Signal generator and OFDM modulator synchronized to external device
First Claim
1. A signal generating apparatus comprising:
- output means for conducting predetermined processing on a given signal, based upon a clock signal having a first frequency including a floating frequency component supplied from a first oscillator, and outputting a first signal having the first frequency;
adder means for adding a second signal having a second frequency including no floating frequency component, supplied from a second oscillator and the clock signal supplied from the first oscillator, and outputting a third signal having a frequency equivalent to sum of the first frequency and the second frequency; and
frequency converter means for receiving the first signal outputted from the output means and the third signal outputted from the adder means, conducting frequency conversion based upon the first signal and the third signal, and thereby outputting an output signal having the second frequency including no floating frequency component.
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Abstract
An OFDM modulator includes an OFDM modulator section for conducting OFDM modulation on a signal, based upon an OFDM clock FCLK, and outputting an OFDM signal, an adder for adding the OFDM clock FCLK to a local signal FPLO for frequency conversion, and a frequency converter for conducting frequency conversion on the OFDM signal supplied from the OFDM modulator section, based upon an output signal of the adder. The OFDM modulator thus outputs an IF signal having a frequency equivalent to that of the local signal. As a result, the floating frequency component of the OFDM clock on the OFDM modulator section side is canceled by the floating frequency component of the OFDM clock on the frequency adder side. There is thus obtained an IF signal which can be synchronized to a frequency (for example, 10 MHz) of an external device and which has the same frequency as that of the local signal FPLO.
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Citations
4 Claims
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1. A signal generating apparatus comprising:
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output means for conducting predetermined processing on a given signal, based upon a clock signal having a first frequency including a floating frequency component supplied from a first oscillator, and outputting a first signal having the first frequency;
adder means for adding a second signal having a second frequency including no floating frequency component, supplied from a second oscillator and the clock signal supplied from the first oscillator, and outputting a third signal having a frequency equivalent to sum of the first frequency and the second frequency; and
frequency converter means for receiving the first signal outputted from the output means and the third signal outputted from the adder means, conducting frequency conversion based upon the first signal and the third signal, and thereby outputting an output signal having the second frequency including no floating frequency component. - View Dependent Claims (2)
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3. An OFDM modulating apparatus comprising:
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output means for conducting OFDM modulation processing on a given signal, based upon an OFDM clock signal having a first frequency including a floating frequency component supplied from an OFDM oscillator, and outputting an OFDM signal having the first frequency;
adder means for adding a local signal having a second frequency including no floating frequency component, supplied from a local oscillator and the OFDM clock signal supplied from the OFDM clock oscillator, and outputting a third signal having a frequency equivalent to sum of the first frequency and the second frequency; and
frequency converter means for receiving the OFDM signal outputted from the output means and the third signal outputted from the adder means, conducting frequency conversion based upon the OFDM signal and the third signal, and thereby outputting an IF signal having the second frequency including no floating frequency component. - View Dependent Claims (4)
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Specification