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Coherent Hybrid DS-SFH Spread-Spectrum Multiple-Access Communications

1985; Institute of Electrical and Electronics Engineers; Volume: 3; Issue: 5 Linguagem: Inglês

10.1109/jsac.1985.1146249

1558-0008

E. Geraniotis,

Power Line Communications and Noise

The performance of synchronous and asynchronous hybrid direct-sequence/slow-frequency-hopped spread-spectrum multiple-access communications over additive white Gaussian noise channels is examined. Systems employing binary or quaternary phase-shift-keying modulation with coherent demodulation are investigated. Both deterministic and random signature sequences and frequency-hopping patterns are considered and several possible assignments for them are discussed. It is shown that the multiple-access capability of hybrid spread-spectrum is superior to that of pure frequency-hopped spread-spectrum, and inferior to that of pure direct-sequence spread-spectrum for systems with identical bandwidth expansion which employ the same data modulation and demodulation scheme and random hopping patterns and signature sequences.