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Noise shaping technique for spread spectrum communications

  • US 7,099,373 B2
  • Filed: 10/06/2003
  • Issued: 08/29/2006
  • Est. Priority Date: 11/02/1993
  • Status: Expired due to Fees
First Claim
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1. A transmitter for transmitting a spread spectrum code division multiple access (CDMA) signal at a system chip rate over a carrier frequency, comprising:

  • a single-sideband modulator for shifting the signal spectrum to the edge of the spectrum bandwidth, including;

    a first phase shift network for converting the signal into I and Q components;

    a second phase shift network for producing a sinusoidal carrier signal and a cosinusoidal carrier signal;

    a pair of balanced modulators for receiving sinusoidal and cosinusoidal carrier signals from the second phase shifter; and

    an adder for combining the balanced modulator outputs; and

    a reference signal input with constant frequency for setting the shifting by said modulator.

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