Broadband modulation/demodulation apparatus and a method thereof
First Claim
1. A modulator/demodulator system comprising:
- a transmission system which applies one of a plurality of time scales and one of a plurality of time delays to one of a pair of substantially matched base signals, combines the time scaled and time delayed base signal with the other one of the pair of base signals to form a doublet, and transmits the doublet; and
a receiving system which receives the doublet and extracts information from the doublet based on the one of the plurality of time scales and the one of the plurality of time delays which were applied.
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Accused Products
Abstract
A modulator/demodulator apparatus and method for applications, such as communications, active sensing and navigation is disclosed. The modulator time-delays and time-scales (compresses or dilates) an arbitrary, noise-like “base signal,” then it sums this time-scaled and time-delayed version of the base signal with the original base signal to create a “signal pair” or doublet. The two signals in the doublet are completely overlapped in time and frequency. This doublet creation process can be repeated (with different base signals and/or different time-scale/time-delay parameters) and multiple doublets can be summed together and simultaneously transmitted. This demodulator uses the applied differential time-scale and differential time-delay to extract information, such as a message or a radar image, from the doublet.
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Citations
98 Claims
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1. A modulator/demodulator system comprising:
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a transmission system which applies one of a plurality of time scales and one of a plurality of time delays to one of a pair of substantially matched base signals, combines the time scaled and time delayed base signal with the other one of the pair of base signals to form a doublet, and transmits the doublet; and
a receiving system which receives the doublet and extracts information from the doublet based on the one of the plurality of time scales and the one of the plurality of time delays which were applied. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A modulation/demodulation method comprising:
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applying one of a plurality of time scales and one of a plurality of time delays to one of a pair of substantially matched base signals;
combining the time scaled and time delayed base signal with the other one of the pair of base signals to form a doublet;
transmitting the doublet into the environment;
receiving the doublet; and
extracting information from the doublet based on the one of the plurality of time scales and on the one of the plurality of time delays which were applied. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A modulation/demodulation system comprising:
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a transmission system which applies one of a plurality of time scales to one of a pair of substantially matched base signals, combines the time scaled base signal with the other one of the pair of base signals to form a doublet, and transmits the doublet; and
a receiving system which receives the doublet and extracts information from the doublet based on the one of the plurality of time scales which was applied. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A modulation/demodulation method comprising:
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applying one of a plurality of time scales to one of a pair of substantially matched base signals;
combining the time scaled base signal with the other one of the pair of base signals to form a doublet;
transmitting the doublet into the environment;
receiving the doublet; and
extracting information from the doublet based on the one of the plurality of time scales which was applied. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. A transmission system for transmitting information comprising:
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an encoding system which applies one of a plurality of time scales to one of a pair of substantially matched base signals;
a combiner which combines the time scaled base signal with the other one of the pair of base signals to form a doublet; and
a transmitter which transmits the doublet with the information. - View Dependent Claims (43, 44, 45, 46, 47)
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48. A method for transmitting information comprising:
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applying one of a plurality of time scales to one of a pair of substantially matched base signals;
combining the time scaled with the other one of the pair of base signals to form a doublet with the information; and
transmitting the doublet. - View Dependent Claims (49, 50, 51, 52, 53, 54)
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55. A receiver system for receiving transmitted information comprising:
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a receiver which receives a doublet wherein the doublet comprises a combined pair of substantially matched base signals and wherein one of a plurality of time scales was applied to at least one of the pair of substantially matched base signals; and
a processing system which extracts the information from the doublet based on the one of the plurality of time scales which was applied to the doublet prior to transmission. - View Dependent Claims (58)
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56. A receiver system for receiving transmitted information comprising:
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a receiver which receives a doublet; and
a processing system which extracts the information from the doublet based on one of a plurality of time scales which was applied to the doublet prior to transmission;
wherein the receiver further comprises a device that time scales a received signal from the doublet by the time scale that was applied to form a time scaled version of the received signal, a correlator that correlates the received signal with the time scaled version of the received signal to form a time delay correlation signal, a detector that detects the peaks of this time delay correlation signal, and an estimator that uses the time delay locations of the peaks to estimate the angle of arrival of each of the received signals.
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57. A receiver system for receiving transmitted information comprising:
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a receiver which receives a doublet; and
a processing system which extracts the information from the doublet based on one of a plurality of time scales which was applied to the doublet prior to transmission;
wherein the receiver receives a plurality of the doublets in a composite signal and the processing system extracts the information from the composite signal based on the one of the plurality of time scales which was applied to each of the doublets.
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59. A receiver system for receiving transmitted information comprising:
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a receiver which receives a doublet; and
a processing system which extracts the information from the doublet based on one of a plurality of time scales which was applied to the doublet prior to transmission;
wherein the processing system further comprises;
a segmentation device that receives the doublet and forms received segments from the received doublet;
a time scaling device which applies at least one of the plurality of time scales to each of the received segments to form time scaled signal segments;
a time delaying device which applies at least one of the plurality of time delays to each of the received segments to form time delayed signal segments;
a multiplier which multiplies each of the time scaled signal segments with each of the time delayed signal segments to form multiplied signals; and
an integrator which integrates the multiplied signals across time to form detection signals, the processing system comparing the detection signals at different ones of the plurality of time scales and different ones of the plurality of time delays over time to determine the applied one of the plurality of time scales and the applied one of the plurality of time delays to extract the information from the detection signal.
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60. A receiver system for receiving transmitted information comprising:
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a receiver which receives a doublet; and
a processing system which extracts the information from the doublet based on one of a plurality of time scales which was applied to the doublet prior to transmission;
wherein the receiver further comprises;
a temporal equalizer which substantially assures that signal energy of the pair of substantially matched base signals is evenly distributed across the duration of the pair of substantially matched base signals; and
a spectral equalizer which substantially assures that the signal energy is evenly distributed across the spectrum of the pair of substantially matched base signals.
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61. A receiving method for receiving information comprising:
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receiving a doublet, wherein the doublet comprises a combined pair of substantially matched base signals and wherein one of a plurality of time scales was applied to at least one of the pair of substantially matched base signals; and
extracting information from the doublet based on the one of the plurality of time scales which was applied to the doublet. - View Dependent Claims (63, 64)
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62. A receiving method for receiving information comprising:
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receiving a plurality of doublets contained in a composite signal; and
extracting information from the composite signal based on one of a plurality of time scales which was applied to each of the doublets.
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65. A receiving method for receiving information comprising:
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receiving a doublet; and
extracting information from the doublet based on one of a plurality of time scales which was applied to the doublet;
wherein the information comprises imaging data embedded by an environment in which the doublet was transmitted.
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66. A receiving method for receiving information comprising:
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receiving a doublet; and
extracting information from the doublet based on one of a plurality of time scales which was applied to the doublet;
wherein the extracting further comprises;
segmenting the received doublet to form received segments;
applying at least one of the plurality of time scales to each of the received segments to form time scaled signal segments;
applying at least one of the plurality of time delays to each of the received segments to form time delayed signal segments;
multiplying each of the time scaled signal segments with each of the time delayed signal segments to form multiplied signals; and
integrating the multiplied signals across time to form detection signals, wherein the extracting further comprises processing the detection signals at different ones of the plurality of time scales and different ones of the plurality of time delays over time to determine the applied one of the plurality of time scales and the applied one of the plurality of time delays to extract the information from the determined detection signal.
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67. A receiving method for receiving information comprising:
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receiving a doublet comprising a combined pair of substantially matched base signals;
extracting information from the doublet based on one of a plurality of time scales which was applied to the doublet;
substantially assuring that signal energy of the pair of substantially matched base signals is evenly distributed across the duration of the pair of substantially matched base signals following the receiving; and
substantially assuring that the signal energy is evenly distributed across the spectrum of the pair of substantially matched base signals following the receiving.
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68. A receiving method for receiving information comprising:
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receiving a doublet comprising a combined pair of substantially matched base signals; and
extracting information from one of the pair of substantially matched base signals in the doublet based on one of a plurality of time scales which was applied to the doublet.
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69. A communication system comprising:
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a transmission system embeds communication information by applying one of a plurality of time scales and one of a plurality of time delays to one of a pair of substantially matched base signals, combines the time scaled and time delayed base signal with the other one of the pair of base signals to form a doublet, and transmits the doublet; and
a receiving system which receives the doublet and extracts information from the doublet based on the one of the plurality of time scales and the one of the plurality of time delays which were applied. - View Dependent Claims (70, 71, 72, 73, 74, 75, 76)
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77. A method for communicating comprising:
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applying one of a plurality of time scales and one of a plurality of time delays to one of a pair of substantially matched base signals to embed communication information;
combining the time scaled and time delayed base signal with the other one of the pair of base signals to form a doublet;
transmitting the doublet into the environment;
receiving the doublet; and
extracting the communication information from the doublet based on the one of the plurality of time scales and on the one of the plurality of time delays which were applied. - View Dependent Claims (78, 79, 80, 81, 82, 83)
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84. An imaging system comprising:
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a transmission system which applies one of a plurality of time scales and one of a plurality of time delays to one of a pair of substantially matched base signals, combines the time scaled and time delayed base signal with the other one of the pair of base signals to form a doublet, and transmits the doublet into an environment which embeds imaging information in the doublet; and
a receiving system which receives the doublet and extracts the imaging information from the doublet based on the one of the plurality of time scales and the one of the plurality of time delays which were applied. - View Dependent Claims (85, 86, 87, 88, 89, 90, 91)
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92. A method for imaging comprising:
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applying one of a plurality of time scales and one of a plurality of time delays to one of a pair of substantially matched base signals;
combining the time scaled and time delayed base signal with the other one of the pair of base signals to form a doublet;
transmitting the doublet into the environment that embeds the imaging information;
receiving the doublet; and
extracting the imaging information from the doublet based on the one of the plurality of time scales and on the one of the plurality of time delays which were applied. - View Dependent Claims (93, 94, 95, 96, 97, 98)
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Specification