Multi-modulation radio communications
First Claim
1. A radio comprising:
- a multi-modulation modem, wherein the multi-modulation modem comprises;
a modulator that modulates signals using a plurality of modulations on a burst-by-burst basis; and
a demodulator that demodulates received signals having been modulated using said plurality of modulations, wherein said demodulator comprises;
an acquisition, wherein said acquisition section comprises;
a precorrelation filter; and
a burst detector and parameter estimator unit coupled to the precorrelation filter; and
a tracking section, wherein the tracking section comprises;
an automatic gain control;
an equalizer and phase rotator unit coupled to the automatic gain control;
a multi-modulation slicer coupled to the equalizer and phase rotator unit, wherein the multi-modulation slicer maps said received signals to a respective one of a plurality of constellations, and each of said plurality of constellations corresponds to respective ones of said plurality of modulations; and
a carrier recovery loop coupled to multi-modulation slicer and the equalizer and phase rotator unit;
a frequency converter coupled to the multi-modulation modem for converting the signals to a radio frequency; and
a transceiver unit including an antennae coupled to the frequency converter for transmitting the signals over a radio communications link.
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Accused Products
Abstract
A radio, and related methods of radio communication, consisting of a multi-modulation modem, wherein the multi-modulation modem that modulates and demodulates signals using a plurality of modulations. The radio also comprises a frequency converter coupled to the multi-modulation modem for converting the signals to a radio frequency and a transceiver unit including an antenna coupled to the frequency converter for transmitting the signals over a radio communications link. The multi-modulation modem includes a modulator that includes a modulation selector unit that selects respective ones of the plurality of modulations to modulate the signals. The multi-modulation modem also includes a demodulator for demodulating the signals having been modulated using the plurality of modulations.
171 Citations
9 Claims
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1. A radio comprising:
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a multi-modulation modem, wherein the multi-modulation modem comprises;
a modulator that modulates signals using a plurality of modulations on a burst-by-burst basis; and
a demodulator that demodulates received signals having been modulated using said plurality of modulations, wherein said demodulator comprises;
an acquisition, wherein said acquisition section comprises;
a precorrelation filter; and
a burst detector and parameter estimator unit coupled to the precorrelation filter; and
a tracking section, wherein the tracking section comprises;
an automatic gain control;
an equalizer and phase rotator unit coupled to the automatic gain control;
a multi-modulation slicer coupled to the equalizer and phase rotator unit, wherein the multi-modulation slicer maps said received signals to a respective one of a plurality of constellations, and each of said plurality of constellations corresponds to respective ones of said plurality of modulations; and
a carrier recovery loop coupled to multi-modulation slicer and the equalizer and phase rotator unit;
a frequency converter coupled to the multi-modulation modem for converting the signals to a radio frequency; and
a transceiver unit including an antennae coupled to the frequency converter for transmitting the signals over a radio communications link.
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2. A modem comprising:
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a multi-modulation modem comprising;
a modulator including a modulation selector unit, wherein the modulator modulates signals using a plurality of modulations, wherein the modulation selector unit selects respective ones of the plurality of modulations to modulate the signals on a burst-by-burst basis; and
a demodulator for demodulating the signals using a plurality of modulation modes, wherein said modulation selector unit comprises;
a byte to symbol converter;
a burst formatter coupled to the byte to symbol converter for formatting said signals into bursts; and
a constellation lookup unit coupled to the burst formatter for mapping respective signals into respective ones of a plurality of constellations, wherein each of the plurality of constellations corresponds to a respective one of said plurality of modulations;
a transmit buffer interface;
a scrambler coupled to a transmit buffer interface;
an encoder coupled to the scrambler;
said modulation selector unit coupled to the encoder;
a pulse shaper coupled to said modulation selector unit;
a halfband filter coupled to the pulse shaper;
a ramper coupled to the halfband filter;
a linearizer coupled to the ramper;
an intermediate frequency modulator coupled to the linearizer; and
a sync distortion compensation filter coupled to the intermediate frequency modulator.
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3. A modem comprising:
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a multi-modulation modem comprising;
a modulator including a modulation selector unit, wherein the modulator modulates signals using a plurality of modulations, wherein the modulation selector unit selects respective ones of the plurality of modulations to modulate the signals on a burst-by-burst basis; and
a demodulator for demodulating the signals using a plurality of modulation modes, wherein said demodulator includes an acquisition section and a tracking section coupled to the acquisition section, and the tracking section demodulates received signals having been modulated with said plurality of modulations;
wherein said tracking section comprises;
an equalizer and phase rotator unit, wherein the equalizer and phase rotator unit minimizes intersymbol interference;
a multi-modulation slicer coupled to said equalizer and phase rotator unit, wherein the multi-modulation slicer maps said signals into one of a plurality of constellations, wherein each of the plurality of constellations is associated with one of said plurality of modulations; and
a carrier recovery loop coupled to said multi-modulation slicer and said equalizer and phase rotator unit, wherein the carrier recovery loop recovers suppressed carrier signals using one or more of said plurality of modulations.- View Dependent Claims (4)
a symbol to byte converter coupled to said multi-modulation slicer of said tracking section;
a decoder coupled to said symbol to byte converter;
a descrambler coupled to the decoder; and
an output buffer coupled to the descrambler.
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5. A method of modulation comprising:
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receiving signals into a modulator;
converting the signals to symbols;
formatting the symbols into bursts;
mapping the bursts into respective ones of a plurality of constellations, wherein each of the plurality of constellations corresponds to a respective one of a plurality of modulations;
modulating the bursts using respective ones of the plurality of modulations;
scrambling said signals prior to said converting;
encoding said signals prior to said converting;
interpolating said bursts after said mapping and prior to said modulating;
applying a ramp to said bursts prior to said modulating;
compensating for non-linear distortion in said bursts prior to said modulating; and
compensating for sinc distortion after said modulating.
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6. A radio comprising:
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a multi-modulation modem, wherein the multi-modulation modem comprises;
a modulator that modulates signals using a plurality of modulations; and
a demodulator that demodulates received signals having been modulated using said plurality of modulations, wherein the demodulator comprises;
an acquisition section, wherein the acquisition section comprises;
a precorrelation filter, and a burst detector; and
a parameter estimator unit coupled to the precorrelation filter; and
a tracking section, wherein the tracking section comprises;
an automatic gain control;
an equalizer and phase rotator unit coupled to the automatic gain control;
a multi-modulation slicer coupled to the equalizer and phase rotator unit; and
a carrier recovery loop coupled to the multi-modulation slicer and the equalizer and phase rotator unit, wherein the multi-modulation slicer maps said received signals to a respective one of a plurality of constellations, and each of said plurality of constellations corresponds to respective ones of said plurality of modulations;
a frequency converter coupled to the multi-modulation modem for converting the signals to a radio frequency; and
a transceiver unit including an antennae coupled to the frequency converter for transmitting the signals over a radio communications link.
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7. A modem comprising:
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a multi-modulation modem comprising;
a modulator including a modulation selector unit, wherein the modulator modulates signals using a plurality of modulations, wherein the modulation selector unit selects respective ones of a plurality of modulations to modulate the signals; and
a demodulator for demodulating the signals using the plurality of modulation modes;
the modulation selector unit comprising;
a byte to symbol converter;
a burst formatter coupled to the byte to symbol converter for formatting said signals into bursts; and
a constellation lookup unit coupled to the burst formatter for mapping respective signals into respective ones of a plurality of constellations, wherein each of the plurality of constellations corresponds to a respective one of said plurality of modulations;
a transmit buffer interface;
a scrambler coupled to a transmit buffer interface;
an encoder coupled to the scrambler;
said modulation selector unit coupled to the encoder;
a pulse shaper coupled to said modulation selector unit;
a halfband filter coupled to the pulse shaper;
a ramper coupled to the halfband filter;
a linearizer coupled to the ramper;
an intermediate frequency modulator coupled to the linearizer; and
a sync distortion compensation filter coupled to the intermediate frequency modulator.
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8. A modem comprising:
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a multi-modulation modem comprising;
a modulator including a modulation selector unit, wherein the modulator modulates signals using a plurality of modulations, wherein the modulation selector unit selects respective ones of the plurality of modulations to modulate the signals; and
a demodulator for demodulating the signals using a plurality of modulation modes, wherein the demodulator includes an acquisition selection and a tracking section coupled to the acquisition section, wherein the tracking section demodulates received signals having been modulated with said plurality of modulations;
said tracking section includes;
an equalizer and phase rotator unit, wherein the equalizer and phase rotator unit minimizes intersymbol interference;
a multi-modulation slicer coupled to said equalizer and phase rotator unit, wherein the multi-modulation slicer maps said signals into one of a plurality of constellations, wherein each of the plurality of constellations is associated with one of said plurality of modulations; and
a carrier recovery loop coupled to said multi-modulation slicer and said equalizer and phase rotator unit, wherein the carrier recovery loop recovers suppressed carrier signals using one or more of said plurality of modulations;
a symbol to byte converter coupled to said multi-modulation slicer of said tracking section;
a decoder coupled to said symbol to byte converter;
a descrambler coupled to the decoder; and
an output buffer coupled to the descrambler.
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9. A method of modulation comprising:
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receiving signals into a modulator;
scrambling and encoding the signals;
converting the signals to symbols;
formatting the symbols into bursts;
mapping the bursts into respective ones of a plurality of constellations, wherein each of the plurality of constellations corresponds to a respective one of a plurality of modulations;
interpolating said bursts and applying a ramp to said bursts;
compensating for non-linear distortion in said bursts;
modulating the bursts using respective ones of the plurality of modulations; and
compensating for sync distortion.
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Specification