Performance evaluation of LFSR-based spreading sequences with negative auto-correlation designed by Chaos theory of modulo-2 added sequences
Akio Tsuneda, Yasunori Miyazaki · 2009
In asynchronous DS/CDMA systems, spreading sequences with appropriate negative auto-correlation properties can outperform conventional LFSR (linear feedback shift register) sequences with respect to bit error rate (BER) performance. Spreading sequences with negative auto-correlations can be generated by using one-dimensional chaotic maps but their hardware cost is more expensive than LFSRs. In this paper, we design spreading sequences with negative auto-correlation to be generated by LFSRs, which is based on the chaos theory for the Bernoulli chaotic map and modulo-2 added binary sequences. By computer simulations, we evaluate BER performances of asynchronous DS/CDMA communication systems using the proposed sequences.