Chip blanking and processing in SCDMA to mitigate impulse and burst noise and/or distortion
First Claim
1. A method for mitigating impairment in a communication system, the method comprising:
- receiving a plurality of chips in a spreading interval;
for each chip of the spreading interval;
determining a signal level of the chip;
comparing the signal level of the chip to a first threshold to produce a first comparison result;
determining a composite signal level of a plurality of chips of a chip window of the spreading interval; and
comparing the composite signal level of the plurality of chips of the chip window to a second threshold to produce a second comparison result; and
keeping or erasing the chip based upon the first comparison result and the second comparison result.
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Accused Products
Abstract
A system for mitigating impairment in a communication system includes a delay block, a signal level block, a moving average window block, an impulse noise detection block, and a combiner. The delay block receives and delays each chip of a plurality of chips in a spreading interval. The signal level block determines a signal level of each chip of the plurality of chips in the spreading interval. The moving average window block determines a composite signal level for a chip window corresponding to the chip. The impulse noise detection block receives the signal level, receives the composite signal level, and produces an erasure indication for each chip of the plurality of chips of the corresponding chip window. The combiner erases chips of the plurality of chips of the spreading interval based upon the erasure indication.
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Citations
24 Claims
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1. A method for mitigating impairment in a communication system, the method comprising:
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receiving a plurality of chips in a spreading interval;
for each chip of the spreading interval;
determining a signal level of the chip;
comparing the signal level of the chip to a first threshold to produce a first comparison result;
determining a composite signal level of a plurality of chips of a chip window of the spreading interval; and
comparing the composite signal level of the plurality of chips of the chip window to a second threshold to produce a second comparison result; and
keeping or erasing the chip based upon the first comparison result and the second comparison result. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for mitigating impairment in a communication system comprising:
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a delay block operable to receive and delay each chip of a plurality of chips in a spreading interval;
a signal level block operable to determine a signal level of each chip of the plurality of chips in the spreading interval;
a moving average window block communicatively coupled to the signal level block and operable to determine a composite signal level for a chip window corresponding to the chip;
an impulse noise detection block communicatively coupled to the signal level block and to the moving average window block, operable to receive the signal level of each chip of the plurality of chips in the spreading interval, operable to receive the composite signal level corresponding to each chip of the plurality of chips, and operable to produce an erasure indication for each chip of the plurality of chips of the corresponding chip window; and
a combiner communicatively coupled to the delay block and to the impulse noise detection block and operable to keep or erase chips of the plurality of chips in the spreading interval based upon the erasure indication. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for mitigating impairment in a communication system, the method comprising:
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receiving a plurality of chips in a spreading interval;
for each chip of the spreading interval;
determining a signal level of the chip;
comparing the signal level of the chip to a first threshold to produce a first comparison result;
determining a composite signal level of a plurality of chips of a chip window of the spreading interval; and
comparing the composite signal level of the plurality of chips of the chip window to a second threshold to produce a second comparison result;
comparing the composite signal level of the plurality of chips of the corresponding chip window to a third threshold to produce a third comparison result; and
determining a fourth comparison result based upon third comparison results of adjacent chips; and
keeping or erasing the chip based upon the first comparison result, the second comparison result, and the fourth comparison result. - View Dependent Claims (23, 24)
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Specification