Pulse or digital communications – Repeaters – Testing
Patent
1993-06-02
1994-05-03
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375 47, 375 64, 329302, H04L 2714
Patent
active
053094808
ABSTRACT:
Briefly, according to the invention, a receiver (100) for receiving a carrier signal MSK (minimum shift keying) modulated with a bit stream of a digital information signal (302) is disclosed. The receiver (100) comprises a quadrature demodulator (128) for providing baseband quadrature demodulated signals (306 and 308). The quadrature demodulated (128) is coupled to an EXOR (126) for providing a decoded bit stream of the digital information signal (312) thereby avoiding complex decoder circuits. The quadrature demodulator (128) includes a pair of mixers (106 and 108) for quadrature mixing the received carrier signal and a pair of filters (114 and 118) for filtering the outputs of the mixers (106 and 108). The filters (114 and 118) are coupled to a pair of limiters (116 and 120) for limiting the filtered signals.
REFERENCES:
patent: 3142723 (1964-07-01), Fleming
patent: 4503472 (1985-03-01), Lacher
patent: 4592072 (1986-05-01), Stewart
patent: 4596023 (1986-06-01), Driver et al.
patent: 4656646 (1987-04-01), Ryan
IEEE Transactions on Communications, vol. COM-27, No. 10; Oct. 1979; "A 100 Mbit/s Prototype MSK Modem for Satellite Communications," Morihiro et al.; pp. 1512-1518.
Boccuzzi Joseph
Powell, II Clinton C.
Chin Stephen
Ghebretinsae T.
Ghomeshi Mansour G.
Motorola Inc.
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