The performance of continuous-phase-coded DS/SSMA communications

A class of spread-spectrum systems with continuous-phase spreading signals is proposed. We present a characterization of the spectral-spreading signals that allows computation of various measures of the system performance, such as the signal-to-noise ratio (SNR), spectral density, and average bit-error probability. The error probability can be evaluated if the distributions of the multiple-access interferences (MAIs) are available. We obtain the conditional distributions of random variables that characterize the MAI given the time delays. These conditional distributions are used to compute vectors, allowing the average bit-error probability to be computed with arbitrary accuracy. Since most of the computations only involve array additions and multiplications, these operations can be performed efficiently on array processors.