Performance of DSSS-QPSK for Kasami Codes in Rayleigh Fading Channel

International Journal of Electronics and Communication Engineering

© 2024 by SSRG - IJECE Journal

Volume 11 Issue 5

Year of Publication : 2024

Authors : M. Dileep Reddy, G. Sreenivasulu

10.14445/23488549/IJECE-V11I5P108

How to Cite?

M. Dileep Reddy, G. Sreenivasulu, "Performance of DSSS-QPSK for Kasami Codes in Rayleigh Fading Channel," SSRG International Journal of Electronics and Communication Engineering, vol. 11,  no. 5, pp. 78-83, 2024. Crossref, https://doi.org/10.14445/23488549/IJECE-V11I5P108

Abstract:

Kasami sequences are derived from maximal sequences. This paper presents the auto correlation and cross correlation values of Kasami codes and their Comparison with the m sequence. The objective of this paper is to evaluate the effect of various length Kasami codes on the Bit Error Rate (BER) performance of multi-user spread spectrum Quadrature Phase Shift Keying (QPSK) in the fading channel, which exhibits a frequency selective nature and follows Rayleigh distribution, considering delayed exponential power profile with The Minimum Mean Squared Error (MSME) equalizer at receiver. Bit Error Rate Vs SNR (dB) for QPSK modulation in Kasami codes is shown using a graphical approach using MATLAB®.

Keywords:

Kasami Sequences, QPSK, MMSE Equalizer, Rayleigh fading channel, BER.

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