PERFORMANCE IMPROVEMENT OF OFDM BY PILOT-AIDED SPARCECHANNEL ESTIMATION

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For OFDM systems, number, location, and power distribution of pilot symbols are designed based on mean squared channel estimation error. The proposed method is applicable to OFDM-based cognitive radio with any null subcarriers. The sub-optimal location of pilot symbols is given by using cross entropy optimization that is a non-linear optimization technique. Pilot power distribution is determined by solving a convex optimization. Numerical simulations show that the proposed method outperformsthe conventional method.