MIMO Interference Alignment for Cognitive Radio Network
Though various cognitive radio schemes have been developed, they have not considered the problem of co-channel interference for cognitive users (CU) and primary user (PU)to share a OFDM channel, also well as MIMO-OFDM channel. This paper proposes a scheme that allows PU and CU share a same frequency band, while there are two problems to be solved: the interference of CU to PU, and interference of PU to CU. To solve the first problem, this paper proposes an ICA precoding scheme to cancel the interference of CU to PU, the precoding scheme involves the design of cognitive transmitters. To solve the second problem, this paper proposes CU receiver algorithm, we use inverse matrix to cancel the PU signal interference. The proposed scheme is not limited in the case that a MIMO-OFDM system of cognitive users in a wide spectrum range , and the primary user operates at a narrower channel bandwidth in overlap with the channel of the cognitive user. We designed an ICA CU system as a 2×2 MIMO OFDM system, while we need not change the PU systems’ design. The simulation of the bit error rate of proposed ICA CU system verifies the proposed scheme.
MIMO OFDM Cognitive Radio interference alignment and cancellation
Yuanfang Li Yang Xiao Moon Ho Lee
School of Computer and Information Technology, Beijing Jiaotong University, Beijing 100044, China Division of Electronics and Information Engineering, Chonbuk National University, Jeonju 561-756, Ko
国际会议
北京
英文
127-130
2011-11-27（万方平台首次上网日期，不代表论文的发表时间）