Patent
1975-10-02
1977-11-08
Griffin, Robert L.
325154, 325304, 325370, H04B 702
Patent
active
040577589
ABSTRACT:
A diversity system in a mobile radio communication system provided with a plurality of antenna systems operating over a multipath medium in at least one of the sending path and the receiving path. At the sending path, a carrier wave frequency- or phase-modulated by a digital baseband signal is transmitted from a transmitting antenna. A plurality of receiving antenna systems are switched at a constant frequency higher than the signaling rate of the digital baseband signal but less than the frequency shift width of the frequency modulated wave or less than a product of the maximum phase shift of the phase modulated wave and the signaling rate, so that average-power dispersion in a signal element of the digital baseband signal received at the receiving antenna systems is effectively compressed. Alternatively, the plurality of antennas may be transmitting antennas, and switched at the same rate to achieve compression of average power dispersion in the baseband signal elements.
REFERENCES:
patent: 3206679 (1965-09-01), Miller
patent: 3537011 (1970-10-01), Escoula
patent: 3693088 (1972-09-01), Rustako, Jr. et al.
patent: 3821646 (1974-06-01), Bickford et al.
patent: 3860872 (1975-01-01), Richardson et al.
Adachi Fumiyuki
Hattori Takeshi
Adams Bruce L.
Burns Robert E.
Griffin Robert L.
Lobato Emmanuel J.
Ng Jin F.
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