Title :
Iterative Channel Estimation and Data Detection for Amplify-and-Forward Relay Networks
Author :
Zhang, Yi ; Khalighi, Mohammad-Ali ; Bourennane, Salah
Author_Institution :
Inst. Fresnel, Ecole Centrale Marseille, Marseille, France
fDate :
5/1/2012 12:00:00 AM
Abstract :
We consider channel estimation in amplify-and-forward wireless relay networks when non-orthogonal coherent distributed space-time coding is done at relays. We propose to perform iterative channel estimation and data detection based on parallel interference cancelation (PIC) at the receiver. The schemes that we propose are based on soft or hard estimates of the transmitted data symbols. We illustrate the performance improvement compared to the classical approach of pilot-only-based channel estimation and minimum mean-square-error detection. Also, we show that semi-blind channel estimation together with PIC detection is particularly promising for large signal constellations. Moreover, we show that the use of hard estimates of symbols in the proposed iterative receiver provides satisfying results, while requiring a lower computational complexity.
Keywords :
amplify and forward communication; channel estimation; iterative methods; space-time codes; amplify-and-forward wireless relay networks; computational complexity; data detection; iterative channel estimation; iterative receiver; minimum mean square error detection; nonorthogonal coherent distributed space time coding; parallel interference cancelation; pilot-only-based channel estimation; semiblind channel estimation; signal constellation; transmitted data symbol; Channel estimation; Detectors; Phase shift keying; Receivers; Relays; Wireless sensor networks; Wireless relay networks; distributed diversity; iterative processing; semi-blind channel estimation;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2012.031912.120411