Patent ID: 7852908

Claim:
A radio frequency (RF) receiver comprising: an RF mixer adapted to: receive an RF input signal based on a first reference code, such that the first RF input signal comprises at least one interference signal having interfering frequency content and the at least one interference signal comprises at least one non-correlating interference signal having non-correlating interfering frequency content; and down-convert the RF input signal with a local oscillator signal to provide a down-converted RF input signal; an analog-to-digital converter (ADC) adapted to sample the down-converted RF input signal using a sampling clock to provide a sampled input signal; correlation and filtering circuitry adapted to correlate and filter the sampled input signal by: mixing the sampled input signal with a modified first reference code to provide a discrete correlation having at least two correlation elements, such that the modified first reference code is based on the first reference code and filtering characteristics, and is further based on the non-correlating interfering frequency content, such that the filtering characteristics reduce effects of the interfering frequency content on a filtered correlation signal; and summing the at least two correlation elements to provide the filtered correlation signal.