- Start Page
- 3777
- End Page
- 3782
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/88754
- DOI
- 10.1109/TVT.2015.2443114
- ISSN
- 0018-9545
- Abstract
- We consider the opportunistic multiuser diversity in the multiuser two-way amplify-and-forward (AF) relay channel. The relay, which is equipped with multiple antennas and a simple zero-forcing beamforming (ZFBF) scheme, selects a set of two way relaying user pairs to enhance the degree of freedom (DoF) and, consequently, the sum throughput of the system. The proposed channel-aligned pair scheduling (CAPS) algorithm reduces the interpair interference and keeps the signal-to-interference-plus-noise-power ratio (SINR) of user pairs that are interference-free when the number of user pairs becomes very large. When the number of user pairs grows fast enough with the system signal-to-noise ratio (SNR), a DoF equal to the number of relay antennas can be achieved. For a realistic number of user pairs, we propose an adaptive CAPS and an adaptive semi-orthogonal CAPS (SCAPS) to improve performance. Simulation results show that adaptive CAPS and adaptive SCAPS provide throughput gain in the low-to-mid SNR region.
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