Data transmitter and receiver of a spread spectrum communication

Details Data transmitter and receiver of a spread spectrum communication Data transmitter and receiver of a spread spectrum communication

1995-11-22

1998-01-27

Ghebretinsae, Temesghen

Pulse or digital communications

Repeaters

Testing

375208, 370209, H04B 1707

Patent

active

057128693

ABSTRACT:
An improved spread spectrum communication system includes a transmitter and a receiver utilizing a pilot channel for the transmission of pure rather than modulated PN codes for code acquisition or tracking purposes with a lower bit error rate. The pilot signal is used to obtain initial system synchronization and phase tracking of the transmitted spread spectrum signal. At the transmitter side, a Walsh code generator, a Walsh modulator, a first PN code generator, a first band spreader, a second band spreader, finite impulse response filters, digital-analog converters, low-pass filters, an intermediate frequency mixer, a carrier mixer, a band-pass filter are used to transmit a spread spectrum signal. At the receiver side, a corresponding band-pass filter, a carrier mixer, an intermediate-frequency mixer, low-pass filters, analog-digital converters, a second PN code generator, an I channel despreader, a Q channel despreader, a PN code synchronization controller, a Walsh code generator, a first Walsh demodulator, a second Walsh demodulator, accumulator & dump circuits, a combiner, and a data decider are used to demodulate a received spread spectrum signal

REFERENCES:
patent: 3465269 (1969-09-01), Schaffner et al.
patent: 5036523 (1991-07-01), Briskman
patent: 5309474 (1994-05-01), Gilhousen et al.
patent: 5383219 (1995-01-01), Wheatley
patent: 5406629 (1995-04-01), Harrison et al.
patent: 5414728 (1995-05-01), Zehavi
patent: 5416797 (1995-05-01), Gilhousen et al.
patent: 5490165 (1996-02-01), Blakeney, II et al.

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