Transmission timing control device, digital roll-off filter,...

Details Transmission timing control device, digital roll-off filter,... Transmission timing control device, digital roll-off filter,...

2007-01-30

2007-01-30

Fan, Chieh M. (Department: 2611)

Pulse or digital communications

Spread spectrum

C375S229000, C375S354000, C375S213000, C375S347000

Reexamination Certificate

active

10144855

ABSTRACT:
In a mobile radio terminal at transmission timing control device, transmit data spread-modulated is delayed by a timing control portion with a timing of reception as a reference by a predetermined period of time having based on a unit time corresponding to a chip clock and it is then provided to a filtering portion. The filtering portion limits the transmit data in band and a timing control portion times transmission with a slight adjustment with an oversampling clock, a quadruple in frequency of the chip clock, serving as a unit time. In a mobile radio terminal at a digital roll-off filter, input digital data is held in accordance with a data period by a shift register successively. A counter counts in accordance with an oversampling period of 1/m and it is reset in accordance with a data period. A coefficient select circuit is driven by the counter's output to select and output repetitively, sequentially tap coefficients corresponding to m sampling points included in the data period for each tap output of the shift register. A multiplication circuit multiplies tap outputs by corresponding output tap coefficients and an addition circuit sums up such multiplications and provides the sum as a filter output.

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3GPP TS 25.211 V3.5.0(Dec. 2000), pp. 42.
Notice of Ground of Rejection from the Japanese Patent Office in Patent Application No. 2001-148627 mailed May 18, 2004 and translation.

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