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. To minimize 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.
| Original language | English |
|---|---|
| Article number | 6942267 |
| Pages (from-to) | 4019-4030 |
| Number of pages | 12 |
| Journal | IEEE Transactions on Vehicular Technology |
| Volume | 64 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - 2015 Sept 1 |
Bibliographical note
Publisher Copyright:© 2014 IEEE.
Keywords
- Two-cell interfering multiple-input multipleoutput multiple access channel
- feedback bits allocation
- interference alignment
- limited feedback
- matrix quantization
ASJC Scopus subject areas
- Automotive Engineering
- Aerospace Engineering
- Electrical and Electronic Engineering
- Applied Mathematics