Error performance of chaotic digital code-division multiple access (CDMA) systems

Chaotic digital code-division multiple access ((CD)(2)MA) systems are new types of communication systems using chaotic carriers. (CD)(2)MA had found applications in both wireless and other communication systems. In this paper we study the error performance of chaotic digital code-division multiple access ((CD)(2)MA) systems used in both wireless environment and cable networks. We present first the details of the interleave mode of the (CD)(2)MA. When a (CD)(2)MA system works in the interleave mode, each of its transmitters only transmits signals during a portion of the bit duration of the message signal. The total interference level is thus reduced which in turn increases the channel capacity. The relationship between the bit error rate (BER) and the interleave rate is studied in both the synchronous (CD)(2)MA system used in cable systems, and the asynchronous (CD)(2)MA system used in wireless environments. Our simulation results show that in a cable system the synchronous (CD)(2)MA system can support 1.5 times more channel capacity than synchronous CDMA systems, and double the channel capacity of CDMA systems in wireless environments.