Interference Mitigation for Cognitive Radio MIMO Systems Based on Practical Precoding
Abstract
In this paper, we propose two subspace-projection-based precoding schemes, namely, full-projection (FP)- and partial-projection (PP)-based precoding, for a cognitive radio multiple-input multiple-output (CR-MIMO) network to mitigate its interference to a primary time-division-duplexing (TDD) system. The proposed precoding schemes are capable of estimating interference channels between CR and primary networks, and incorporating the interference from the primary to the CR system into CR precoding via a novel sensing approach. Then, the CR performance and resulting interference of the proposed precoding schemes are analyzed and evaluated. By fully projecting the CR transmission onto a null space of the interference channels, the FP-based precoding scheme can effectively avoid interfering the primary system with boosted CR throughput. While, the PP-based scheme is able to further improve the CR throughput by partially projecting its transmission onto the null space.
Cite
@article{arxiv.1104.4155,
title = {Interference Mitigation for Cognitive Radio MIMO Systems Based on Practical Precoding},
author = {Zengmao Chen and Cheng-Xiang Wang and Xuemin Hong and John Thompson and Sergiy A. Vorobyov and Feng Zhao and Hailin Xiao and Xiaohu Ge},
journal= {arXiv preprint arXiv:1104.4155},
year = {2016}
}
Comments
12 pages, 4 figures, submitted to the IEEE Trans. Wireless Communications in April 2011