Design of Optimum M-Phase Spreading Sequences of Markov Chains
H. FUJISAKI · IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences · 2007
We design M(≥3)-phase spreading sequences of Markov chains optimal in terms of bit error probabilities in asynchronous SSMA (spread spectrum multiple access) communication systems. To this end, we obtain the distributions of the normalized MAI (multiple access interference) for such systems and find a necessary and sufficient condition that the distributions become independent of the phase shifts.