Pulse or digital communications – Repeaters – Testing
Patent
1997-09-23
2000-04-04
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375267, 370206, 455 76, H04B 1500
Patent
active
060470186
ABSTRACT:
Frequencies (f1 to f7) are selected in respective time slots (T1 to T7) according to digital data to be transmitted. Digital data to be transmitted is indicated by a combination of frequencies selected in the respective time slots. Since a single time slot can select a plurality of frequencies, e.g., f2, f4 and f5, the total number of frequency patterns which can be achieved is increased. Therefore, since the number of combined patterns of substantially available frequencies is also increased, the number of bits of digital data which can be transmitted in a single data cycle (a period related to T1 to T7) is increased, and a transmission efficiency is improved.
REFERENCES:
patent: 5548582 (1996-08-01), Brajal et al.
patent: 5870391 (1999-02-01), Nago
patent: 5907545 (1999-03-01), Arai et al.
John Bingham, "Multicarrier Modulation for Data Transmission: An Idea Whose Time Has Come," IEEE Communication Magazine, pp. 5-14, May 1990.
Eimatsu Moriyama, et al. "Configuration and Basic Performance of Advanced Frequency-Hopping Spread Spectrum Communication Equipment for Land Mobile Radio", vol. 32, No. 164, pp. 165-177.
D.J. Goodman, et al. "Frequency-Hopped Multilevel FSK for Mobile Radio", American Telephone and Telegraph Company, The Bell System Technical Journal, vol. 59, No. 7, Sep. 1980, pp. 1257-1275.
Chin Stephen
Fan Chieh M.
Sanyo Electric Co,. Ltd.
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