Opportunistic Multiuser Two-Way Amplify-and-Forward Relaying With a Multiantenna Relay
- Title
- Opportunistic Multiuser Two-Way Amplify-and-Forward Relaying With a Multiantenna Relay
- Author
- 남성식
- Keywords
- Amplify and forward (AF); degree of freedom (DoF); opportunistic user pair selection; two-way relaying
- Issue Date
- 2016-05
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Citation
- IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, v. 65, NO 5, Page. 3777-3782
- 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.
- URI
- https://ieeexplore.ieee.org/document/7120995/https://repository.hanyang.ac.kr/handle/20.500.11754/71560
- ISSN
- 0018-9545; 1939-9359
- DOI
- 10.1109/TVT.2015.2443114
- Appears in Collections:
- INDUSTRY-UNIVERSITY COOPERATION FOUNDATION[S](산학협력단) > ETC
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