Orthogonal chirp modulation in multipath environments
First Claim
1. A communication system comprising:
- a base station operative to generate a chirp signal according to a chirp rate selected to reduce bandwidth usage and to reduce transmission errors, the base station being operative to transmit the chirp signal, the chirp signal being substantially orthogonal to delayed versions of the transmitted chirp signal; and
a receiving station operative to receive an incoming signal, the incoming signal including the chirp signal.
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Accused Products
Abstract
Methods and systems for communication systems are disclosed. Chirp signals generated according to a chirp rate and carrier frequency are used for communication. The chirp rate can be determined by solving integrals or by simulation of transmission parameters. A chirp signal is transmitted from a base station and delayed versions of the chirp signals are created. The delayed versions are generated by the chirp signal reflecting off of reflectors. A receiving station receives an incoming signal. The incoming signal includes the LOS signal plus delayed versions, noise and/or interference. Unwanted signals, either LOS or delayed versions, noise and/or interference are removed from the incoming signal to obtain the desired chirp signal. Using the chirp rate, the chirp signal is converted to a corresponding digital signal.
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Citations
32 Claims
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1. A communication system comprising:
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a base station operative to generate a chirp signal according to a chirp rate selected to reduce bandwidth usage and to reduce transmission errors, the base station being operative to transmit the chirp signal, the chirp signal being substantially orthogonal to delayed versions of the transmitted chirp signal; and
a receiving station operative to receive an incoming signal, the incoming signal including the chirp signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A communication system comprising:
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means for creating a chirp signal such that delayed versions of the chirp signal are substantially orthogonal to the chirp signal;
means for transmitting the chirp signal;
means for receiving an incoming signal comprising the chirp signal; and
means for removing unwanted signals from the incoming signal to obtain the chirp signal.
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9. A transmitter chirp generator system comprising:
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a chirp rate determiner operative to receive input data having at least one input signal, to determine a chirp rate for the at least one input signal and to generate a composite signal for the at least one input signal; and
an inverse transform operative to perform an inverse transform on the composite signal to generate a digital chirp signal. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A receiver matched filter system comprising:
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a matched filter operative to receive an input signal and to demodulate the input signal according to a stored signal template to obtain a digital data signal, the input signal including a chirp signal, the chirp signal being relatively narrowband and substantially orthogonal to delayed versions of the chirp signal in the input signal; and
a signal template generator operative to determine the signal template and to provide the signal template to the matched filter, the signal template including signal template parameters associated with the chirp signal. - View Dependent Claims (17, 18, 19)
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20. A transceiver device comprising:
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a transmitter chirp filter comprising;
a chirp rate determiner operative to determine a first chirp rate; and
a signal converter operative to convert an input signal to a first chirp signal according to the first chirp rate and a first carrier frequency; and
a receiver chirp filter comprising;
a receive filter operative to receive an input signal and to demodulate the input signal according to a second carrier frequency and a second chirp rate to obtain an analog signal, the input signal including a second chirp signal, the second chirp signal being relatively narrowband and substantially orthogonal to delayed versions of the second chirp signal; and
a chirp rate component operative to determine the second chirp rate and provide the second chirp rate to the receive filter. - View Dependent Claims (21, 22)
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23. A method of operating a communications system comprising:
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determining at least one of a chirp rate, baud time, carrier frequency, and modulation;
generating a digital chirp signal according to the at least one of chirp rate, baud time, carrier frequency, and modulation; and
transmitting the digital chirp signal, the transmitted chirp signal being substantially orthogonal to delayed versions of the transmitted chirp signal. - View Dependent Claims (24, 25, 26, 27)
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28. A method of simulating a chirp signal comprising:
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determining transmission parameters for a desired implementation, the transmission parameters including an estimated chirp rate and a differential path delay;
generating a desired signal from the transmission parameters such that delayed versions of the desired signal are substantially orthogonal to the desired signal;
generating at least one delayed signal from the desired signal, where the at least delayed signal is a delayed version of the desired signal; and
generating a nearly worst case delayed signal from the desired signal, where the nearly worst case delayed signal is a nearly worst case delayed version of the desired signal;
simulating transmission and reception of the desired signal, the at least one delayed signal and the nearly worst case delayed signal; and
determining acceptability of the estimated chirp rate. - View Dependent Claims (29, 30, 31, 32)
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Specification