Rake receiver with individual finger compensator(s)

Details Rake receiver with individual finger compensator(s) Rake receiver with individual finger compensator(s)

2011-07-05

2011-07-05

Flores, Leon (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S136000, C375S141000, C375S142000, C375S144000, C375S150000, C375S316000, C375S340000, C375S343000, C375S346000, C375S347000, C375S349000, C375S350000, C455S063100, C455S114200, C455S296000, C455S501000, C370S334000, C370S335000, C370S342000

Reexamination Certificate

active

07974331

ABSTRACT:
Rake receivers in code division multiple access (CDMA) telecommunication comprise fingers (1,2,3) with each finger processing signal components for a particular transmission path to be able to better synchronize with a RF signal received via different paths, and a combiner (4) for combining the results originating from said fingers, and a compensator in the form of a controlled oscillator in a feedback loop. By locating a finger compensator (20-25) in a finger, said finger can handle complex situations, like Doppler shifts under high-speed conditions. Preferably, most or all fingers each comprise such a finger compensator, in which case said feedback loop can be avoided. Such a finger compensator can be hardware, software or a mixture of both when comprising a filter (21) plus an amplitude normalizer (22) between two arithmetical modules (20,25) for multiplying an input symbol signal with a conjugated previous input symbol signal and an output symbol signal with a previous output symbol signal.

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