We consider a multiple-antenna amplify-and-forward (AF) two-hop interference network with multiple links and multiple relays. Transmit precoders, receive decoders and relay AF matrices are optimized with the purpose to maximize the system sum rate. By pointing out that the existing models all lead to single data stream transmission for each user, we propose a novel multiple stream model. We maximize the Total Signal to Total Interference plus Noise Ratio (TSTINR), with the requirement of orthogonal columns of precoders and total relay transmit power constraint. An efficient algorithm is proposed to solve the corresponding problem. Simulations show that the system sum rate significantly benefits from multiple data streams in medium to high SNR scenarios.
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