Repeater and method for processing signal, and method for converting synchronous frequency thereof
First Claim
1. A signal processing method of a repeater that processes a received signal and outputs a transmitting signal, the signal processing method comprising:
- converting the received signal to a first intermediate frequency signal based on a local oscillating frequency for intermediate frequency conversion;
converting the first intermediate frequency signal to a second intermediate frequency signal by performing digital processing on the first intermediate frequency signal;
generating a first frequency tone signal that corresponds to a difference between a first radio frequency of the received signal and a second radio frequency of the transmitting signal;
generating a second frequency tone signal from the local oscillating frequency for intermediate frequency conversion and the first frequency tone signal; and
outputting the transmitting signal by up-converting the second intermediate frequency signal to the second radio frequency based on the second frequency tone signal.
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Abstract
A repeater having different input and output frequencies converts a signal received with the input frequency to a first intermediate frequency signal based on a local oscillating frequency for intermediate frequency conversion, and converts the first intermediate frequency signal to a second intermediate frequency signal by performing digital processing on the first intermediate frequency signal. Then, the repeater generates a first frequency tone signal that corresponds to a difference between the input and output frequencies, and generates a second frequency tone signal from the local oscillating frequency for intermediate frequency conversion and the first frequency tone signal. The repeater up-converts the second intermediate frequency signal to the output frequency based on the second frequency tone signal, and transmits the signal.
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Citations
13 Claims
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1. A signal processing method of a repeater that processes a received signal and outputs a transmitting signal, the signal processing method comprising:
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converting the received signal to a first intermediate frequency signal based on a local oscillating frequency for intermediate frequency conversion; converting the first intermediate frequency signal to a second intermediate frequency signal by performing digital processing on the first intermediate frequency signal; generating a first frequency tone signal that corresponds to a difference between a first radio frequency of the received signal and a second radio frequency of the transmitting signal; generating a second frequency tone signal from the local oscillating frequency for intermediate frequency conversion and the first frequency tone signal; and outputting the transmitting signal by up-converting the second intermediate frequency signal to the second radio frequency based on the second frequency tone signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A repeater for processing a received signal and transmitting a transmitting signal, the repeater comprising:
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a down-converter for converting a first radio frequency of the received signal to a first intermediate frequency based on a local oscillating frequency; a digital signal processor for down-converting the first intermediate frequency to a baseband frequency and frequency up-converting the baseband frequency to a second intermediate frequency; a frequency synchronizer for generating a third radio frequency that corresponds to a difference between the first radio frequency and the second radio frequency according to a reference clock, and generating a fourth radio frequency by mixing the local oscillating frequency and the third radio frequency; an up-converter for generating the second radio frequency by mixing the fourth radio frequency and the second intermediate frequency; and a transmitter for transmitting the transmitting signal with the second radio frequency. - View Dependent Claims (9, 10, 11)
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12. A frequency synchronization method of a repeater of which input frequency and output frequency are different from each other, the frequency synchronization method comprising:
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generating a first frequency that corresponds to a difference between the input frequency and the output frequency; generating a second frequency by mixing a local oscillating frequency with the first frequency, wherein the local oscillating frequency for intermediate frequency conversion is used for down-converting the input frequency to the intermediate frequency; and generating the output frequency by mixing the first intermediate frequency and the second frequency. - View Dependent Claims (13)
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Specification