Coherent hybrid DS/SFH-SSMA micro and macro cellular communication

The performance of the coherent reception in synchronous hybrid direct-sequence/slow-frequency hopping spread-spectrum multiple-access (DS/SFHSSMA) systems for micro and macrocellular communication systems is investigated. Multiuser interference and thermal noise are combined to Gaussian noise, the hitting interference of the hopping frequency is considered and the micro and macrocellular systems are operated over Rician and Rayleigh channel models respectively. Binary-phase-shift-keying (BPSK) modulation with coherent demodulation was considered. Maximum ratio combining (MRC) with Hamming and Golay coding techniques are employed for improving the bit error probability (BER) performance. Comparison of the hybrid DS/SFH BER performance for different users proved that both diversity and coding are required for satisfactory BER and the BER for the present hybrid DS/SFH system is inferior to that of purely DS or FH system.