Method and system for reducing potential interference in an impulse radio
First Claim
1. A method of reducing potential interference in an impulse radio receiver, comprising the steps of:
- (a) receiving a signal including an impulse signal, the impulse signal including a sequence of impulses spaced in time from one another;
(b) sampling the sequence of impulses at a sequence of data sample times to produce a sequence of data samples;
(c) sampling the received signal at a time offset from each of the data sample times to produce a nulling sample corresponding to each of the data samples, thereby producing a sequence of nulling samples corresponding to the time offset;
(d) separately combining each of the data samples with a corresponding nulling sample from the sequence of nulling samples to produce a sequence of adjusted samples corresponding to the time offset;
(e) determining a first quality metric associated with the sequence of adjusted samples;
(f) determining a second quality metric associated with the sequence of data samples; and
(g) selecting a preferred sequence of samples based on the first and second quality metrics.
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Accused Products
Abstract
Potential interference is reduced in an impulse radio. A signal including an impulse signal and potential interference is received by the impulse radio. The impulse signal includes a sequence of impulses. The sequence of impulses of the received signal is sampled at a sequence of data sample times to produce a sequence of data samples. The received signal is also sampled at a plurality of time offsets from each of the data sample times to produce a plurality of nulling samples corresponding to each of the data samples. A separate sequence of nulling samples for each of the time offsets is thereby produced. Each of the data samples is then separately combined with a corresponding nulling sample from each of the separate sequences of nulling samples to produce a separate sequence of adjusted samples corresponding to each of the time offsets. A separate quality metric, representative of a signal-to-interference level, is then determined for each of the separate sequences of adjusted samples. A preferred sequence of samples is selected for further signal processing based on the determined quality metrics. Alternatively or additionally, one of the plurality of time offsets is selected as the preferred time offset based on the determined quality metrics.
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Citations
87 Claims
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1. A method of reducing potential interference in an impulse radio receiver, comprising the steps of:
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(a) receiving a signal including an impulse signal, the impulse signal including a sequence of impulses spaced in time from one another;
(b) sampling the sequence of impulses at a sequence of data sample times to produce a sequence of data samples;
(c) sampling the received signal at a time offset from each of the data sample times to produce a nulling sample corresponding to each of the data samples, thereby producing a sequence of nulling samples corresponding to the time offset;
(d) separately combining each of the data samples with a corresponding nulling sample from the sequence of nulling samples to produce a sequence of adjusted samples corresponding to the time offset;
(e) determining a first quality metric associated with the sequence of adjusted samples;
(f) determining a second quality metric associated with the sequence of data samples; and
(g) selecting a preferred sequence of samples based on the first and second quality metrics. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of reducing potential interference in an impulse radio receiver, comprising the steps of:
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(a) receiving a signal including an impulse signal, the impulse signal including a sequence of impulses;
(b) sampling the sequence of impulses at a sequence of data sample times to produce a sequence of data samples;
(c) sampling the received signal at a plurality of time offsets from each of the data sample times to produce a plurality of nulling samples corresponding to each of the data samples, thereby producing a separate sequence of nulling samples for each of the time offsets;
(d) separately combining each of the data samples with a corresponding nulling sample from each of the separate sequences of nulling samples to produce a separate sequence of adjusted samples corresponding to each of the time offsets;
(e) determining a separate quality metric for each of the separate sequences of adjusted samples;
(f) determining a quality metric for the sequence of data samples; and
(g) selecting a preferred sequence of samples based on the quality metrics determined at steps (e) and (f). - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of processing a received signal including an impulse signal and potential interference in an impulse radio receiver, including the steps of:
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(a) receiving a signal including an impulse signal, the impulse signal including a sequence of impulses;
(b) sampling the sequence of impulses at a sequence of data sample times to produce a sequence of data samples;
(c) sampling the received signal at a plurality of time offsets from each of the data sample times to produce a plurality of nulling samples corresponding to each of the data samples, thereby producing a separate sequence of nulling samples for each of the time offsets;
(d) separately combining each of the data samples with a corresponding nulling sample from each of the separate sequences of nulling samples to produce a separate sequence of adjusted samples corresponding to each of the time offsets;
(e) determining a separate quality metric for each of the separate sequences of adjusted samples; and
(f) selecting a preferred sequence of samples based on the quality metrics determined at step (e). - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A method of reducing potential interference in an impulse radio receiver, comprising the steps of:
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(a) receiving a signal including an impulse signal, the impulse signal including a sequence of impulses spaced in time from one another;
(b) sampling the sequence of impulses at a sequence of data sample times to produce a sequence of data samples;
(c) sampling the received signal at a time offset from each of the data sample times to produce a nulling sample corresponding to each of the data samples, thereby producing a sequence of nulling samples corresponding to the time offset;
(d) separately combining each of the data samples with a corresponding nulling sample from the sequence of nulling samples to produce a sequence of adjusted samples corresponding to the time offset; and
(e) further signal processing the sequence of adjusted samples.
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32. A method of reducing potential interference in an impulse radio receiver, comprising the steps of:
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(a) receiving a signal including an impulse signal, the impulse signal including a sequence of impulses spaced in time from one another;
(b) sampling the sequence of impulses at a sequence of data sample times to produce a sequence of data samples;
(c) accumulating N data samples of the plurality of data samples to produce an accumulated data sample, wherein N is an integer greater than one;
(d) sampling the received signal at a time offset from each of the data sample times to produce a nulling sample corresponding to each of the data samples, thereby producing a sequence of nulling samples corresponding to the time offset;
(e) accumulating N nulling samples of the sequence of nulling samples to produce an accumulated nulling sample;
(f) combining the accumulated data sample with the accumulated nulling sample to produce an adjusted accumulated sample;
(g) repeating steps (c) through (f) a plurality of times to produce a plurality of accumulated data samples and a plurality of adjusted accumulated samples;
(h) determining a first quality metric associated with the plurality of adjusted accumulated samples;
(i) determining a second quality metric associated with the plurality of accumulated data samples; and
(j) selecting for further signal processing, based on the first and second quality metrics, either the plurality of adjusted accumulated samples or the plurality of accumulated data samples.
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33. In an impulse radio receiver adapted to cancel potential interference from data samples by combining nulling samples with the data samples, wherein a time offset exists between each data sample and a corresponding nulling sample, a method for improving an impulse signal-to-interference ratio, comprising the steps of
(a) receiving a signal including an impulse signal, the impulse signal including a sequence of impulses; -
(b) searching for a preferred time offset at which to produce nulling samples; and
(c) reducing interference by combining data samples with nulling samples produced using the preferred time offset. - View Dependent Claims (34, 35, 36, 37, 39, 40, 41, 42)
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38. In an impulse radio receiver adapted to cancel potential interference from data samples by combining nulling samples with the data samples, wherein a time offset exists between each data sample and a corresponding nulling sample, a method for improving an impulse signal-to-interference ratio, comprising the steps of:
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(a) receiving a signal;
(b) searching for a preferred time offset at which to produce nulling samples; and
(c) reducing interference by combining data samples with nulling samples produced using the preferred time offset, wherein steps (a) and (b) are performed prior to receiving a further signal that includes an impulse signal.
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43. In an impulse radio receiver adapted to cancel potential interference from data samples by combining nulling samples with the data samples, a method for determining a preferred time offset between each data sample and a corresponding nulling sample, comprising the steps of:
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(a) receiving a signal including an impulse signal, the impulse signal including a sequence of impulses;
(b) sampling the sequence of impulses at a sequence of data sample times to produce a sequence of data samples;
(c) sampling the received signal at a plurality of time offsets from each of the data sample times to produce a plurality of nulling samples corresponding to each of the data samples, thereby producing a separate sequence of nulling samples for each of the time offsets;
(d) separately combining each of the data samples with a corresponding nulling sample from each of the separate sequences of nulling samples to produce a separate sequence of adjusted samples corresponding to each of the time offsets;
(e) determining a separate quality metric for each of the separate sequences of adjusted samples; and
(f) selecting one of the plurality of time offsets as the preferred time offset based on the quality metrics determined at step (e).
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44. In an impulse radio receiver adapted to cancel potential interference from data samples by combining nulling samples with the data samples, a method for determining a preferred time offset between each data sample and a corresponding nulling sample, comprising the steps of:
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(a) receiving a further signal including an impulse signal, the impulse signal including a train of impulses;
(b) sampling the train of impulses at a sequence of data sample times to produce a sequence of data samples;
(c) sampling the received signal at a time offset from each of the data sample times to produce a nulling sample corresponding to each of the data samples, thereby producing a sequence of nulling samples associated with the time offset;
(d) separately combining each of the data samples with the corresponding nulling sample to produce a sequence of adjusted samples corresponding to the time offset;
(e) determining a quality metric for the sequence of adjusted samples, the quality metric associated with the time offset;
(f) repeating steps (b) through (e) over time for a plurality of different time offsets, thereby determining a quality metric associated with each of the plurality of different time offsets; and
(g) selecting one of the plurality of different time offsets as the preferred time offset based on the quality metrics determined at step (e). - View Dependent Claims (46, 48, 49, 50)
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45. In an impulse radio receiver adapted to cancel potential interference from data samples by combining nulling samples with the data samples, a method for determining a preferred time offset between each data sample and a corresponding nulling sample, comprising the steps of:
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(a) receiving a signal;
(b) sampling the signal at a sequence of sample times to produce a sequence of samples;
(c) sampling the received signal at a plurality of time offsets from each of the sample times to produce a plurality of nulling samples corresponding to each of the samples, thereby producing a separate sequence of nulling samples for each of the time offsets;
(d) separately combining each of the samples with a corresponding nulling sample from each of the separate sequences of nulling samples to produce a separate sequence of adjusted samples corresponding to each of the time offsets;
(e) determining a separate quality metric for each of the separate sequences of adjusted samples; and
(f) selecting one of the plurality of time offsets as the preferred time offset based on the quality metrics determined at step (e), wherein steps (a) through (f) are performed prior to receiving a signal that includes an impulse signal.
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47. In an impulse radio receiver adapted to cancel potential interference from data samples by combining nulling samples with the data samples, a method for determining a preferred time offset between each data sample and a corresponding nulling sample, comprising the steps of:
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(a) receiving a signal;
(b) sampling the signal at a sequence of sample times to produce a sequence of samples;
(c) sampling the received signal at a time offset from each of the sample times to produce a nulling sample corresponding to each of the samples, thereby producing a sequence of nulling sample associated with the time offset;
(d) separately combining each of the samples with a corresponding nulling sample to produce a sequence of adjusted samples corresponding to the time offset;
(e) determining a quality metric for the sequences of adjusted samples, the quality metric associated with the time offset;
(f) repeating steps (b) through (e) over time for a plurality of different time offsets, thereby determining a quality metric associated with each of the plurality of different time offsets; and
(g) selecting one of the plurality of different time offsets as the preferred time offset based on the quality metrics determined at step (e), wherein steps (a) through (g) are performed prior to receiving a signal that includes an impulse signal.
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51. An impulse radio receiver subsystem for reducing potential interference, comprising:
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a data sampler adapted to sample a received signal at data sampling times to produce a sequence of data samples;
a nulling sampler adapted to sample the received signal at a time offset from each of the data sample times to produce a sequence of nulling samples;
a combiner adapted to separately combine each of the data samples with a corresponding nulling sample from the sequence of nulling samples to produce a sequence of adjusted samples;
a first quality metric generator adapted to determine a first quality metric associated with the sequence of data samples;
a second quality metric generator adapted to determine a second quality metric associated with the sequence of adjusted data samples; and
a selector adapted to select either the sequence of data samples or the sequence of adjusted samples, based on the first and second quality metrics. - View Dependent Claims (52, 53, 54, 55, 56, 57, 58, 59, 60)
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61. An impulse radio receiver subsystem for reducing potential interference, comprising:
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a data sampler adapted to sample a received signal at a sequence of data sample times to produce a sequence of data samples;
a plurality of nulling samplers, wherein each nulling sampler is adapted to sample the received signal at a separate time offset from each of the data sample times to produce a separate sequence of nulling samples for each of the time offsets;
a plurality of combiners, wherein each combiner is adapted to separately combine each of the data samples with a corresponding nulling sample from each of the separate sequences of nulling samples to produce a separate sequence of adjusted samples corresponding to each of the time offsets;
a plurality of quality metric generators, wherein each quality metric generator is adapted to determine separate quality metric associated with one of the separate sequences of adjusted samples; and
a selector adapted to select a preferred sequence of samples, based on the determined quality metrics. - View Dependent Claims (62, 63, 64, 65, 66, 67, 68, 69, 70)
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71. An impulse radio receiver subsystem for reducing potential interference, comprising:
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a data sampler adapted to sample a received signal at a sequence of data sample times to produce a sequence of data samples;
a first accumulator adapted to repeatedly accumulate N data samples of the plurality of data samples to produce a group of accumulated data sample, wherein N is an integer greater than one;
a nulling sampler adapted to sample the received signal at a time offset from each of the data sample times to produce a nulling sample corresponding to each of the data samples, thereby producing a sequence of nulling samples corresponding to the time offset;
a second accumulator adapted to repeatedly accumulate N nulling samples of the sequence of nulling samples to produce a group of accumulated nulling samples;
a combiner adapted to combine accumulated data samples in the group of accumulated data samples with corresponding accumulated nulling samples in the group of accumulated nulling samples to produce a group of adjusted accumulated samples;
a first quality metric generator adapted to determine a first quality metric associated with the group of adjusted accumulated samples;
a second quality metric generator adapted to determine a second quality metric associated with the group of accumulated data samples; and
a selector adapted to select either the group of adjusted accumulated samples or the group of accumulated data samples, based on the first and second quality metrics.
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72. An impulse radio receiver subsystem for reducing potential interference, comprising:
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a data sampler adapted to sample a received signal at data sampling times to produce a sequence of data samples;
a nulling sampler adapted to sample the received signal at a time offset from each of the data sample times to produce a sequence of nulling samples; and
a combiner adapted to separately combine each of the data samples with a corresponding nulling sample from the sequence of nulling samples to produce a sequence of adjusted samples. - View Dependent Claims (73, 74)
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75. An impulse radio receiver subsystem adapted to improve an impulse signal-to-interference ratio of received signals, comprising:
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an interference analyzer to search for and select a preferred time offset;
a data sampler adapted to sample a sequence of impulses of a received signal at data sampling times to produce a sequence of data samples;
a nulling sampler adapted to sample the received signal at the preferred time offset from each of the data sample times to produce a sequence of nulling samples; and
a combiner adapted to separately combine each of the data samples with a corresponding nulling sample from the sequence of nulling samples to produce a sequence of adjusted samples, wherein the sequence of adjusted samples are used for further signal processing. - View Dependent Claims (76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87)
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Specification