Comparing DSP realizations of correlator and SVM receivers for chaos-based multi-user DS-SS

This contribution presents a comparison between two realizations of chaos-based multi-user direct-sequence spread spectrum (DS-SS) system in digital signal processor (DSP) technology. The first realization is a conventional correlator receiver and the second is a new support vector machine (SVM) receiver. The two realizations were aimed at examining the tradeoffs between the two receiver types and their suitability for implementation in large scale wireless communication networks. The performance benchmarks used are the bit-error-rate (BER) and system speed. In both systems the information is spread using chaotic sequences resulting in physical layer security in the time and frequency domains. The hardware platform chosen was a 32-bit floating-point TigerSHARC DSP which proved to be sufficient for the representation of chaos-based spreading codes. Both implementations show excellent agreement with the previous theoretical findings in terms of BER performance. This agreement of results proves that the finite number resolution of the DSP does not have a significant effect on the system performance. Overall it is shown that the SVM receiver outperforms the correlator receiver in terms of the BER. However this improvement is at the expense of the processing speed.