Impact of Channel Estimation Error on the Performance of Amplify-and-Forward Two-Way Relaying

• Published in: IEEE transactions on vehicular technology Vol. 61; no. 3; pp. 1197 - 1207
• Main Authors: Chenyuan Wang, Liu, T. C.-K, Xiaodai Dong
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.03.2012; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Access methods and protocols, osi model; Allocations; Amplification; Analog network coding (ANC); Applied sciences; Asymptotic properties; Bit error rate; bit error rate (BER); Cancellation; Channel estimation; channel estimation error; Channels; Convertors; Detection, estimation, filtering, equalization, prediction; Diversity reception; Electrical engineering. Electrical power engineering; Electrical machines; Estimation error; Exact sciences and technology; Information, signal and communications theory; outage probability; Outages; power allocation (PA); Relay; relay selection (RS); Relays; Signal and communications theory; Signal to noise ratio; Signal, noise; Statistics; Studies; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Teleprocessing networks. Isdn; Transmission and modulation (techniques and equipments); two-way relay network (TWRN); Performance evaluation; Relaying; Parameter estimation; Relay; Relay network; Analog network coding (ANC); Current source converter; Error estimation; Noise reduction; Bit error rate; Power system stability; Power allocation; Adaptive method; outage probability; Channel estimation; relay selection (RS); Selection criterion; Routing protocols; Signal detection; two-way relay network (TWRN); Estimation error; Packet switching; Outage; Transmission protocol; power allocation (PA); bit error rate (BER); channel estimation error; Interference suppression; Diversity combining; Noisy channel; Signal processing; Network coding; Numerical simulation; Signal to noise ratio
• ISSN: 0018-9545; 1939-9359
• DOI: 10.1109/TVT.2012.2185964

In this paper, the impact of channel-state information (CSI) estimation error on the performance of an amplify-and-forward two-way multiple relay network has been investigated. In contrast to the existing literature, which assumes perfect self-interference cancellation, we consider imperfect self-interference cancellation at both sources that exchange information through multiple relays, and maximal-ratio combining is then applied to improve the decision statistics under imperfect signal detection. We derive the effective signal-to-noise ratio (SNR) subject to noisy channel estimation, and based on this SNR, the system outage probability is given. In addition, we derive the closed-form expression of the average system bit error rate (BER) and the asymptotic expressions for both outage probability and BER. Furthermore, instead of employing all relays, we examine the impact of imperfect CSI on a single relay selection (RS) scheme. To mitigate the negative impact of imperfect CSI, we show that power allocation (PA), by minimizing either the outage probability or the BER, can suitably be cast as the geometric-programming problem. Numerical results validate the correctness of the derived expressions and show that the adaptive-PA scheme outperforms the equal-PA scheme under the aggregated effect of imperfect CSI.