Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1993-01-29
1995-09-05
Chin, Stephen
Pulse or digital communications
Receivers
Interference or noise reduction
455273, 375330, H04B 710, H04L 102
Patent
active
054486025
ABSTRACT:
A plurality of reception branches receive digital modulated signals and convert received digital modulated signals into intermediate frequency signals having frequency differences having a predetermined relationship with a modulation baseband signal. An adder adds the intermediate frequency signals converted by the plurality of reception branches. A delayed and differential detection section delays and differentially detects a sum signal from the adder. A post detection filter filters a delayed and differentially detected signal from the delayed and differential detection section at a bandwidth higher than a Nyquist frequency of the received digital modulated signals, thereby outputting demodulated signals of the received digital modulated signals.
REFERENCES:
patent: 4715048 (1987-12-01), Masamura
Ogose, et al., IEEE Transactions on Vehicular Technology, vol. VT-33, No. Feb. 1984, pp. 37-43. "A Transmitter Diversity for MSK with Two-Bit Differential Detection".
Nagasawa Zenichirou
Ohmori Hideaki
Chin Stephen
Phan Hai H.
Small Power Communication Systems Research Laboratories Co., Ltd
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