JCS_V4_N3_RP1 Jianjie Tian Stevan M. Berber Gerard B. Rowe Journal on Communication Engineering and Systems 2277-5242 4 3 1 8 Frequency-Selective Rayleigh Fading, Chaotic Spreading, Discrete Time Domain, BER Expressions, Wireless Sensor Networks Wireless communication system have been well analyzed with flat fading and AWGN present in the channel for wireless sensor networks (WSNs). However, wireless transmission channels in closed space should be considered to have frequency selective nature. Therefore, a comprehensive analysis of the probability of error of the systems operating in a frequency selective fading channel is performed in this paper. The authors investigated a novel mathematical model of a communication system using chaotic spreading sequences over frequency-selective Rayleigh fading channels in WSNs. They also explore the potential use of chip-interleaving technique to reduce the fading influence. Furthermore, all the theoretical closed form expressions are performed in the discrete time domain form, which has not been used before and it is suitable for direct implementation in DSP or VLSI. Theoretical probability of error expressions in closed form are derived. Simulation results are present to confirm the theoretical expressions. May - July 2015 Copyright © 2015 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=3450