METHODS AND SYSTEMS TO DIGITALLY SWITCH BETWEEN FREQUENCIES AND CORRESPONDING BANDWIDTHS IN A TRANSCEIVER
First Claim
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1. A system, comprising:
- a receive tuner, tuned with respect to a first frequency, to down-convert a first modulated signal having a first bandwidth centered about the first frequency to baseband components centered about zero Hertz (Hz), and to down-convert a second modulated signal having a second bandwidth centered about a second frequency to a relatively low intermediate frequency (IF);
an analog-to-digital converter (ADC) to digitize outputs of the receive tuner; and
digital baseband processor including a multi-mode digital demodulator to demodulate data output from the ADC within a bandwidth that encompasses the first and second bandwidths, wherein the demodulator is digitally controllable to operate at zero Hz with respect to the first signal, and to operate at the intermediate frequency with respect to the second signal.
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Abstract
Methods and systems to maintain a tuner at a fixed frequency and to switch between frequencies and bandwidths in a digital domain. IQ imbalance equalization coefficients may be determined with respect to a frequency and bandwidth of a first signal, and the coefficients may be applied to baseband data associated with one or more other frequencies and/or bandwidths. Methods and systems disclosed herein may be applied in a multi-mode Multimedia over Coax Alliance (MoCA) environment, such as to digitally switch between a MoCA 2 standard and a MoCA 1.x standard.
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Citations
20 Claims
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1. A system, comprising:
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a receive tuner, tuned with respect to a first frequency, to down-convert a first modulated signal having a first bandwidth centered about the first frequency to baseband components centered about zero Hertz (Hz), and to down-convert a second modulated signal having a second bandwidth centered about a second frequency to a relatively low intermediate frequency (IF); an analog-to-digital converter (ADC) to digitize outputs of the receive tuner; and digital baseband processor including a multi-mode digital demodulator to demodulate data output from the ADC within a bandwidth that encompasses the first and second bandwidths, wherein the demodulator is digitally controllable to operate at zero Hz with respect to the first signal, and to operate at the intermediate frequency with respect to the second signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system, comprising:
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a digital baseband processor including a multi-mode digital modulator, digitally controllable to modulate data in a selected one of first and second modes, wherein the first mode corresponds to a first bandwidth centered about zero Hz and the second mode corresponds to a second bandwidth centered about a relatively low intermediate frequency (IF); a digital-to-analog converter (DAC) to digitize outputs of the digital modulator; and a transmit tuner, tuned with respect to a first frequency, to frequency up-convert first mode outputs of the DAC to the first frequency and to frequency up-convert second mode outputs of the DAC to a second frequency equal to a sum of the first frequency and the IF. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A method, comprising:
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receiving a first modulated signal having a first bandwidth centered about a first frequency and a second modulated signal having a second bandwidth centered about a second frequency, wherein the first bandwidth encompasses the second bandwidth, and wherein the first and second frequencies differ by a relatively small intermediate frequency (IF); frequency down-converting the first and second modulated signals by the first frequency; digitizing results of the down-converting; digitally selecting a first receive mode to process the first signal and a second receive mode to process the second signal; digitally demodulating the digitized results within the first bandwidth centered about zero Hertz (Hz) during the first receive mode; and digitally demodulating the digitized results within the first bandwidth centered about the IF during the second receive mode. - View Dependent Claims (19, 20)
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Specification