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This book presents a new method to generate a new zero mean self-balance orthogonal (ZMSBO) chaotic code. This codes achieves a superior performance over the severe fading conditions, and under effect of large number of multiple access interference (MAI). A proposed system is constructed from a conventional error correction coding technique with Viterbi decoder, and three types of spread spectrum technique, which are the direct sequence spread spectrum, fast frequency hopping spread spectrum, in addition to time hopping spread spectrum. The performance of the proposed system is evaluated under three different channels, the Additive White Gaussian Channel (AWGN), the Rayleigh fading channel, and the frequency selective fading channel in both the single user and the multi-user cases. The performance is evaluated and compared using new chaotic code and traditional chaotic codes in addition to traditional Gold code in different conditions.