Relay-aided Space-Time Beamforming for Interference Relay Networks with Partial Channel Knowledge
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- Title
- Relay-aided Space-Time Beamforming for Interference Relay Networks with Partial Channel Knowledge
- Authors
- Shin, W; LEE, NAMYOON; Lee, J; Poor, HV
- Date Issued
- 2016-10-01
- Publisher
- IEEE
- Abstract
- This paper proposes a novel multiantenna relay-aided interference management technique that requires limited channel knowledge for interference relay channels, which is referred to as relay-aided space-time beamforming (r-STBF). Using the proposed method, it is shown that KM/K+M-1 multiplexing gain is achievable in a K-user multiple-input single-output (MISO) interference relay channel when the relay has M antennas with a certain type of limited channel knowledge. By leveraging this result, it is demonstrated that the interference-free multiplexing gain of K is asymptotically achievable as M approaches infinity. Furthermore, the proposed r-STBF method is shown to achieve the optimal multiplexing gain of KL/K+L-1 for a K x L single-input single-output (SISO) X channel with an M-antenna relay. One major implication of these results is that the use of a relay is beneficial in obtaining the optimal multiplexing gains for relay-aided interference networks even with limited channel knowledge, which bridges the theory-practice gap by implementing advanced interference management methods with less overhead for practical wireless systems.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/37737
- DOI
- 10.1109/TSP.2016.2591909
- ISSN
- 1053-587X
- Article Type
- Article
- Citation
- IEEE Transactions on Signal Processing, vol. 64, no. 19, page. 5119 - 5130, 2016-10-01
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