Residual Number System Assisted CDMA: A New System Concept

In this paper a new, so-called residue number system (RNS) based direct sequence-code division multiple access (DS-CDMA) scheme employing $M$-ary orthogonal modulation is proposed. In conventional $M$-ary orthogonal modulation, the complexity of the receiver increases exponentially with the number of bits per symbol. However, using this technique, a linear, rather than exponential receiver complexity dependence on the number of bits per symbol holds. Hence, powerful nonbinary error control schemes such as Reed-Solomon codes over a large Galois Field can be exciently incorporated. Furthermore, the error correction properties of the RNS can be exploited in order to improve the performance of the system.