Title :
EM-based joint time delay and channel estimation for cooperative communications
Author :
Ak, Serkan ; Odabasioglu, Niyazi ; Uysal, Murat
Author_Institution :
Dept. of Electr. & Electron. Eng., Istanbul Univ., Istanbul, Turkey
Abstract :
In this paper, we study joint time delay and channel estimation for a cooperative communication system with amplify-and-forward (AF) relaying. The proposed joint estimator is based on Expectation-Maximization (EM) algorithm and presents a low-complexity solution for iterative maximum likelihood (ML) estimation. Our simulation results demonstrate that the performance of proposed cooperative system lies within 0.5dB of the genie bound (i.e., perfect knowledge of time delays and fading coefficients) at a target bit error rate of 10-4 assuming the deployment of 4 pilot symbols and 3 iterations.
Keywords :
amplify and forward communication; channel estimation; cooperative communication; delays; error statistics; expectation-maximisation algorithm; iterative methods; EM-based joint time delay; amplify-and-forward relaying; channel estimation; cooperative communication system; expectation-maximization algorithm; iterative maximum likelihood estimation; joint estimator; low complexity solution; pilot symbol; target bit error rate; Bit error rate; Channel estimation; Delay effects; Fading; Joints; Relays; Timing; Channel estimation; cooperative communications; expectation-maximization algorithm; time synchronization;
Conference_Titel :
Wireless Communication Systems (ISWCS), 2011 8th International Symposium on
Conference_Location :
Aachen
Print_ISBN :
978-1-61284-403-9
Electronic_ISBN :
2154-0217
DOI :
10.1109/ISWCS.2011.6125316
