Ultrawide-band communication system and method
First Claim
1. An impulse radio transmitter, comprising:
- a. a time base to output a periodic timing signal;
b. a subcarrier modulator to receive a subcarrier signal and an information signal and modulate said subcarrier signal using said information signal and output a modulated subcarrier signal;
c. a subcarrier time modulator to modulate said periodic timing signal using said modulated subcarrier signal and output a modulated timing signal;
d. a code source that uses said modulated timing signal to output a coded signal;
e. a code time modulator to time modulate said modulated timing signal using said coded signal and output a modulated, coded timing signal, wherein the modulation of said modulated timing signal provides channelization and spectral smoothing of an impulse radio signal to be generated; and
f. an output stage to generate said impulse radio signal using said modulated, coded timing signal, wherein said impulse radio signal comprises monocycle pulses spaced in time.
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Accused Products
Abstract
An impulse radio communications system using one or more subcarriers to communicate information from an impulse radio transmitter to an impulse radio receiver. The impulse radio communication system is an ultrawide-band time domain system. The use of subcarriers provides impulse radio transmissions added channelization, smoothing and fidelity. Subcarriers of different frequencies or waveforms can be used to add channelization of impulse radio signals. Thus, an impulse radio link can communicate many independent channels simultaneously by employing different subcarriers for each channel. The impulse radio uses modulated subcarrier(s) for time positioning a periodic timing signal or a coded timing signal. Alternatively, the coded timing signal can be summed or mixed with the modulated subcarrier(s) and the resultant signal is used to time modulate the periodic timing signal. Direct digital modulation of data is another form of subcarrier modulation for impulse radio signals. Direct digital modulation can be used alone to time modulate the periodic timing signal or the direct digitally modulated the periodic timing signal can be further modulated with one or more modulated subcarrier signals. Linearization of a time modulator permits the impulse radio transmitter and receiver to generate time delays having the necessary accuracy for impulse radio communications.
201 Citations
19 Claims
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1. An impulse radio transmitter, comprising:
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a. a time base to output a periodic timing signal; b. a subcarrier modulator to receive a subcarrier signal and an information signal and modulate said subcarrier signal using said information signal and output a modulated subcarrier signal; c. a subcarrier time modulator to modulate said periodic timing signal using said modulated subcarrier signal and output a modulated timing signal; d. a code source that uses said modulated timing signal to output a coded signal; e. a code time modulator to time modulate said modulated timing signal using said coded signal and output a modulated, coded timing signal, wherein the modulation of said modulated timing signal provides channelization and spectral smoothing of an impulse radio signal to be generated; and f. an output stage to generate said impulse radio signal using said modulated, coded timing signal, wherein said impulse radio signal comprises monocycle pulses spaced in time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for transmitting impulse radio signals, comprising the steps of:
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(1) modulating a subcarrier signal using an information signal to output a modulated subcarrier signal; (2) time modulating a periodic timing signal using said modulated subcarrier signal to output a modulated timing signal; (3) producing a coded, modulated signal using said modulated timing signal; (4) time modulating said modulated timing signal using said coded, modulated signal to output a modulated, coded timing signal, wherein said modulation of said modulated timing signal provides channelization and spectral smoothing of an impulse radio signal to be generated; and (5) generating said impulse radio signal using said modulated, coded timing signal, wherein said impulse radio signal comprises monocycle pulses spaced in time. - View Dependent Claims (17, 18, 19)
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Specification
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- Resources
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Current AssigneeTime Domain Corporation (Humatics Corporation)
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Original AssigneeTime Domain Corporation (Humatics Corporation)
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InventorsFullerton, Larry W., Cowie, Ivan A.
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Primary Examiner(s)TSE, YOUNG TOI
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Application NumberUS08/949,145Time in Patent Office718 DaysField of Search375/200-204, 375/206-210, 375/259, 375/343, 375/367, 370/320, 370/342, 370/441, 370/515US Class Current375/130CPC Class CodesH04B 1/69 Spread spectrum techniquesH04B 1/707 using direct sequence modul...H04B 1/70753 Partial phase searchH04B 1/708 Parallel implementationH04B 1/71632 Signal aspects H04B1/7172 a...H04B 1/71635 Transmitter aspects H04B1/7...H04B 1/71637 Receiver aspects H04B1/7183...H04B 1/7176 Data mapping, e.g. modulationH04B 1/7183 SynchronisationH04B 14/026 using pulse time characteri...H04B 2001/6908 using time hoppingH04B 2201/70707 Efficiency-related aspectsH04L 27/2601 Multicarrier modulation sys...H04L 27/2602 Signal structureY02D 30/70 in wireless communication n...
