Title :
Optimal training design and placement for channel estimation in cooperative networks
Author :
Mavrokefalidis, Christos ; Rontogiannis, Athanasios A. ; Berberidis, Kostas
Author_Institution :
Dept. of Comput. Eng. & Inf., Univ. of Patras, Rion, Greece
Abstract :
In this paper, optimal training design and placement are studied for channel estimation in a frequency selective, single relay, amplify and forward cooperative system. Using a two-phase transmission protocol, the power distribution between the phases, among the pilot tones as well as the positioning of pilot tones within the transmitted OFDM symbols are examined. The LMMSE and two variants of the LS estimator are analyzed and the optimal training design and placement strategies are derived. Closed-form expressions are derived for the minimum achievable MSE in each case, which are precisely verified through simulations.
Keywords :
OFDM modulation; amplify and forward communication; channel estimation; cooperative communication; least mean squares methods; protocols; LMMSE; OFDM; amplify and forward cooperative system. transmission protocol; channel estimation; cooperative network; frequency selective cooperative system; least square estimator; optimal training design; placement strategy; power distribution; single relay cooperative system; Channel estimation; Covariance matrix; Estimation; OFDM; Relays; Stochastic processes; Training;
Conference_Titel :
Signal Processing Advances in Wireless Communications (SPAWC), 2010 IEEE Eleventh International Workshop on
Conference_Location :
Marrakech
Print_ISBN :
978-1-4244-6990-1
Electronic_ISBN :
1948-3244
DOI :
10.1109/SPAWC.2010.5671095
