Turbo MMSE equalizer for spread OFDM signal detection

Ali Elghariani; Michael D. Zoltowski

doi:10.1117/12.2018188

28 May 2013 Turbo MMSE equalizer for spread OFDM signal detection

Proceedings Volume 8753, Wireless Sensing, Localization, and Processing VIII; 875308 (2013) https://doi.org/10.1117/12.2018188
Event: SPIE Defense, Security, and Sensing, 2013, Baltimore, Maryland, United States

Abstract

Symbol spread OFDM technique has been introduced to improve diversity performance of the conventional OFDM system in the frequency selective fading channel, where, in this technique, every data symbol is mod- ulated using all OFDM subcarriers. Linear Minimum Mean Square Error (MMSE) equalizer is widely used in spread OFDM signal detection because of its low complexity compared to optimal equalizers such as Maximum Likelihood (ML).1 In this paper we introduce turbo equalization based receiver for detecting symbol spread OFDM signal in which MMSE equalizer and channel decoder exchange soft information in an iterative fashion. Bit Error Rate (BER) performance is investigated with both full and partial spread scenarios and also with and without channel decoding. Simulation results show improved performance especially at low SNR regime and when partially spread OFDM scenario is used.

Citation Download Citation

Ali Elghariani and Michael D. Zoltowski "Turbo MMSE equalizer for spread OFDM signal detection", Proc. SPIE 8753, Wireless Sensing, Localization, and Processing VIII, 875308 (28 May 2013); https://doi.org/10.1117/12.2018188

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