Modulator

Details Modulator Modulator

2005-07-01

2010-06-22

Ghayour, Mohammad H (Department: 2611)

Pulse or digital communications

Spread spectrum

C375S131000, C375S146000, C375S295000, C375S296000, C370S203000

Reexamination Certificate

active

07742516

ABSTRACT:
A modulator, and more particularly an HPSK modulator, is disclosed that enables the circuit scale to be reduced and also enables power consumption to be reduced. An HPSK modulator209incorporated in a radio communication apparatus or the like is equipped with a spreading code multiplication section11, a complex arithmetic section101, a coefficient determination section51, and raised COS filters41and42. Spreading code multiplication section11multiplies transmit data DPDCH1by a spreading code Cd1. Complex arithmetic section101performs complex arithmetic on an output signal output from spreading code multiplication section11and a scrambling code Sn, and performs conversion to complex data. Coefficient determination section51determines a filter coefficient Ad1nbased on a gain factor βd1that determines transmission power. Raised COS filters41and42band-limit the complex data using the filter coefficient.

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