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http://dx.doi.org/10.13067/JKIECS.2012.7.1.135

Limit Analysis of the Distance between DU and RU in 4G FDD Mobile Communication Systems  

Kim, Sung-Man (경성대학교 전자공학과)
Publication Information
The Journal of the Korea institute of electronic communication sciences / v.7, no.1, 2012 , pp. 135-139 More about this Journal
Abstract
A majority of 4G Mobile communication manufacturers have launched separated-type base stations composed of DU (digital unit) and RU (ratio unit). DUs are usually installed in the central office, while RUs with antennas are installed on the top of building or pole. Therefore, the allowable distance between DU and RU is very important for cell planning. In this paper, we analyze the allowable distance between DU and RU induced by closed-loop MIMO (mulitple input multiple output) technology in 4G FDD (frequency division duplexing) mobile communication systems. In conclusion, the distance limit between DU and RU is dependent on the frequency of the wireless communication, and the allowable distance is about 11 km when assuming the operating frequency is 2 GHz.
Keywords
CPRI; FDD; Digital unit; Radio unit; Distance limit; Mobile communications;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
연도 인용수 순위
1 김성만, "중계기가 연결된 빔포밍 기지국을 위한 새로운 RF-패스 보정절차 방법", 한국전자통신학회논문지, 6권, 2호, pp. 274-279, 2011.
2 강명구, "W-CDMA 통신 시스템에서 새로운 롱 코드 MMSE 검파기 구성 및 성능 분석", 한국전자통신학회논문지, 6권, 2호, pp. 163-170, 2011.
3 김송민, 송진호, "초고속 무선통신에 적용 가능한 소형화된 UWB BPF 설계", 한국전자통신학회논문지, 5권, 6호, pp. 620-624, 2010.
4 고영조, 이경석, 서방원, 노태균, "LTE- Advanced 표준 기술 동향", 전자파기술, 21권, 2호, pp. 9-23, March 2010.
5 김성만, "DU-RU 형태의 Mobile WiMAX 기지 국에서 DU-RU 간 거리 및 Cell 반경의 한계에 관한 연구", 한국통신학회 2011년도 동계종합학술발표회, paper 6C-60, Feb. 2011.
6 Common Public Radio Interface (CPRI); Interface Specification, ver 4.2, 2010.
7 Sung-Man Kim, "Limits of digital unit-remote radio unit distance and cell coverage induced by time division duplex profile in mobile WiMAX systems", International Journal of Communication Systems, early view version, DOI: 10.1002/dac.1356, Oct. 2011.
8 김상근, 오이석, "실내 채널 환경에서 MIMO 시스템의 안테나 이격거리에 따른 채널 용량 분석 ", 한국전자파학회논문지, 17권, 11호, pp.1058-1064, 2006.
9 N. Ebrahimi-Tofighi, M. ArdebiliPour, and M. Shahabadi, "Receive and Transmit Array Antenna Spacing and Their Effect on the Performance of SIMO and MIMO Systems by using an RCS Channel Model", World Academy of Science, Engineering and Technology, Vol. 36, pp.1-5, 2007.