Limited Feedback Design for Interference Alignment on Two-Cell Interfering MIMO-MAC

作者：Kim Myeong Jin^*; Lee Hyun Ho; Ko Young Chai

来源：IEEE Transactions on Vehicular Technology, 2015, 64(9): 4019-4030.

DOI：10.1109/TVT.2014.2366470

• Feedback bits allocation
• interference alignment (IA)
• limited feedback
• matrix quantization
• two-cell interfering multiple-input-multiple-output multiple-access channel (MIMO-MAC)

This paper considers limited feedback for a two-cell interfering multiple-input-multiple-output multiple-access channel (MIMO-MAC). We propose a QR decomposition-based interference alignment (QRD-IA) scheme for efficient limited feedback and investigate the conditions for the antenna configuration. We characterize the interference leakage caused by quantization error as a function of the number of feedback bits. Tominimize the interference leakage, we further propose a quantized-precoder-based IA (QP-IA) scheme by modifying the proposed QRD-IA scheme. By characterizing the interference leakage of the QP-IA scheme, we investigate the number of feedback bits to maintain the degrees of freedom (DOFs) in the two-cell interfering MIMO-MAC and a feedback bit allocation algorithm to improve the sum rate. From simulation results, we demonstrate that our proposed schemes can provide better sum-rate performance than the existing scheme using the same number of feedback bits, and our feedback bit allocation algorithm provides a higher sum rate compared with equal feedback bit allocation.

• 出版日期2015-9