Performance of Asynchronous Band-Limited DS/SSMA Systems

Takafumi SHIBATA  Masaaki KATAYAMA  Akira OGAWA  

IEICE TRANSACTIONS on Communications   Vol.E76-B   No.8   pp.921-928
Publication Date: 1993/08/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Spread Spectrum Techniques and Applications)
direct-sequence spread-spectrum multiple-access,  signal-to-noise plus interference ratio,  band-limitation,  spectral efficiency,  gold sequence,  

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This paper discusses the performance of asynchronous direct-sequence spread-spectrum multiple-access systems using binary or quaternary phase-shift keyed signals with the strict bandwidth-limitation by Nyquist filtering. The signal-to-noise plus interference ratio (SNIR) at the output from the correlation receiver is derived analytically taking the cross-correlation characteristics of spreading sequences into account, and also an approximated SNIR of a simple form is presented for the systems employing Gold sequences. Based on the analyzed result of SNIR, bit error rate performance and spectral efficiency are also estimated.