Performance Analysis of Two-Way Relaying Network with Adaptive Modulation in the Presence of Imperfect Channel Information

Kyu-Sung HWANG  MinChul JU  

IEICE TRANSACTIONS on Communications   Vol.E99-B   No.5   pp.1170-1179
Publication Date: 2016/05/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2015EBP3173
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
two-way relaying network,  relay selection,  amplify-and-forward,  adaptive modulation,  outage channel state information,  channel estimation errors,  performance analysis,  

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In this paper, we study the impact of imperfect channel information on an amplify-and-forward (AF)-based two-way relaying network (TWRN) with adaptive modulation which consists of two end-terminals and multiple relays. Specifically, we consider a single-relay selection scheme of the TWRN in the presence of outdated channel state information (CSI) and channel estimation errors. First, we choose the best relay based on outdated CSI, and perform adaptive modulation on both relaying paths with channel estimation errors. Then, we discuss the impact of the outdated CSI on the statistics of the signal-to-noise ratio (SNR) per hop. In addition, we formulate the end-to-end SNRs with channel estimation errors and offer statistic analyses in the presence of both the outdated CSI and channel estimation errors. Finally, we provide the performance analyses of the proposed TWRN with adaptive modulation in terms of average spectral efficiency, average bit error rate, and outage probability. Numerical examples are given to verify our obtained analytical results for various system conditions.