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US 6,603,827 B2Granted
Method and apparatus for digital symbol detection using medium response estimates
AssigneeEricsson Inc.
InventorsGregory E. Bottomley, Karl Molnar, Rajaram Ramesh
Life of this patent
Estimating the term…
Abstract
According to the present invention, the effects of the transmission medium on transmitted information symbols are estimated separately from other effects, e.g., those associated with receive and transmit filters, using knowledge of the pulse shaping. The medium response estimate is then used to detect information symbols. Previously, receivers had used estimates of the composite channel to detect symbols. This, however, assumed uncorrelated noise, which is not always the case.
Claims11
A rake receiver comprising:
- a despreader operative to despread signal samples received over a transmission medium;
- a tapped delay line providing two or more delayed versions of said received despread samples;
- a medium response estimate generator providing at least one medium response estimate characterizing said transmission medium based on known pulse shaping information that repeats symbol to symbol;
- and
- a combiner for combining said delayed versions of said received despread samples based upon said medium response estimates to generate information symbol estimates.
2 more elements
A method for processing despread samples comprising:
- despreading signal samples received over a transmission medium;
- providing two or more delayed versions of said received despread samples;
- generating medium response estimates characterizing said transmission medium using known pulse shaping information that repeats symbol to symbol;
- and
- combining said delayed versions of said received despread samples based upon said medium estimates to generate information symbol estimates.
2 more elements
Dependencies are inferred from the claim text.