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Multiuser Pilot Pattern for Uplink Multicarrier Systems With Frequency-Dependent I/Q Imbalance

Authors:: Ishaque, A. , Sakulkar, P. , Ascheid, G.
Book Title:: Proceedings of IEEE Wireless Communications and Networking Conference (WCNC)
Publisher:: IEEE
Pages:: p.p. 936-941
Address:: Istanbul, Turkey
Date:: Apr. 2014
DOI:: 10.1109/WCNC.2014.6952234
Language:: English
Abstract:: This paper deals with the optimization of the multiuser (MU) pilot design for orthogonal-frequency-division-multiple-access (OFDMA) systems perturbed by the I/Q imbalance (IQI) impairment. For the frequency-selective Rayleigh propagation channels, the proposed approach exploits the decoupled direct and image channels, and the knowledge of the effective channel statistics to realize dual linear-minimum-mean-square-error (LMMSE) channel estimators. We develop the pilot power distribution and positioning approach for the training sequence design under the channel mean-square-error (MSE) minimization criterion considering the existence of IQI and guard bands. For the pilot power allocation, we formulate the problem into semi-definite programming whereas positions are assigned with either a heuristic greedy method or fairness instigating genetic combinatorial optimization. Simulation results indicate that with the proposed pilot design, it is possible to achieve a better MSE performance than the conventional MU channel estimation methods and introduce user fairness when selecting pilot composition from the shared pool of resources.
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