Abstract
In this paper, the KMM¯ sequence (i.e., a clock-controlled sequence) is presented as a new spreading code for A-CDMA (Asynchronous CDMA) systems. The conditions, which PN sequence as spreading codes should satisfy, are given on the basis of an A-CDMA system model. The properties of KMM¯ sequences are described and their feasibility as the spreading codes for an A-CDMA system are analysed. The computer simulation compares the cross-correlation of m-sequence and KMM¯ sequence to prove the good cross-correlation property of KMM¯ sequence. Numerical results show the impact of the m-sequence and the KMM¯ sequence on the system performance, as well as the differences between m-sequences and KMM¯ sequences under different user number and processing gain for A-CDMA system.
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