Patent ID: 8139685
Filing Date: 2012-03-20
Classification: G01S,H04B

Abstract:
1. A receiver comprising: an oscillator configured to output a frequency reference without the use of an oscillator control signal; a first downconverter configured to output a first complex digital signal based on a received first radio-frequency (RF) signal having a first carrier frequency and on the frequency reference output by the oscillator; a second downconverter configured to output a second complex digital signal based on a received second RF signal having a second carrier frequency different than the first carrier frequency and on the frequency reference output by the oscillator; a frequency control unit configured to calculate a frequency correction signal based on the first complex digital signal output by the first downconverter, wherein the frequency control unit is coupled to indirectly receive the frequency reference from the oscillator, wherein the frequency correction signal is indicative of frequency error of at least one of the frequency reference or the first RF signal, and wherein the frequency control unit is configured to produce a timing adjustment signal based on the first complex digital signal; a processing unit configured to produce, according to the frequency correction signal, a baseband digital signal based on the second complex digital signal output by the second downconverter, wherein the baseband digital signal includes a stream of information symbols carried by the second RF signal; and a clock synthesizer configured to produce a sampling clock signal according to the frequency reference and the timing adjustment signal.