System and method to perform adaptive channel filtering on a radio frequency burst in a cellular
First Claim
1. A multi stage filter to implement an adaptive filtering algorithm, the multi stage filter comprising:
- a first stage filter having a first bandwidth, wherein the first stage filter receives and filters an input signal to produce a first stage output signal;
at least one additional stage filter operably coupled to the first stage filter, wherein the at least one additional stage filter has a second bandwidth, wherein the at least one additional stage filter receives and filters the first stage output signal to produce at least one additional stage output signal; and
a processing module operable to;
determine a first stage performance measurement associated with the first stage output signal;
determine a multi stage performance measurement associated with the at least one additional stage output signal;
compare the first stage performance measurement and the multi stage performance measurement; and
select a first mode of operation wherein the first stage output signal is selected as a multi stage filter output when the first stage performance measurement compares favorably with the multi stage performance measurement;
or select a second mode of operation wherein the at least one additional stage output signal is selected as the multi stage filter output when the first stage performance measurement compares unfavorably with the multi stage performance measurement.
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Abstract
A method to perform adaptive channel filtering on a Radio Frequency (RF) bursts in a cellular wireless communication system. This method first filters an input signal with a first stage filter having a first bandwidth to produce a first stage output signal. Then the first stage output signal is filtered with a second stage filter having a second bandwidth narrower than that of the first stage filter to produce a multi-stage output signal. A comparison between first stage performance measurements and multi-stage performance measurements determine the mode of operation of the adaptive multistage filter. A first mode of operation, selected when the first stage performance measurement compares favorably with the second stage performance measurement, selects the output of the first stage filter as the output of the multi-stage filter. Otherwise, a second mode of operation selects the output of the second stage filter as the output of the multi-stage filter.
29 Citations
33 Claims
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1. A multi stage filter to implement an adaptive filtering algorithm, the multi stage filter comprising:
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a first stage filter having a first bandwidth, wherein the first stage filter receives and filters an input signal to produce a first stage output signal;
at least one additional stage filter operably coupled to the first stage filter, wherein the at least one additional stage filter has a second bandwidth, wherein the at least one additional stage filter receives and filters the first stage output signal to produce at least one additional stage output signal; and
a processing module operable to;
determine a first stage performance measurement associated with the first stage output signal;
determine a multi stage performance measurement associated with the at least one additional stage output signal;
compare the first stage performance measurement and the multi stage performance measurement; and
select a first mode of operation wherein the first stage output signal is selected as a multi stage filter output when the first stage performance measurement compares favorably with the multi stage performance measurement;
orselect a second mode of operation wherein the at least one additional stage output signal is selected as the multi stage filter output when the first stage performance measurement compares unfavorably with the multi stage performance measurement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method to adaptively filter communications, comprising:
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filtering an input signal with a first stage filter having a first bandwidth to produce a first stage output signal;
filtering the first stage output signal with at least one additional stage filter having a second bandwidth to produce a multi stage output signal;
determining a first stage performance measurement associated with the first stage output signal;
determining a multi stage performance measurement associated with the at least one additional stage output signal;
comparing the first stage performance measurement and the multi stage performance measurement; and
selecting a first mode of operation that outputs the first stage output signal as a filtered output, when the first stage performance measurement compares favorably with the at least one additional stage performance measurement;
orselecting a second mode of operation that outputs the multi stage output signal as the filtered output, when the at least one additional stage performance measurement compares unfavorably with the multi stage performance measurement. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A wireless terminal that comprises:
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a Radio Frequency (RF) front end;
a system processor communicatively coupled to the RF front end;
wherein, the RF front end and the system processor are operable to;
receive communication signals transmitted according to a transmission scheme;
adaptively filter the communication signals with a multi stage filter that further comprises;
a first stage filter having a first bandwidth, wherein the first stage filter receives and filters an input signal to produce a first stage output signal;
at least one additional stage filter operably coupled to the first stage filter, wherein the at least one additional stage filter has a second bandwidth, wherein the second stage filter receives and filters the first stage output signal to produce a second stage output signal;
determine a first stage performance measurement associated with the first stage output signal;
determine a multi stage performance measurement associated with the at least one additional stage output signal;
compare the first stage performance measurement and the multi stage performance measurement;
select a first mode of operation wherein the first stage output signal is selected as a multi stage filter output when the first stage performance measurement compares favorably with the at least one additional stage performance measurement;
orselect a second mode of operation wherein the at least one additional stage output signal is selected as the multi stage filter output when the first stage performance measurement compares unfavorably with the multi stage performance measurement;
form a data block from the communication signals; and
decode the data block. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification