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 second signal source for providing a second input signal;
a filter coupled to the first signal source for low-pass filtering the first input signal to produce a first filtered signal and coupled to the second signal source for low-pass filtering the second input signal to produce a second filtered signal, the filter being selectively operable in a first mode in which an input signal is filtered within a narrower bandwidth and in a second mode in which an input signal is filtered within a broader bandwidth, wherein the first signal is filtered according to the first mode and the second signal is filtered according to the second mode;
a modulator coupled to the filter for modulating the first filtered signal to produce a first modulated signal and the second filtered signal to produce a second 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 for transmitting the second modulated signal, wherein the first modulated signal and the second modulated signal are transmitted substantially simultaneously; 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
An apparatus and method are described for transmitting a signal within a predetermined spectral mask defining a range of power density limits across a frequency range. A signal source provides an input signal to a low-pass filter, which filters the input signal to produce a filtered signal. The filter 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, which modulates the filtered signal to produce a modulated signal. The modulated signal is output to a transmitter, which transmits the modulated signal.
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Citations
41 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 second signal source for providing a second input signal; a filter coupled to the first signal source for low-pass filtering the first input signal to produce a first filtered signal and coupled to the second signal source for low-pass filtering the second input signal to produce a second filtered signal, the filter being selectively operable in a first mode in which an input signal is filtered within a narrower bandwidth and in a second mode in which an input signal is filtered within a broader bandwidth, wherein the first signal is filtered according to the first mode and the second signal is filtered according to the second mode; a modulator coupled to the filter for modulating the first filtered signal to produce a first modulated signal and the second filtered signal to produce a second 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 for transmitting the second modulated signal, wherein the first modulated signal and the second modulated signal are transmitted substantially simultaneously; 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)
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11. 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; providing a second input signal; low-pass filtering the first input signal to produce a first filtered signal and low-pass filtering the second input signal to produce a second filtered signal, the filtering being performed in one of a first mode and a second mode, in which first mode an input signal is filtered within a narrower bandwidth and in which second mode an input signal is filtered within a broader bandwidth, wherein the first signal is filtered according to the first mode and the second signal is filtered according to the second mode; modulating the first filtered signal to produce a first modulated signal and modulating the second filtered signal to produce a second modulated signal; transmitting the first modulated signal at a required power level as a transmitted signal having a spectral envelope and transmitting the second modulated signal, wherein the first modulated signal and the second modulated signal are transmitted substantially simultaneously; 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 (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. 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 providing a second input signal; means for filtering the first input signal to produce a first filtered signal and for filtering the second input signal to produce a second filtered signal, the means for filtering being selectively operable, in a first mode, to filter an input signal within a narrower bandwidth and, in a second mode, to filter an input signal within a broader bandwidth, wherein the first signal is filtered according to the first mode and the second signal is filtered according to the second mode; means for modulating the first filtered signal to produce a first modulated signal and for modulating the second filtered signal to produce a second modulated signal; means for transmitting the first modulated signal at a required power level as a transmitted signal having a spectral envelope and for transmitting the second modulated signal, wherein the first modulated signal and the second modulated signal are transmitted substantially simultaneously; 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 mod;
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 (22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. 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; provide a second input signal; low-pass filter the first input signal to produce a first filtered signal and low-pass filter the second input signal to produce a second filtered signal, the filtering being performed in one of a first mode and a second mode, in which first mode an input signal is filtered within a narrower bandwidth and in which second mode an input signal is filtered within a broader bandwidth; modulate the first filtered signal to produce a first modulated signal and modulate the second filtered signal to produce a second modulated signal; transmit the first modulated signal at a required power level as a transmitted signal having a spectral envelope and transmit the second modulated signal, wherein the first modulated signal and the second modulated signal are transmitted substantially simultaneously; and control the filtering depending on the required power level such that the first input signal is so filtered in the first mod;
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 (32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A computer program product, comprising:
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non-transitory 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; provide a second input signal; low-pass filter the input signal to produce a first filtered signal and low-pass filter the second input signal to produce a second filtered signal, the filtering being performed in one of a first mode in which an input signal is filtered within a narrower bandwidth and a second mode in which an input signal is filtered within a broader bandwidth, wherein the first signal is filtered according to the first mode and the second signal is filtered according to the second mode; modulate the first filtered signal to produce a first modulated signal and modulate the second filtered signal to produce a second modulated signal; transmit the first modulated signal at a required power level as a transmitted signal having a spectral envelope and transmit the second modulated signal, wherein the first modulated signal and the second modulated signal are transmitted substantially simultaneously; and control the filtering depending on the required power level such that the first input signal is so filtered in the first mod;
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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Specification