Technique for improving radio system performance during fading

Details Technique for improving radio system performance during fading Technique for improving radio system performance during fading

1984-10-12

1987-04-28

Ng, Jin F.

Telecommunications

Transmitter

Plural separate transmitters or channels

455129, 455276, 455289, 333 11, H04B 114, H04B 118

Patent

active

046619933

ABSTRACT:
A technique for reducing the average fade duration of signals in a radio system by simulating motion of a plurality of transmitting antennas is disclosed. This simulation is accomplished by slowly and continuously varying a characteristic of the modulated carrier signal supplied to the antennas. The altered characteristic can either be the power of the modulated carrier signal supplied to each of the antennas or the phase between modulated carrier signals coupled to the antennas. This technique can also be applied at a receiver to reduce the average fade duration of signals arriving thereat by simulating motion of a plurality of receiving antennas.

REFERENCES:
patent: 3289113 (1966-11-01), Boutelant
patent: 3392336 (1968-07-01), Schroeder
patent: 3422378 (1969-01-01), La Rosa
patent: 3693088 (1972-09-01), Rustako, Jr. et al.
patent: 3745464 (1973-07-01), Lee
patent: 3922685 (1985-11-01), Opas
patent: 4559489 (1985-12-01), Vancanti et al.
Adachi, "Transmitter Diversity for a Digital FM Paging System", IEEE Trans. on Vehicular Tech., Nov. 1979, pp. 333-337.
Hattori et al., "Theoretical Studies of a Simulcast Digital Radio Paging System Using a Carrier Frequency Offset Strategy", IEEE Trans. on Vehicular Tech., Feb. 1980, pp. 87-95.

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