Title: Pilot-based channel estimation in spatial modulated OFDM systems for mobile wireless applications

Authors: Anetha Mary Soman; R. Nakkeeran; Shinu Mathew John

Addresses: Department of Electronics Engineering, School of Engineering and Technology, Pondicherry Central University, Pondicherry, India ' Department of Electronics Engineering, School of Engineering and Technology, Pondicherry Central University, Pondicherry, India ' Department of Computer Science Engineering, St. Thomas College of Engineering and Technology, Mattannur, Kannur, Kerala, India

Abstract: Spatial modulation Orthogonal Frequency Division Multiplexing (SM OFDM) is a newly developed transmission technique that has been proposed as an alternative for multiple input multiple output (MIMO)-OFDM transmission. Channel estimation is important for coherent data detection in practical scenarios. This paper investigates estimate power, Mean Square Error (MSE) and Bit Error Rate (BER) parameter metrics with channel estimation algorithm for Additive White Gaussian Noise (AWGN) and Rayleigh fading channel on three test environments proposed by International Telecommunication Union (ITU) specified standard model. Simulation output shows that for an AWGN channel, an improvement of approximately 1 dB and 0.3 dB power is obtained with Minimum Mean Square Error (MMSE) estimate and Least Square (LS)-linear/Spline using DFT. Additionally, for various interpolations employed, MSE decreases as Signal to Noise Ratio (SNR) rises, and performance improvement in BER when compared to traditional LS/MMSE estimators also occurs. For Rayleigh fading channel also there arises an enhanced performance in the parameter metrics with MMSE-DFT compared to conventional estimators. In summary, simulation output shows that incorporating DFT algorithm can provide better estimate power, BER and MSE by eliminating the effect of noise externally the extreme channel delay length.

Keywords: MIMO; multicarrier modulation; spatial modulation; channel estimation; interpolation.

DOI: 10.1504/IJWMC.2023.130407

International Journal of Wireless and Mobile Computing, 2023 Vol.24 No.2, pp.181 - 194

Accepted: 08 Sep 2022
Published online: 19 Apr 2023 *

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