Relaying is a promising technique to extend coverage and improve throughput in wireless networks, but its performance is degraded in the presence of co-channel interference. In this paper, we consider coordinated relay beamforming to suppress interference and improve the date rates of two-hop interference networks. We first propose optimal coordinated relay beamforming algorithms to characterize the achievable rate region and maximize the sum-rate. By imposing a constraint on the desired signals, a low-complexity iterative algorithm is then proposed to maximize the sum-rate. Through performance comparison, we show that the proposed relaying strategy provides a promising tradeoff between complexity and performance. To further reduce design complexity, we propose a new interference management scheme, interference neutralization, to cancel the interferences over the air at the second hop. We show that this scheme yields a closed-form solution for the beamforming design and provides good performance especially at high signal-to-noise ratio (SNR).
Raymond H. Y. LouieYonghui LiHimal A. SuraweeraBranka Vucetic
Raymond H. Y. LouieYonghui LiBranka Vucetic
Ala GouissemLutfi SamaraRidha HamilaNaofal Al‐DhahirSebti Foufou
Hoc PhanTrung Q. DuongMaged ElkashlanHans‐Jürgen Zepernick
Raymond H. Y. LouieYonghui LiHimal A. SuraweeraBranka Vucetic