The average achievable rate of multi-antenna two-way relay networks with interference alignment

The large system analysis (LSA) has recently been shown to be a very useful tool for computing the average achievable rate. In this paper, we use LSA to derive the users' average achievable rate of multi-antenna two-way relay networks with interference alignment (IA), and we then derive the rate expressions under both equal power allocation and optimal power allocation. It is shown that the obtained closed-form rate expressions are functions of the average signal-to-noise ratio (SNR) for each data stream. Extensive simulation studies show that the average achievable rate expressions derived through LSA provide accurate estimates of the average achievable rate for two-way relay networks with interference alignment.