[특허]Automatic frequency control method and apparatus therefor

Automatic frequency control method and apparatus therefor 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04L-027/22
출원번호	US-0411211 (1995-03-27)
우선권정보	KR-0006089 (1994-03-25); KR-0006090 (1994-03-25)
발명자 / 주소	Choi Yang-seok (Seoul KRX)
출원인 / 주소	Samsung Electronics Co., Ltd. (Kyungki-do KRX 03)
인용정보	피인용 횟수 : 23 인용 특허 : 0

초록 ▼

An automatic frequency control apparatus used in an MPSK communication system detects a frequency offset between a carrier and a local oscillation signal for adjustment of a local oscillation frequency. A phase difference detector generates a first phase difference detection signal having, as a phase value, a difference between the phases of various samples of the sampled signal. A phase altering unit generates a second phase difference detection signal having a phase value different from that of the first phase difference detection signal. A frequency offset signal generator estimates transmission phase information by using the phase value of the second phase difference detection signal and reference phase signals used for MPSK modulation, thereby generating a frequency offset signal which is determined by the transmission phase signal and the second phase difference detection signal. The result is that the number of the reference phases which are used for determination of the transmission phase information by altering the phase of the phase difference signal, is reduced. Accordingly, the hardware cost for implementing the apparatus can be lowered. The invention can be used for automatic frequency control in a modem which is used for all the types of MPSK modulation.

대표청구항 ▼

An automatic frequency control method for receiving an M-ary phase-shift-keying modulated signal, detecting a frequency offset signal and controlling a frequency oscillator based on the detected frequency offset signal, said automatic frequency control method comprising the steps of: sampling the received signal with a predetermined sampling frequency and generating a sampled complex signal, detecting a phase difference value between the sampled complex signal and a previously received sampled complex signal, to generate a first phase difference detection signal having a phase value corresponding to the detected phase difference value; altering the detected phase difference value of the first phase difference detection signal by a predetermined phase altering factor, to generate a second phase difference detection signal having a phase value corresponding to the altered phase difference value; determining transmission phase information of the received signal by using the altered phase difference value of the second phase difference detection signal and reference phase values used for information transmission of the M-ary phase-shift-keying modulation signal; and generating the frequency offset signal by using the determined transmission phase information and the altered phase difference value.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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Automatic frequency control method and apparatus therefor 원문보기

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Automatic frequency control method and apparatus therefor 원문보기

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