Expectation propagation aided frequency domain turbo equalizer for single-carrier spatial modulation systems

Chen, Yun;Tang, Wanbin;Xiao, Yue;Zheng, Chen;Xiang, Wei

Abstract

An efficient frequency-domain equalizer is developed for single-carrier (SC) aided spatial modulation (SM) systems over frequency-selective fading channels, by employing the idea of expectation propagation (EP) algorithms. Specifically, we design an EP-aided frequency domain turbo equalizer (EP-FDTE) for iterative information exchange between the equalizer and the soft decoder, leading to more reliable a posterior probability (APP) estimation for signal detection. Our simulation results demonstrate that the proposed equalizer outperforms conventional frequency-domain turbo equalizer (FDTE) and generalized approximate message passing (GAMP)-aided turbo equalizer for SC-SM transmission.

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IEEE Communications Letters

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1558-2558

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IEEE

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DOI

10.1109/LCOMM.2020.2974223