Ultrawide-band communication system and method
First Claim
1. An impulse radio receiver, comprising:
- a. a decode source to output a decode control signal;
b. a decode timing modulator that uses said decode control signal and a periodic timing signal to output a decode signal;
c. a cross correlator to cross correlate a received impulse radio signal with said decode signal to output a baseband signal;
d. a lowpass filter that uses said baseband signal to output an error signal;
e. an adjustable time base, responsive to said error signal, to output said periodic timing signal and adjust the phase of said periodic timing signal to control lock of the cross correlation; and
f. a subcarrier demodulator, responsive to said baseband signal, to output a demodulated information signal.
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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.
195 Citations
13 Claims
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1. An impulse radio receiver, comprising:
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a. a decode source to output a decode control signal; b. a decode timing modulator that uses said decode control signal and a periodic timing signal to output a decode signal; c. a cross correlator to cross correlate a received impulse radio signal with said decode signal to output a baseband signal; d. a lowpass filter that uses said baseband signal to output an error signal; e. an adjustable time base, responsive to said error signal, to output said periodic timing signal and adjust the phase of said periodic timing signal to control lock of the cross correlation; and f. a subcarrier demodulator, responsive to said baseband signal, to output a demodulated information signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An impulse radio receiver, comprising:
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a. a decode source to output a decode control signal; b. a decode timing modulator, responsive to said decode control signal, a periodic timing signal and a triggerable waveform generator to output a decode signal; c. a cross correlator to cross correlate a received impulse radio signal with said decode signal to output a baseband signal; d. a plurality of bandpass filters, responsive to said baseband signal, to output a plurality of subcarrier signals; and e. a plurality of phase locked loops, responsive to said plurality of bandpass filters, respectively, to output a plurality of information signals.
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8. A method for receiving impulse radio signals, comprising the steps of:
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(1) providing a decode control signal; (2) providing a periodic timing signal; (3) producing a decode signal using said decode control signal and said periodic;
timing signal;(4) cross correlating a received impulse radio signal with said decode signal to output a baseband signal; (5) demodulating said baseband signal to output a subcarrier signal; and (6) demodulating said subcarrier signal to output an information signal. - View Dependent Claims (9, 10, 11, 12)
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13. A method for receiving impulse radio signals, comprising the steps of:
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(1) providing a decode control signal; (2) providing a periodic timing signal; (3) producing a decode signal using said decode control signal and said periodic timing signal; (4) cross correlating a received impulse radio signal with said decode signal to output a baseband signal; (5) lowpass filtering said baseband signal to output a plurality of subcarrier signals; and (6) demodulating said plurality of subcarrier signals to output a plurality of information signals.
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Specification
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- Resources
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Current AssigneeAlereon Incorporated (PNG Telecommunications, Inc.)
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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 NumberUS08/949,143Time in Patent Office725 DaysField of Search375/200-204, 375/206-210, 375/259, 375/343, 375/367, 370/320, 370/342, 370/441, 370/515, 370/204, 370/213US Class Current375/131CPC 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...
