The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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A Synchronous Digital Duplexing Technique for Wireless Transmission in Indoor Environments

옥내 환경에서 무선 전송을 위한 동기식 디지털 이중화 방식

  • Park, Chang-Hwan (School of Electrical & Electronic Engineering, Chung-Ang University) ;
  • Ko, Yo-Han (School of Electrical & Electronic Engineering, Chung-Ang University) ;
  • Park, Kyung-Won (Advanced Mobile Technology Research Center, Korea Electronics Technology Institute) ;
  • Jeon, Won-Gi (Advanced Mobile Technology Research Center, Korea Electronics Technology Institute) ;
  • Paik, Jong-Ho (Advanced Mobile Technology Research Center, Korea Electronics Technology Institute) ;
  • Lee, Seok-Pil (Broadcasting.Communication Convergence Research Center, Korea Electronics Technology Institute) ;
  • Cho, Yong-Soo (School of Electrical & Electronic Engineering, Chung-Ang University)
  • Published : 2008.12.31
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Abstract

In this paper, we propose a new digital duplexing scheme, called SDD(Synchronous Digital Duplexing), which can increase data efficiency and flexibility of resource by transmitting uplink signal and downlink signal simultaneously. In order to transmit uplink data and downlink data simultaneously, the proposed SDD obtains mutual informations between AP(access point) and each SSs(subscriber station), SS and other SSs by mutual ranging procedure. These informations are used for selection of transmission time, decision of CS insertion, setting of CS length, and FFT duration resetting, etc. It is shown that the proposed SDD is appropriate for duplexing scheme in indoor environments over the conventional TDD(Time Division Duplexing) and FDD(Frequency Division Duplexing).

본 논문에서는 무선 전송 시스템에서 OFDMA(Orthogonal Frequency Division Multiple Access) 방식을 사용하여 상향링크 신호와 하향링크 신호를 동시에 전송하면서 자원의 효율을 높이고 자원 할당의 유연성을 향상시킬 수 있는 디지털 이중화 방식으로 SDD(Synchronous Digital Duplexing) 방식을 제안한다. SDD 방식은 상 하향링크 신호를 동시에 송 수신하기 위해 상호 레인징(mutual ranging) 과정을 통하여 AP(access point)와 각 SS(subscriber station), SS와 다른 SS 사이의 상호 시간 동기 정보와 상호 채널 정보를 획득한다. 획득한 정보는 전송시간 선택 및 CS 삽입 여부 판단, CS 길이 설정, FFT 구간 재설정 등에 이용된다. 제안된 SDD 방식이 무선채널에서 사용되는 기존의 이중화 방식인 TDD(Time Division Duplexing), FDD(Frequency Division Duplexing)와 비교하여 옥내 환경에서 적합한 이중화 방식임을 확인한다.

Keywords

References

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