Patent ID: 7236762

Claim:
A method in a direct conversion receiver for processing a received signal, comprising: mixing an oscillator frequency signal with said received signal for generating baseband frequency signals, wherein said received signal is modulated and centered at a carrier frequency, said received signal has a spectral characteristic of a plurality of lobes separated by notches, the notches being at null points located on a frequency axis at multiples of a chip rate from the carrier frequency, and the modulation extends a sideband above and below the carrier frequency; filtering out generated direct current (DC) components of said baseband signals centered at the zero frequency; setting said oscillator frequency signal equal to or about the carrier frequency plus an offset frequency, said offset frequency being equal to or about the difference between the carrier frequency and a null frequency, said null frequency centered at a notch of said sideband; and centering said notch at the zero frequency of said baseband signals through mixing.