Patent ID: 7548578

Claim:
A receiver, used in a frequency-hopping communication system comprising a transmitter which converts a baseband transmitting signal into a frequency-hopping signal and transmits the frequency-hopping signal to the receiver through a channel comprising N sub-bands, for receiving the frequency-hopping signal, the receiver comprising: a demodulator for demodulating the frequency-hopping signal into an analog baseband signal according to an oscillation frequency; a converter, coupled to the demodulator, for converting the analog baseband signal into a digital baseband signal; and a frequency-dehopping module, coupled to the converter, for generating a baseband receiving signal according to the digital baseband signal, wherein the baseband receiving signal comprises information of the baseband transmitting signal; wherein the frequency-dehopping module comprises: a shift signal generator for generating N shift signals corresponding to the N sub-bands; N multipliers, coupled to the ADC and the shift signal generator, for multiplying the digital baseband signal with the N shift signals respectively; N frequency down-converters, each frequency down-converter, coupled to the corresponding multiplier, for down-converting an output of the corresponding multiplier to generating a down-converted signal according to a down-converting factor M; and a selector, coupled to the N frequency down-converters, for selectively outputting one of the N down-converted signals from the N frequency down-converters to generate the baseband receiving signal.