The performance of asynchronous Gaussian minimum shift keying (GMSK) direct-sequence spread-spectrum multiple-access (DS/SSMA) systems is evaluated using Pursley's approach. Taking into consideration the interchip interference caused by the Gaussian lowpass filter, a closed-form expression for signal-to-noise (SNR) at the output of a coherent receiver is derived and then used for system analysis. A system optimisation or evaluation based on output SNR is efficiently carried out, compared with Monte-Carlo simulation.
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Park et al. (2002) studied this question.
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