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A new class of spread-spectrum multipleaccess systems with continuous phase modulation is defined. The signals are unique in that the information bits and spreading chips affect the phase separately. The signal allows shaping of the power spectral density, via the spreading phase, with little impact to receiver complexity. Receiver complexity is driven by the information phase modulation method. A specific subclass that employs a serial MSK receiver is examined.

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An analysis of a quaternary direct-sequence spread-spectrum multiple-access communication system is presented. The system uses a correlation receiver and random signature sequences in an additive white Gaussian noise channel. The multiple-access interference (MAI) is analysed using a product of symmetric multinomials. The analysis is greatly simplified by assuming independent MA1 for different interferers. The result is a procedure for the determination of independent MA1 probability density functions (pdf). The pdf's are subsequently used to obtain an approximation to the probability of bit error.