CDMA demodulation circuit, CDMA mobile communication...

Details CDMA demodulation circuit, CDMA mobile communication... CDMA demodulation circuit, CDMA mobile communication...

2007-12-25

2007-12-25

Phu, Phuong (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S144000, C375S150000, C375S142000, C375S147000

Reexamination Certificate

active

10457380

ABSTRACT:
A CDMA demodulation circuit to be adapted to fluctuation of arrival path timing and to obtain good reception characteristics, can be provided. A despreading timing correction control portion controls number of despreading timing correction candidates depending upon result of comparison in a correction value difference calculating portion. An effective path timing judgment portion makes judgment of an effective path timing on the basis of correlation peak information detected by the correlation value difference calculating portion. Respective despreading portions perform despreading at a plurality of timings including a path timing set from the effective path timing judgment portion and despreading timing correction candidates of M points before and after the set path timing. The despreading timing correcting portion determines the dispreading timing correction value on the base of the results of respective dispreading despreaded by the dispreading portion, and feeds it back to the respective dispreading portion.

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