Optimal zero-forcing design of precoders and decoders for multiuser cooperative networks

In this work, we proposed a multiuser relaying strategy for a cooperative network with multiple sources sharing the radio resource provided by the cooperative relays simultaneously. Different from the existing work, the set of relays forwards signals of all source users over a common channel to enhance spectral efficiency. With full channel information available at relays, the set of sub-optimal precoders and decoders was proposed in terms of average SNR of all users, subject to eliminating the multiple access interference (MAI) at each destination and satisfying total power constraint among all relays. It shows from the simulation results that, compared with the conventional cooperative strategy and direct transmission, the proposed scheme provides pronounced improvement on the outage capacity.