Method and device for frequency hopping communication by changin

Details Method and device for frequency hopping communication by changin Method and device for frequency hopping communication by changin

1997-03-19

2000-11-14

Pham, Chi H.

Pulse or digital communications

Spread spectrum

Frequency hopping

375138, H04B 2730

Patent

active

061480207

ABSTRACT:
A receiver block comprises a receiver circuit, a down-converter, a mixer, a modulator circuit, a decoding circuit, a synchronization circuit, a spread code control unit, and a frequency synthesizer. No synchronization holding circuit is needed. MSFK and PSK are used as a primary modulation. Synchronization is initially acquired by repeatedly mixing a part of the frequency hopping code sequence. Synchronization is improved during a period arranged separately from data communication periods. Before data transmission, the primary modulation components are fixed and transmitted for two code periods. The time changes in phases attributed to secondary modulation components will be known. After this, the primary modulation components are found.

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Eimatsu Moriyama, et al., "Configuration and Basic Performance of Advanced Frequency-Hopping Spread Spectrum Communication Equipment for Land Mobile Radio", vol. 32, No. 164, Sep. 1986.
D.J. Goodman, et al., "Frequency-Hopped Multilevel FSK for Mobile Radio", The Bell System Technical Journal, vol. 59, No. 7, Sep. 1980.

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