Pulse or digital communications – Repeaters – Testing
Patent
1986-12-29
1989-08-08
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
375 56, 375 57, 375 85, 332 16R, 332 23R, H04B 702, H04L 2718
Patent
active
048560251
ABSTRACT:
A modulation method capable of high-speed or high-quality digital data transmission under a multipath fading transmission line such as a radio transmission in an urban area is a type of differential coding phase modulation and residues in the fact that the rate of change of phase varies, or the phase is discrete, but does not employ a phase transition waveform of a constant value in a time slot which is a smallest unit for transmitting one symbol of data as in conventional methods. Phase transition waveforms in respective time slots which are spaced apart from each other by prescribed time slots are identical varying waveforms or discrete waveforms, and entirely shifted from each other by an amount according to the data transmitted. A detecting method employed is a differential detection method using a delay line for delaying a signal for a time corresponding to the prescribed time slots. In the presence of multipath propagation, a plurality of kinds of detected outputs are produced according to the multipath propagation, and the detected outputs are combined by a filter after the differential detection, producing a diversity effect for improving bit error rate characteristics. This digital signal transmission method is capable of multiphase transmission and can increase spectrum utilization efficiency.
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Griffin Robert L.
Huseman Marianne
Matsushita Electric - Industrial Co., Ltd.
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