Abstract
This paper proposes a novel approach for optimal pilot sequence design for channel estimation in single carrier (SC) and multi carrier (MC) block transmission systems over frequency selective channels. The training design is based on minimizing the Bayesian Cramer-Rao bound (BCRB) for mean square error (MSE) of channel estimation which also employs the prior knowledge of the channel in conjunction with the receiver noise covariance subject to a total transmit power constraint. The proposed scheme derives the optimal pilot sequence which is applicable to all four block transmission systems i.e. single carrier zero padding (SC-ZP), multi-carrier zero padding (MC-ZP), single carrier cyclic prefix (SC-CP) and multi-carrier cyclic prefix (MC-CP) systems. Thus, the proposed framework and results derived are general with wide applicability. Simulation results are presented to show the improved performance of the proposed pilot design scheme in comparison to a conventional pilot design, in terms of both the mean square error (MSE) and bit error rate (BER).
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