Apparatus and method for measuring propagation delay in an NB-TDD CDMA mobile communication system

摘要

A transmitter for data communication capable of reducing generation of spurious signals without an increase in a ROM size of a DDS (Direct Digital Synthesizer), which causes an increase in power consumption, and without restricting a transmission frequency. The transmitter comprises a first mixer for converting an output of a modulator to a first IF (Intermediate Frequency) signal using a first local signal generator; a digital filter for suppressing a predetermined out-band signal among the first IF signal; and a second mixer for D/A (Digital-to-Analog)-converting an output of the digital filter, and converting the D/A-converted signal to a second analog IF signal or RF (Radio Frequency) signal using a second local signal generator. A frequency step of the first local signal generator is less than a frequency step of the second local signal generator.