Link Adaptation of Two-Way AF Relaying Network with Channel Estimation Error over Nakagami-m Fading Channel

Kyu-Sung HWANG  Chang Kyung SUNG  

IEICE TRANSACTIONS on Communications   Vol.E102-B   No.3   pp.581-591
Publication Date: 2019/03/01
Publicized: 2018/09/14
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2018EBP3089
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
two-way relaying network,  Nakagami-m fading,  adaptive modulation,  channel estimation errors,  

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In this paper, we analyze the impact of channel estimation errors in an amplify-and-forward (AF)-based two-way relaying network (TWRN) where adaptive modulation (AM) is employed in individual relaying path. In particular, the performance degradation caused by channel estimation error is investigated over Nakagami-m fading channels. We first derive an end-to-end signal-to-noise ratio (SNR), a cumulative distribution function, and a probability density function in the presence of channel estimation error for the AF-based TWRN with adaptive modulation (TWRN-AM). By utilizing the derived SNR statistics, we present accurate expressions of the average spectral efficiency and bit error rates with an outage-constraint in which transmission does not take place during outage events of bidirectional communications. Based on our derived analytical results, an optimal power allocation scheme for TWRN-AM is proposed to improve the average spectral efficiency by minimizing system outages.