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In this paper, the authors propose a Cooperative Particle Swarm Optimization (CPSO) based channel estimation/equalization scheme for Multiple-Input Multiple-Output Zero-Padded Single-Carrier (MIMO-ZPSC) systems with large dimensions in frequency selective channels. They estimate the channel state information at the receiver in time domain using a PSO based algorithm during training phase. Using the estimated channel, they perform information symbol detection in the frequency domain using FFT based processing. For this detection, they use a low complexity OLA (OverLap Add) likelihood ascent search equalizer which uses Minimum Mean Square (MMSE) equalizer solution as the initial solution.
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