Improved DADS Performance with Noise Reduction by Averaging
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چکیده
In this paper, a method is proposed to improve the noise performance of the delay and add direct sequence (DADS) modulation scheme by modifying the structure of the reference signal and the demodulation algorithm. It is shown that noise reduction by averaging can enhance the bit error rate (BER) performance of DADS considerably. As the number of noisy chips exploited at the receiver increases, the signal to noise ratio (SNR) gap between the BER performance of the proposed modulation scheme and the binary phase-shift keying (BPSK) modulation scheme approaches 3 dB. The theoretical results derived for the BER are verified by simulations in additive white Gaussian noise (AWGN) and frequency selective Rayleigh channels.
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تاریخ انتشار 2012