IMPROVED DISTANCE METRIC TECHNIQUE FOR DERIVING SOFT RELIABILITY INFORMATION OVER RAYLEIGH FADING CHANNEL

Authors

  • OO Ogundile DEPT. OF PHYSICS & TELECOMMUNICATIONS, TAI SOLARIN UNIV. OF EDUCATION, IJEBU-ODE, OGUN STATE, NIGERIA.
  • MO Oloyede DEPT. OF INFORMATION AND COMMUNICATION SCIENCE, UNIVERSITY OF ILORIN, ILORIN, KWARA STATE, NIGERIA.
  • OA Osanaiye DEPT. OF TELECOMMUNICATION ENGR., FEDERAL UNIVERSITY OF TECHNOLOGY, MINNA, NIGER STATE, NIGERIA.
  • FA Aina DEPARTMENT OF TELECOMMUNICATION SCIENCE, UNIVERSITY OF ILORIN, ILORIN, KWARA STATE, NIGERIA.

DOI:

https://doi.org/10.4314/njt.374.1877

Keywords:

CSI, cubic estimators, DM, fading channels, KV-RS decoder, LMMSE, OFDM, R-matrix, 16QAM.

Abstract

This paper presents an improved Distance Metric (DM) technique for deriving soft reliability information over Rayleigh fading channel. We compared this proposed DM technique with the conventionally used DM technique in the literature. The conventional DM method derives the soft reliability information from the output received symbols while the proposed DM method derives the soft reliability information from the Channel State Information (CSI) which result due to variations in the channel gain. Performance analysis of these DM methods are verified over flat Rayleigh fading channels, and on time-varying frequency-selective Rayleigh fading channels using rectangular M-QAM and OFDM systems respectively. Also, two channel estimation techniques are used to derived the CSI assuming different normalized Doppler frequency and frame length size. The performance of the conventional and proposed soft reliability derivation methods are documented through computer simulations assuming Koetter and Vardy, Reed-Solomon (KV-RS) soft decision decoding algorithm as the Forward Error Correction (FEC) scheme. From the computer simulation results, the proposed DM method offers significant improvement in Codeword Error Rate (CER) performance in comparison with the conventional DM method with no significant increase in computational delay and time complexity.

http://dx.doi.org/10.4314/njt.v37i4.34

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Published

2018-09-30

Issue

Section

Computer, Telecommunications, Software, Electrical & Electronics Engineering

How to Cite

IMPROVED DISTANCE METRIC TECHNIQUE FOR DERIVING SOFT RELIABILITY INFORMATION OVER RAYLEIGH FADING CHANNEL. (2018). Nigerian Journal of Technology, 37(4), 1110-1119. https://doi.org/10.4314/njt.374.1877