Pulse or digital communications – Repeaters – Testing
Patent
1988-04-29
1990-03-27
Cangialosi, Salvatore
Pulse or digital communications
Repeaters
Testing
380 1, H04K 100
Patent
active
049127217
ABSTRACT:
Apparatus for transmitting data spread across at least a portion of the bandwidth of a cable television channel comprises a carrier signal oscillator, a frequency divider, a pseudorandom sequence generator and two exclusive OR gates. A first exclusive OR gate serves to spread a data signal across the pseudorandom noise sequence generator having a much higher chip rate than the bit rate of the data signal. The second exclusive OR gate modulates the spread spectrum data signal to a carrier frequency for transmission over the cable television channel. The apparatus may be applied for return path transmission in the 0-30 megahertz band which is high susceptible to interference noise and provides approximately a 20 dB signal to interference ratio advantage over known data coding and transmission schemes. A microprocessor normally present in a cable television terminal may format data for transmission, control the spread spectrum modulation process and control gain control circuitry for introducing an appropriate power level into the cable plant.
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"Spread Spectrum Used in Distributed Home Bus" by Richard Dohetry News Release of NEC Showing Approximately Jan. 1988.
Pidgeon, Jr. Rezin E.
Thompson Leo J.
Zendt Frederick T.
Cangialosi Salvatore
Scientific-Atlanta, Inc.
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