Limited Feedback Design for Interference Alignment on Two-Cell Interfering MIMO-MAC
- Authors
- Kim, Myeong-Jin; Lee, Hyun-Ho; Ko, Young-Chai
- Issue Date
- 9월-2015
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Feedback bits allocation; interference alignment (IA); limited feedback; matrix quantization; two-cell interfering multiple-input-multiple-output multiple-access channel (MIMO-MAC)
- Citation
- IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, v.64, no.9, pp.4019 - 4030
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
- Volume
- 64
- Number
- 9
- Start Page
- 4019
- End Page
- 4030
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/92543
- DOI
- 10.1109/TVT.2014.2366470
- ISSN
- 0018-9545
- Abstract
- 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.
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