가변 대역 위상 동기 회로를 포함하는 위상 변조 장치 및 방법
- 8358178 (2013.01.22)
09MR3900, 이동통신 무선접속방식의 환경 적응형 자율제어 기술 연구,
- A phase modulation apparatus and method are provided. The phase modulation apparatus includes a storage to store phase modulation setting values corresponding to various communication modes; a phase modulation setting value selector to select, when a communication mode is changed, phase modulation setting values corresponding to the changed communication mode among the phase modulation setting values stored in the storage; and a phase modulator to modulate a phase of a transmission signal using the phase modulation setting values selected by the phase modulation setting value selector. According to the phase modulation apparatus, since a frequency characteristic of a loop filter in a PLL circuit is changed depending on a transmission mode of a communication apparatus and phase modulation is performed using appropriate bandwidths according to various transmission modes, it is possible to prevent noise characteristics from degrading when a PLL bandwidth changes.