Journal of IKEEE (전기전자학회논문지)

Institute of Korean Electrical and Electronics Engineers (한국전기전자학회)
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DQPSK OFDM-Based HF-Band Communication System with Individual Subcarrier

차동 직교 위상 편이 변조 방식의 직교주파수 분할다중 기반 단파 대역 통신 시스템

  • Choi, Sung-Cheol (Special Department, SAMYUNG ENC Co., Ltd.) ;
  • Kim, Jeong-Nyun (Fishery Info-Communication System, National Federation of Fisheries Cooperatives) ;
  • Park, Hyung Chul (Dept. of Electronic and IT Media Eng., Seoul National University of Science and Technology)
  • Received : 2018.09.07
  • Accepted : 2018.09.19
  • Published : 2018.09.30
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Abstract

This paper presents a novel HF band differential quadrature phase-shift keying (DQPSK) orthogonal frequency-division multiplexing (OFDM) communication system. The system can deliver 3.6 kbps with a bandwidth of about 3 kHz. In a digital modem, OFDM with 32-point fast Fourier transform is used. In the system, each subcarrier uses DQPSK modulation. Hence, a demodulator does not require carrier phase recovery and symbol timing recovery. And, each subcarrier employs CRC error check code individually. By using CRC code for each subcarrier, bit error caused by multipath fading can be recovered simply.

본 논문에서는 차동 직교 위상 편이 변조 방식 (DQPSK)의 직교주파수 분할다중 (OFDM) 기반의 단파 (HF) 대역 통신시스템을 제안한다. 제안 시스템은 약 3 kHz의 대역폭에서 약 3.6 kbps의 전송속도를 지원한다. 디지털 변복조부는 32-point 고속 푸리에 변환 프로세스를 이용한다. 한편, 각각의 부반송파 데이터가 DQPSK 변조를 이용한다. 그래서, 복조기는 반송파 위상 복구 회로와 심볼 타이밍 복구 회로를 필요로 하지 않는 장점이 있다. 또한, 각 부반송파는 개별적으로 CRC 오류 검출 코드를 사용함으로서, 다중경로 페이딩에 의한 비트 오류를 간단히 해결할 수 있다.

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