Fast locking mechanism for channelized ultrawide-band communications
First Claim
1. A method for acquisition and lock of an ultra wideband signal, comprising the steps of:
- sliding a periodic timing signal using an adjustable time base;
producing a decode signal using said periodic timing signal, wherein successive decode signals are coded by successive chips of a code having a predetermined modulo length;
cross correlating a received ultra wideband signal with said decode signal to output a baseband signal;
integrating T samples of said baseband signal to output an integration result, where T is an integer;
comparing said integration result with a threshold value to output a channel coincidence signal;
determining whether channel coincidence has occurred using said channel coincidence signal, and if channel coincidence is detected, outputting a constant rate-control signal to stop said periodic timing signal from sliding, otherwise, if channel coincidence was not detected, adjusting said periodic timing signal and repeating the steps of sliding, producing, cross correlating, integrating, comparing and determining for successive T pulses of said periodic timing signal until channel coincidence is detected.
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Abstract
A receiver for acquisition and lock of an impulse radio signal comprising an adjustable time base to output a sliding periodic timing signal having an adjustable repetition rate, and a decode timing modulator to output a decode signal in response to the periodic timing signal. The impulse radio signal is cross correlated with the decode signal to output a baseband signal. The receiver integrates T samples of the baseband signal and a threshold detector uses the integration results to detect channel coincidence. A receiver controller stops sliding the time base when channel coincidence is detected. A counter and extra count logic, coupled to the controller, are configured to increment or decrement the address counter by a one or more extra counts after each T pulses is reached in order to shift the PN code modulo for proper phase alignment of the periodic timing signal and the received impulse radio signal.
38 Citations
15 Claims
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1. A method for acquisition and lock of an ultra wideband signal, comprising the steps of:
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sliding a periodic timing signal using an adjustable time base;
producing a decode signal using said periodic timing signal, wherein successive decode signals are coded by successive chips of a code having a predetermined modulo length;
cross correlating a received ultra wideband signal with said decode signal to output a baseband signal;
integrating T samples of said baseband signal to output an integration result, where T is an integer;
comparing said integration result with a threshold value to output a channel coincidence signal;
determining whether channel coincidence has occurred using said channel coincidence signal, and if channel coincidence is detected, outputting a constant rate-control signal to stop said periodic timing signal from sliding, otherwise, if channel coincidence was not detected, adjusting said periodic timing signal and repeating the steps of sliding, producing, cross correlating, integrating, comparing and determining for successive T pulses of said periodic timing signal until channel coincidence is detected. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A receiver for acquisition and lock of an ultra wideband signal, comprising:
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an adjustable time base to output a sliding periodic timing signal having an adjustable repetition rate;
a decode timing modulator to output a decode signal in response to said periodic timing signal;
a cross correlator to cross correlate the ultra wideband signal with said decode signal and output a baseband signal;
first means for integrating T samples of said baseband signal to output an integration result, where T is an integer;
a threshold detector to compare said integration result with a threshold value to output a channel coincidence signal; and
a controller to determine whether channel coincidence has occurred using said channel coincidence signal, and if channel coincidence is detected, to output a constant rate-control signal to stop said periodic timing signal from sliding, otherwise, if channel coincidence was not detected, to adjust said periodic timing signal, wherein said means for integrating and said threshold detector continue to integrate and threshold detect successive trials of T pulses of said periodic timing signal until channel coincidence is detected. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification