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US 5,687,198 AGranted
Channel estimation in a communication system
AssigneeMotorola, Inc.
InventorsThomas A. Sexton, Fuyun Ling
Life of this patent
Estimating the term…
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AssigneeMotorola, Inc.
InventorsThomas A. Sexton, Fuyun Ling
Estimating the term…
A receiver (200, 400) implements improved channel estimation. The receiver (200, 400) demodulates a transmitted signal, and makes an initial channel estimate (115). The receiver (200, 400) then makes a hard decision (301) as to whether the channel estimate was correct and groups samples representing the decision. A vector sum of the group of samples is computed (302), and each sample is compared to the vector sum (303). The sample having the largest projection on the vector sum is retained (304), and the other samples are considered noise, and are thus discarded (305). After obtaining a predetermined number of retained samples (306), the retained samples are used to generate an new channel estimate (226). Since the noisy estimates are discarded, the new channel estimate (226) contains fewer errors than the initial channel estimate (115). The new channel estimate (226) is used to generate decoded data (250).
A method of estimating a channel in a communication system, the communication system implementing signals including both a reference sequence and a data sequence, the data sequence having errors as a result of a transmission of the signal, the method comprising the steps of:
An apparatus for estimating a channel in a communication system, the communication system implementing signals including both a reference sequence and a data sequence, the data sequence having errors as a result of a transmission of the signal, the apparatus comprising:
An apparatus for estimating a channel in a communication system, the communication system implementing signals including a data sequence having errors as a result of a transmission of the signal, the apparatus making a channel estimate based on a plurality of estimated Walsh symbols, the apparatus comprising:
Dependencies are inferred from the claim text.