Patent ID: 6882680

Claim:
A quadrature phase modulation receiver for a spread spectrum communications system, the receiver comprising: (a) a mixer for mixing a received spread spectrum signal with a heterodyne signal to convert the frequency of the received spread spectrum signal to an intermediate frequency and thereby produce a received signal having the intermediate frequency, the received spread spectrum signal including a carrier signal modulated by a data signal and being spread by a spreading code; (b) a regulated oscillators module coupled to the mixer for producing the heterodyne signal and an intermediate frequency signal; (c) a frequency multiplier coupled to the mixer for receiving the received signal having the intermediate frequency and multiplying the frequency of the received signal having the intermediate frequency by a fixed multiplication factor to produce a frequency multiplied signal, wherein the frequency-multiplied signal has a phase that does not depend on a phase of the data signal, wherein the frequency multiplied signal produced by the frequency multiplier is characterized by the following expression: (cos(4 ωt +4φ))/2, where ω is the frequency of the received signal having the intermediate frequency and φ is the initial phase of the received signal having the intermediate frequency; and (d) means for producing an oscillator control signal based on the frequency multiplied signal output from the frequency multiplier, wherein the regulated oscillators module produces the intermediate frequency signal based on the oscillator control signal.