Pulse or digital communications – Testing
Patent
1994-07-08
1996-10-08
Chin, Stephen
Pulse or digital communications
Testing
342196, 375347, H04B 710
Patent
active
055639097
ABSTRACT:
A radio communication system for mobile communications, or more specifically, a radio receiver for a base station which receives signals transmitted from a plurality of mobile stations is provided wherein the propagation characteristics of channels with respect to a frequency domain can be instanteously measured at all times even while the channels are in use. A frequency converter collectively receives signals transmitted from the mobile stations and converts the signals to IF-band signals, respectively. The IF-band signals output from the frequency converter are set apart from one another by corresponding ones of frequency differences of the signals transmitted from the mobile stations. Complex Fourier transform deriving means collectively derives the complex Fourier transforms of these IF-band signals, and outputs the resulting frequency spectra to analyzing means. The analyzing means simultaneously analyzes the propagation characteristics of the individual received waves, based on the frequency spectra supplied thereto. In accordance with the results of the analysis, a wave having excellent propagation characteristics is received.
REFERENCES:
patent: 5231648 (1993-07-01), Driedger et al.
patent: 5367539 (1994-11-01), Copley
patent: 5412390 (1995-05-01), Peavey et al.
Chin Stephen
Fujitsu Limited
Kim Kevin
LandOfFree
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