Title :
The modified Cramer-Rao bound for channel estimation in quantize-and-forward cooperative systems
Author :
Avram, Iancu ; Moeneclaey, Marc
Author_Institution :
Dept. of Telecommun. & Inf. Process., Ghent Univ., Gent, Belgium
Abstract :
The quantize-and-forward (QF) cooperative protocol can effectively be used to combat fading in systems using half-duplex relay terminals. While the outage behavior of the QF protocol has been extensively investigated, few research has been performed on the impact of imperfect channel estimates. In this contribution, a lower bound (LB) on the estimation error is obtained for a one-hop relaying channel with data quantization at the relay. To this purpose the modified Cramer-Rao (MCRB) bound is calculated, which, compared to the true Cramer-Rao bound (CRB), is a looser and computationally less complex bound that converges to the CRB in the high signal-to-noise ratios. By using a general system model for the relay channel, the obtained results can be utilized to benchmark a wide variety of systems.
Keywords :
channel estimation; cooperative communication; fading channels; protocols; quantisation (signal); relay networks (telecommunication); LB; MCRB; QF; combat fading; data quantization; general system model; half-duplex relay channel terminal; imperfect channel estimation error; lower bound; modified Cramer-Rao bound; one-hop relaying channel; quantize-and-forward cooperative protocol system; signal-to-noise ratio; Channel estimation; Cramer-Rao bounds; Fading; Quantization (signal); Relays; Signal to noise ratio; Cooperative communication; Cramer-Rao Bound; Estimation; Quantize-and-Forward;
Conference_Titel :
Wireless Communications and Networking Conference (WCNC), 2013 IEEE
Conference_Location :
Shanghai
Print_ISBN :
978-1-4673-5938-2
Electronic_ISBN :
1525-3511
DOI :
10.1109/WCNC.2013.6555015
