Transmitting and receiving spread spectrum signals using continuous waveforms
First Claim
1. An apparatus, comprising a spread spectrum transmitter including:
- a comb generator, wherein the comb generator is operable to generate a plurality of harmonics;
a summing node coupled to the comb generator;
a modulator coupled to the summing node and operable to modulate a first one or more of the plurality of harmonics such that a transmitted signal substantially conforms to a first PSD profile during a first time period and modulate a second one or more of the plurality of harmonics such that a transmitted signal substantially conforms to a second PSD profile in a second time period, wherein the PSD of the transmitted signal during the first time period is the result of the modulation of the first one or more of the plurality of harmonics and the PSD of the transmitted signal during the second time period is the result of the modulation of the second one or more of the plurality of harmonics, the first one or more of the plurality of harmonics is determined based on the first PSD profile, the second one or more of the plurality of harmonics is determined based on the second PSD profile and the first one or more of the plurality of harmonics is different than the second one or more of the plurality of harmonics;
a spread spectrum signal output coupled to the modulator;
a data encoder coupled to the modulator;
a data input coupled to the data encoder;
a code source coupled to the data encoder; and
a clock coupled to both the data encoder and the comb generator, such that both the data encoder and the comb generator share a common frequency reference.
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Abstract
Systems and methods are described for transmitting and receiving spread spectrum signals using continuous waveforms. A method of transmitting a spread spectrum signal includes: generating a plurality of substantially continuous waveforms; summing the plurality of substantially continuous waveforms; modulating the summed plurality of substantially continuous waveforms to generate the spread spectrum signal; and transmitting the spread spectrum signal. A method of receiving a spread spectrum signal includes: generating a plurality of substantially continuous waveforms; summing the plurality of substantially continuous waveforms; modulating the summed plurality of substantially continuous waveforms with a code; mixing the modulated summed plurality of substantially continuous waveforms with the spread spectrum signal to produce a baseband signal; integrating the baseband signal; and detecting data.
79 Citations
22 Claims
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1. An apparatus, comprising a spread spectrum transmitter including:
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a comb generator, wherein the comb generator is operable to generate a plurality of harmonics; a summing node coupled to the comb generator; a modulator coupled to the summing node and operable to modulate a first one or more of the plurality of harmonics such that a transmitted signal substantially conforms to a first PSD profile during a first time period and modulate a second one or more of the plurality of harmonics such that a transmitted signal substantially conforms to a second PSD profile in a second time period, wherein the PSD of the transmitted signal during the first time period is the result of the modulation of the first one or more of the plurality of harmonics and the PSD of the transmitted signal during the second time period is the result of the modulation of the second one or more of the plurality of harmonics, the first one or more of the plurality of harmonics is determined based on the first PSD profile, the second one or more of the plurality of harmonics is determined based on the second PSD profile and the first one or more of the plurality of harmonics is different than the second one or more of the plurality of harmonics; a spread spectrum signal output coupled to the modulator; a data encoder coupled to the modulator; a data input coupled to the data encoder; a code source coupled to the data encoder; and a clock coupled to both the data encoder and the comb generator, such that both the data encoder and the comb generator share a common frequency reference. - View Dependent Claims (2, 3, 21)
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4. An apparatus, comprising a spread spectrum signal receiver including:
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a comb generator, wherein the comb generator is operable to generate a plurality of harmonics; a summing node coupled to the comb generator; a modulator coupled to the summing node and operable to modulate a first set of the plurality of harmonics such that a transmitted signal substantially conforms to a first PSD profile during a first time period and modulate a second set of the plurality of harmonics such that a transmitted signal substantially conforms to a second PSD profile in a second time period wherein the PSD of the transmitted signal during the first time period is the result of the modulation of the first set of the plurality of harmonics and the PSD of the transmitted signal during the second time period is the result of the modulation of the second set of the plurality of harmonics, the first set of the plurality of harmonics is determined based on the first PSD profile, the second set of the plurality of harmonics is determined based on the second PSD profile and the first set of the plurality of harmonics is different than the second set of the plurality of harmonics; a code source circuit coupled to the modulator; a clock coupled to both the code source circuit and the comb generator, such that both a data encoder and the comb generator share a common frequency reference; a multiplier coupled to the modulator; a spread spectrum signal input coupled to the multiplier; an integration circuit coupled to the multiplier; and a data output coupled to the integration circuit. - View Dependent Claims (5, 6, 7)
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8. A method for transmitting a spread spectrum signal, including:
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generating a plurality of harmonics of a reference clock via a comb generator, wherein the plurality of harmonics are synchronized with the reference clock; selecting a first set of the harmonics based on a first power spectral density (PSD) profile; selecting a second set of the harmonics based on a second power spectral density (PSD) profile, wherein the first set of the plurality of harmonics is different than the second set of the plurality of harmonics; modulating the selected first set of harmonics with data during a first time period to generate a first spread spectrum signal such that the first spread spectrum signal conforms to the first PSD profile during the first time period, wherein the PSD of the first spread spectrum signal is the result of the modulation of the selected first set of harmonics; transmitting the first spread spectrum signal; modulating the selected second set of harmonics with data during a second time period to generate a second spread spectrum signal such that the second spread spectrum signal conforms to the second PSD profile during the second time period, wherein the PSD of the second spread spectrum signal is the result of the modulation of the selected second set of harmonics; and transmitting the second spread spectrum signal. - View Dependent Claims (9, 10, 11, 16, 17, 18, 19, 20, 22)
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12. An apparatus for transmitting a spread spectrum signal, comprising:
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a reference clock operable to generate a reference signal; a harmonic comb generator operable to generate a plurality of harmonics of the reference clock which are synchronous with the reference clock; logic operable to select a first set of harmonics based on a first power spectral density (PSD) profile and a second set of harmonics based on a second PSD profile, wherein the first set of harmonics is different than the second set of harmonics; a mixer operable to modulate the first set of harmonics with a data signal to generate a spread spectrum signal which substantially conforms to the first power spectral density (PSD) profile during a first time period, wherein the spread spectrum signal substantially conforms to the first PSD profile during the first time period as result of the modulation of the first set of harmonics, and modulate the second set of the plurality of harmonics with the data signal to generate the spread spectrum signal which substantially conforms to the second PSD profile during a second time period, wherein the spread spectrum signal substantially conforms to the second PSD profile during the second time period as a result of the modulation of the second set of harmonics; and an antenna operable to transmit the spread spectrum signal. - View Dependent Claims (13, 14, 15)
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Specification