Optimized MIMO relaying in random linear coded multiple-access relay network

We design a multiple-access relay network with multiple sources and relays via network coded cooperation where the radio resources in three dimensions: time, space and user are jointly optimized. For this, we derive the decoding error probability of two MIMO modes and develop an optimal MIMO mode selection and power allocation strategy for multiple sources and relays, so as to minimize the decoding error probability. Numerical results show that the optimal MIMO mode selection and power allocation strategy provides a significant gain of 25dB in SNR, and this SNR gain increases as the number of relays increases.