Method and Apparatus For Transmitting a Signal Within a Predetermined Spectral Mask
First Claim
1. A transmitting apparatus for transmitting a signal within a predetermined spectral mask defining a range of power density limits across a frequency range, the apparatus comprising:
- a first signal source for providing a first input signal;
a filter coupled to the first signal source for low-pass filtering the first input signal to produce a first filtered signal, the filter being selectively operable in a first mode in which the first input signal is filtered within a narrower bandwidth and in a second mode in which the first input signal is filtered within a broader bandwidth;
a modulator coupled to the filter for modulating the first filtered signal to produce a first modulated signal;
a transmitter, coupled to the modulator, for transmitting the first modulated signal at a required power level as a transmitted signal having a spectral envelope; and
a controller for controlling operation of the filter depending on the required power level such that the first input signal is so filtered in the first mode when the required power level is higher that the spectral envelope of the transmitted signal is within the spectral mask, and is so filtered in the second mode when the required power level is lower that the spectral envelope of the transmitted signal remains within the spectral mask.
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Abstract
The present patent application comprises a transmitting method and apparatus 240. A signal source 241 provides an input signal to a low-pass filter 242 which filters the input signal to produce a filtered signal. The filter 242 is selectively operable in a first mode in which the input signal is filtered within a narrower bandwidth; and in a second mode in which the input signal is filtered within a broader bandwidth. The filtered signal is output to a modulator 243 which modulates the filtered signal to produce a modulated signal. The modulated signal is output to a transmitter 244 which transmits the modulated signal.
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Citations
46 Claims
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1. A transmitting apparatus for transmitting a signal within a predetermined spectral mask defining a range of power density limits across a frequency range, the apparatus comprising:
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a first signal source for providing a first input signal; a filter coupled to the first signal source for low-pass filtering the first input signal to produce a first filtered signal, the filter being selectively operable in a first mode in which the first input signal is filtered within a narrower bandwidth and in a second mode in which the first input signal is filtered within a broader bandwidth; a modulator coupled to the filter for modulating the first filtered signal to produce a first modulated signal; a transmitter, coupled to the modulator, for transmitting the first modulated signal at a required power level as a transmitted signal having a spectral envelope; and a controller for controlling operation of the filter depending on the required power level such that the first input signal is so filtered in the first mode when the required power level is higher that the spectral envelope of the transmitted signal is within the spectral mask, and is so filtered in the second mode when the required power level is lower that the spectral envelope of the transmitted signal remains within the spectral mask. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of transmitting a signal within a predetermined spectral mask defining a range of power density limits across a frequency range, the method comprising:
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providing a first input signal; low-pass filtering the first input signal to produce a first filtered signal, the filtering being performed in one of a first mode and a second mode, in which first mode the first input signal is filtered within a narrower bandwidth and in which second mode the first input signal is filtered within a broader bandwidth; modulating the first filtered signal to produce a first modulated signal; transmitting the first modulated signal at a required power level as a transmitted signal having a spectral envelope; and controlling the filtering depending on the required power level such that the first input signal is so filtered in the first mode when the required power level is higher that the spectral envelope of the transmitted signal is within the spectral mask and is so filtered in the second mode when the required power level is lower that the spectral envelope of the transmitted signal remains within the spectral mask. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A transmitting apparatus for transmitting a signal within a predetermined spectral mask defining a range of power density limits across a frequency range, the apparatus comprising:
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means for providing a first input signal; means for filtering the first input signal to produce a first filtered signal, the means for filtering being selectively operable, in a first mode, to filter the first input signal within a narrower bandwidth and, in a second mode, to filter the input signal within a broader bandwidth; means for modulating the first filtered signal to produce a first modulated signal; means for transmitting the first modulated signal at a required power level as a transmitted signal having a spectral envelope; and means for controlling operation of the filter depending on the required power level such that the input signal is so filtered in the first mode when the required power level is higher that the spectral envelope of the transmitted signal is within the spectral mask and is so filtered in the second mode when the required power level is lower that the spectral envelope of the transmitted signal remains within the spectral mask. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A transmitting apparatus for transmitting a signal within a predetermined spectral mask defining a range of power density limits across a frequency range, the apparatus comprising:
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a processor; memory in electronic communication with the processor; and instructions stored in memory, the instructions being executable by the processor to; provide a first input signal; low-pass filter the first input signal to produce a first filtered signal, the filtering being performed in one of a first mode and a second mode, in which first mode the first input signal is filtered within a narrower bandwidth and in which second mode the first input signal is filtered within a broader bandwidth; modulate the first filtered signal to produce a first modulated signal; transmit the first modulated signal at a required power level as a transmitted signal having a spectral envelope; and control the filtering depending on the required power level such that the first input signal is so filtered in the first mode when the required power level is higher that the spectral envelope of the transmitted signal is within the spectral mask and is so filtered in the second mode when the required power level is lower that the spectral envelope of the transmitted signal remains within the spectral mask. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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45. A computer program product, comprising:
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computer-readable medium comprising; code for causing a computer to transmit a signal within a predetermined spectral mask defining a range of power density limits across a frequency range, the code comprising instructions to; provide a first input signal; low-pass filter the input signal to produce a first filtered signal, the filtering being performed in one of a first mode in which the input signal is filtered within a narrower bandwidth and a second mode in which the input signal is filtered within a broader bandwidth; modulate the first filtered signal to produce a first modulated signal; transmit the first modulated signal at a required power level as a transmitted signal having a spectral envelope; and control the filtering depending on the required power level such that the first input signal is so filtered in the first mode when the required power level is higher that the spectral envelope of the transmitted signal is within the spectral mask and is so filtered in the second mode when the required power level is lower that the spectral envelope of the transmitted signal remains within the spectral mask.
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46. A radio transmitter in which a signal is conditioned selecting and using one of two conditioners which are so configured that one of the two conditioners has a narrower bandwidth and the other of the two conditioners has a broader bandwidth, the transmitter being configured to select the one conditioner for use depending on whether the signal is to be transmitted at a higher power or at a lower power.
Specification