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}1/4{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}1/4{K+L-1} for a K × 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.
Original language | English (US) |
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Article number | 7514925 |
Pages (from-to) | 5119-5130 |
Number of pages | 12 |
Journal | IEEE Transactions on Signal Processing |
Volume | 64 |
Issue number | 19 |
DOIs | |
State | Published - Oct 1 2016 |
All Science Journal Classification (ASJC) codes
- Signal Processing
- Electrical and Electronic Engineering
Keywords
- Multiplexing gain
- X channel
- interference alignment
- interference channel
- relay