EM-Based Semi-Blind Channel Estimation in Amplify-and-Forward Two-Way Relay Networks

Author

Abdallah, Saeed ; Psaromiligkos, Ioannis N.

Author_Institution

Dept. of Electr. & Comput. Eng., McGill Univ., Montreal, QC, Canada

Volume

2

Issue

5

fYear

2013

fDate

Oct-13

Firstpage

527

Lastpage

530

Abstract

In this letter, we propose an expectation maximization (EM)-based algorithm for semi-blind channel estimation of reciprocal channels in amplify-and-forward (AF) two-way relay networks (TWRNs). By utilizing data samples as well as pilots, the proposed algorithm provides substantially higher estimation accuracy than the conventional training-based least squares (LS) estimator without incurring a significant computational cost. Simulation results also show that it performs very close to the corresponding semi-blind Cramer-Rao bound.

Keywords

amplify and forward communication; channel estimation; expectation-maximisation algorithm; EM-based semiblind channel estimation; TWRN; amplify and forward two way relay networks; expectation maximization based algorithm; reciprocal channels; semiblind Cramer-Rao bound; training based least squares estimator; Channel estimation; Estimation; Modulation; Relays; Signal to noise ratio; Throughput; Vectors; Amplify and forward; expectation maximization; semi-blind channel estimation; two-way relays;

fLanguage

English

Journal_Title

Wireless Communications Letters, IEEE

Publisher

ieee

ISSN

2162-2337

Type

jour

DOI

10.1109/WCL.2013.070113.130406

Filename

6560011