Dual‐hop amplify‐and‐forward cooperative relaying in the presence of Tx and Rx in‐phase and quadrature‐phase imbalance. Issue 3 (1st February 2014)

• Record Type: Journal Article
• Authors: Qi, Jian; Aissa, Sonia; Alouini, Mohamed‐Slim
• Is Part Of: IET communications. Volume 8:Issue 3(2014)
• Page Start: 287
• Page End: 298
• Publication Date: 2014-02-01
• Subjects: error statistics -- Rayleigh channels -- amplify and forward communication -- relay networks (telecommunication); dual‐hop amplify‐and‐forward cooperative relaying -- in‐phase and quadrature‐phase imbalance -- AF cooperative protocol -- I/Q imbalance -- opportunistic relay selection -- compensation mechanism -- symbol error probability -- Rayleigh fading environment -- channel state information; Telecommunication systems -- Periodicals; Speech processing systems -- Periodicals; 621.38205
• DOI: 10.1049/iet-com.2013.0287
• Languages: English
• ISSNs: 1751-8628

Abstract

Abstract : In this study, dual‐hop channel state information‐assisted amplify‐and‐forward (AF) cooperative systems in the presence of in‐phase and quadrature‐phase (I/Q) imbalance, which refers to the mismatch between components in the I and Q branches, are investigated. First, the authors analyse the performance of the considered AF cooperative protocol without compensation for the I/Q imbalance as the benchmark. Then, a compensation algorithm for the I/Q imbalance is proposed, which makes use of the received signals at the destination, from the source and the relay nodes, together with their conjugations to detect the transmitted signal. Moreover, the authors study the considered AF cooperative system implemented with the opportunistic relay selection and the proposed compensation mechanism for the I/Q imbalance. The performance of the AF cooperative system under study is evaluated in terms of average symbol error probability, which is derived by considering transmission in a Rayleigh fading environment. Numerical results are provided and show that the proposed compensation algorithm can efficiently mitigate the effect of the I/Q imbalance. On the other hand, it is observed that the AF cooperative system with opportunistic relay selection acquires a performance gain beyond that without relay selection.