PN codes Vs chaotic sequences: BER comparison perspective

Abstract

In this paper, we consider the BER performance of chaotic modulation schemes in Single-Input-Multiple-Output (SIMO) Nakagami fading channels. In particular, we focus on a system that employs Differential chaos Shift keying (DCSK). We consider transceiver scheme which require no channel state information at either the transmitter or the receiver. A distinct chaotic sequence is used at the transmit antenna to spread the data symbols and transmits omni directionally. At each receive antenna, the corresponding differential detection statistics is performed and these statistics are combined with maximum ratio combining for symbol detection. Simulation results show that the proposed schemes can effectively exploit spatial diversity of the underlying SIMO system. The performance of the system is evaluated for both chaotic sequence and PN sequence in terms of Bit Error Rate (BER) for various space diversity levels and average SNRs. Also, the BER performance of these systems is evaluated for various spreading code lengths.