A new limited feedback scheme for interference alignment in two-cell interfering MIMO-MAC

In this paper, we propose a new interference alignment scheme with limited feedback for the two-cell interfering multi-user multiple-input multiple-output multiple access channel (MIMO-MAC), which provides better performance compared with other schemes when the number of feedback bits is same. Then, we analyse the rate loss for the quantization error, and show that the rate loss is only impacted by the residual inter-cell interference. By characterizing the rate loss as a function of the number of feedback bits, a bits allocation algorithm is introduced to further improve the system throughput. Monte-Carlo simulations illustrate that our proposed scheme outperforms the existing schemes.