H - Electricity – 04 – B
Patent
H - Electricity
04
B
363/10, 325/50
H04B 7/02 (2006.01)
Patent
CA 1276688
ABSTRACT OF THE DISCLOSURE A modulation method capable of high-speed or high-quality digital data transmission under a multipath fading transmissional, such as a radio transmission in an urban area of differential coding phase modulation and resides 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.
526943
Fetherstonhaugh & Co.
Matsushita Electric Industrial Co. Ltd.
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