Patent ID: 8514915

Claim:
An apparatus for frequency shifting of a first spread-spectrum signal, the apparatus comprising: a first port for receiving the first spread-spectrum signal in a first frequency band; a first I/Q demodulator coupled to the first port to receive the first spread-spectrum signal from the first port, for deriving the I and Q component signals of the first spread spectrum signal; a first I/Q modulator coupled to the first I/Q demodulator to receive the first spread spectrum signal I and Q component signals, the first I/Q modulator being operative to reconstruct the first spread-spectrum signal and to frequency shift the first spread-spectrum signal to a second frequency band; a second port coupled to the first I/Q modulator to receive the frequency shifted signal from the first I/Q modulator; a third port for receiving the second spread-spectrum signal in the second frequency band; a second I/Q demodulator coupled to the third port to receive the second spread-spectrum signal from the third port; a first filter coupled to the first port for substantially passing only signals in the first frequency band; a first threshold detector coupled to the first filter for detecting the presence of a signal in the first frequency band; and a second filter coupled to the third port for substantially passing only signals in the second frequency band; and a second threshold detector coupled to the second filter for detecting the presence of a signal in the second frequency band.