Ultrawide bandwidth system and method for fast synchronization using multiple detection arms
First Claim
1. A method for identifying a phase of an incoming ultrawide bandwidth (UWB) signal at a UWB receiver, comprising the steps of:
- receiving incoming pulses of the incoming UWB signal, adjacent pulses of said incoming pulses arriving at a predetermined interval;
generating first local pulses at a first detecting arm in the UWB receiver;
generating second local pulses at a second detecting arm in the UWB receiver;
correlating the first and second local pulses with the incoming pulses to produce first and second correlation functions, respectively;
selecting one of the first and second detecting arms to identify the phase based on the first and second correlation functions, and to demodulate data from the incoming UWB signal; and
selecting another of the first and second detecting arms to vary its operational phase and continue to correlate the first or second local pulses with the incoming pulses to refine the phase.
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Accused Products
Abstract
A system and method for fast synchronization of an incoming signal with a UWB receiver rapidly. The present invention synchronizes with a UWB receiver with an incoming signal. The present invention correlates a local pulse generated at the receiver with the incoming signal, finds a phase angle in the correlation function that would correspond to a high signal to noise ratio, thereby matching the receiver to the incoming signal phase, and operates the receiver at that phase. Exemplary options of fast synchronization include using multiple detection arms to compare one parameter of the correlation function to a predetermined threshold.
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Citations
28 Claims
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1. A method for identifying a phase of an incoming ultrawide bandwidth (UWB) signal at a UWB receiver, comprising the steps of:
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receiving incoming pulses of the incoming UWB signal, adjacent pulses of said incoming pulses arriving at a predetermined interval; generating first local pulses at a first detecting arm in the UWB receiver; generating second local pulses at a second detecting arm in the UWB receiver; correlating the first and second local pulses with the incoming pulses to produce first and second correlation functions, respectively; selecting one of the first and second detecting arms to identify the phase based on the first and second correlation functions, and to demodulate data from the incoming UWB signal; and selecting another of the first and second detecting arms to vary its operational phase and continue to correlate the first or second local pulses with the incoming pulses to refine the phase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for identifying a phase of an incoming ultrawide bandwidth (UWB) signal at a UWB receiver, comprising:
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an antenna configured to receive incoming pulses of the incoming UWB signal, adjacent pulses of said incoming pulses occurring at a predetermined interval; a first signal generator configured to generate first local pulses; a second signal generator configured to generate second local pulses; a first correlator configured to correlate the incoming pulses with the first local pulses to produce a first correlation function, and configured to demodulate data from the incoming UWB signal; a second correlator configured to correlate the incoming pulses with the second local pulses to produce a second correlation function, and configured to demodulate data from the incoming UWB signal; and a selector configured to select one of the first and second correlators to identify the phase based on the first and second correlation functions and to demodulate data from the incoming UWB signal, and to select another of the first and second correlators to perform a phase refining function. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A system for identifying a phase of an incoming ultrawide bandwidth (UWB) signal at a UWB receiver, comprising:
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means for receiving incoming pulses of the incoming UWB signal, adjacent pulses of said incoming pulses arriving at a predetermined interval; means for generating first local pulses at the UWB receiver; means for correlating the first local pulses with the incoming pulses to produce a first correlation function, and for demodulating data from the incoming UWB signal; means for generating second local pulses at the UWB receiver; means for correlating the second local pulses with the incoming pulses to produce a second correlation function, and for demodulating the data from the incoming UWB signal; and means for selecting one of first and second detecting arms to identify the phase and demodulate the data from the incoming UWB signal based on the first and second correlation functions, and for selecting another of the first and second detecting arms to continue to produce either the first or second correlation function.
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21. A method for identifying a phase of an incoming ultrawide bandwidth (UWB) signal at a UWB receiver, comprising the steps of:
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receiving incoming pulses of the incoming UWB signal, adjacent pulses of said incoming pulses arriving at a predetermined interval; generating local pulses at the UWB receiver; correlating the local pulses with the incoming pulses to produce a correlation function; and selecting one of first and second a detecting arms to identify the phase based on the correlation function, wherein the step of selecting the one of first and second detecting arms to identify the phase based on the correlation function comprises; finding a first correlation value for the first detecting arm that exceeds a predetermined threshold; decreasing the predetermined threshold until the first correlation value is found; finding a second correlation value for the second detecting arm that exceeds the predetermined threshold, after decreasing the predetermined threshold; and comparing the first correlation value to the second correlation value to select the first detecting arm when the first correlation value is greater than the second correlation value, and to select the second detecting arm when the second correlation value is greater than the first correlation value. - View Dependent Claims (22)
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23. A system for identifying a phase of an incoming ultrawide bandwidth (UWB) signal at a UWB receiver, comprising:
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an antenna configured to receive incoming pulses of the UWB signal, adjacent pulses of said incoming pulses occurring at a predetermined interval; a signal generator configured to generate local pulses; a correlator configured to correlate the incoming pulses with the local pulses to produce at least two correlation functions; and a selector configured to select one of first and second a detecting arms to identify the phase based on the at least two correlation functions, wherein the selector comprises; a calculator configured to find a first correlation value selected from the at least two correlation functions for the first detecting arm that exceeds a predetermined threshold and a second correlation value selected from the at least two correlation functions for the second detecting arm that exceeds the predetermined threshold; a subtractor configured to decrease the predetermined threshold until the first correlation value is found; and a comparator configured to compare the first correlation value to the second correlation value to select the first detecting arm when the first correlation value is greater than the second correlation value, and to select the second detecting arm when the second correlation value is greater than the first correlation value. - View Dependent Claims (24)
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25. A method for processing an incoming ultrawide bandwidth (UWB) signal at a UWB receiver, comprising the steps of:
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receiving incoming pulses of the incoming UWB signal; generating first local pulses at the UWB receiver at a first phase in a first detecting arm; correlating the first local pulses with the incoming pulses in the first detecting arm to produce a first correlation function; comparing the first correlation function with a predetermined threshold; tracking the phase of the incoming signal and demodulating data from the incoming UWB signal with the first detecting arm using the first phase, if the first correlation function is greater than the predetermined threshold; generating second local pulses at the UWB receiver at a second phase different from the first phase in a second detecting arm, after comparing the first correlation function with the predetermined threshold; correlating the second local pulses with the incoming pulses to produce a second correlation function; comparing the first correlation function with the second correlation function; and tracking the phase of the incoming signal and demodulating the data from the incoming UWB signal with the second detecting arm using the second phase if the second correlation function is greater than the first correlation function. - View Dependent Claims (26, 27)
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28. A system for processing an incoming ultrawide bandwidth (UWB) signal at a UWB receiver, comprising:
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an antenna configured to receive incoming pulses of the incoming UWB signal; a first detecting arm including; a first signal generator configured to generate first local pulses, and a first tracking correlator configured to correlate the incoming pulses with the first local pulses to produce a first correlation function, and configured to demodulate data from the incoming UWB signal; a second detecting arm including; a second signal generator configured to generate second local pulses; a second tracing correlator configured to correlate the incoming pulses with the second local pulses to produce a second correlation function, and configured to demodulate the data from the incoming UWB signal; and a selector configured to select one of the first and second detecting arms to identify a phase of the incoming UWB signal based on the first and second correlation functions and to demodulate the data from the incoming UWB signal, and configured to select another of the first and second detecting arms to continue to produce either a first or second correlation function.
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Specification