Modem for use in multipath communication systems

Details Modem for use in multipath communication systems Modem for use in multipath communication systems

1986-07-03

1987-09-15

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

380 34, 380 42, H04B 700

Patent

active

046944672

ABSTRACT:
A modem in which the transmitter uses spectrum spreading techniques applied to sequentially supplied input bits, a first group thereof having one spread spectrum sequence characteristic and a second group thereof having a different spread spectrum sequence characteristic, the spread spectrum bits being modulated and transmitted. The receiver generates complex samples of the received modulated signal at a baseband frequency and uses a detector for providing signal samples of the complex samples which are time delayed relative to each other. A selected number of the time delayed samples are de-spread and demodulated and the de-spread and demodulated samples are then combined to form a demodulated receiver output signal.

REFERENCES:
patent: 4351064 (1982-09-01), Ewanus
patent: 4454604 (1984-06-01), Myers
patent: 4606040 (1986-08-01), David et al.

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