Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2005-04-05
2005-04-05
Liu, Shuwang (Department: 2634)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S144000, C375S346000
Reexamination Certificate
active
06876694
ABSTRACT:
An object of the present invention is to estimate and compensate more accurately transmission channels in CDMA signal decoding. Memory means stores received despread data. Slot position detection means detects positions of pilot symbols. Pilot symbol averaging means obtains transmission channel estimation value per pilot block, by averaging a plurality of reception channels in each pilot block. The transmission channel estimation values are delayed by delay means, multiplied by their weight and added by multi-pilot block transmission channel estimation means. Here, the weighs are controlled adaptively by weight determination means in accordance with the state of the channel. Channel compensation means compensate m-th information symbol in the n-th slot including the pilot block on the basis of the estimation values obtained by the multi-pilot block transmission channel estimation means.
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Liu Shuwang
Nec Corporation
Scully Scott Murphy & Presser
Wang Ted M
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