Increasing CDMA capacity using multiple orthogonal spreading sequence sets and successive interference cancellation (original) (raw)
Marc Moeneclaey2002, IEEE International Conference on Communications
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In this paper, we present a code-division multiple access (CDMA) system with a spreading factor of N that can accommodate up to mN users, where m≥2. The m sets of orthogonal spreading sequences are constructed by overlaying the same N orthogonal Walsh-Hadamard sequences with a set-specific pseudo-noise (PN) sequence. Interference between user signals from different sets is cancelled by means