HPA 비선형 특성을 고려한 SSD(Simultaneous Single Band Duplex) 시스템의 설계와 성능 분석

Abstract

In this paper, we design a SSD(simultaneous single band duplex) system using RF cancellation and digital cancellation. And then, we analyze performance of the SSD system using pre-distorter with HPA non-linearity. Also, we analyze digital cancellation performance of the SSD system using pre-distorter with HPA non-linearity. Additionally, digital cancellation cancels residual self-interference. In linear conditions, digital cancellation can cancel self-interference of 40dB. Therefore, the SSD system has good BER performance because most of self-interference is canceled. But, in HPA non-linearity conditions, digital cancellation cancels residual self-interference of 25dB. In this conditions, self-interference is greater than desired signal. Therefore, bit informations of distant station can not be received. But, we confirm that if the proposed system uses pre-distorter then bit information of distant station can be received by HPA non-linearity compensation. Also, we confirm that 논문 15-40-01-04 The Journal of Korean Institute of Communications and Information Sciences '15-01 Vol.40 No.01 http://dx.doi.org/10.7840/kics.2015.40.1.23 23 ※ 이 논문은 미래창조과학부 및 정보통신기술진흥센터의 정보통신·방송 연구개발 사업의 일환으로 수행하였음.(14-000-04-001, 고집적 Compact MIMO 안테나 개발), 또한 2013년도 정부(교육과학기술부)의 재원으로 한국연구재단의 지원을 받아 수행된 기초연구사업임 (No.2013R1A2A2A01005849). First Author : ElectroMagnetic wave Technology Institute, RAPA, hskeum@rapa.or.kr, 정회원 ° Corresponding Author : Department of electronic engineering, Chungbuk National University, ecomm@cbu.ac.kr, 정회원 * Department of electronic engineering, Chungbuk National University, acy890217@naver.com, 학생회원 논문번호:KICS2014-09-355, Received September 18, 2014; Revised December 18, 2014; Accepted December 18, 2014 The Journal of Korean Institute of Communications and Information Sciences '15-01 Vol.40 No.01 24 even though the proposed system uses pre-distorter, if HPA non-linearity increases then digital cancellation performance is degraded by imperfect compensation of HPA non-linerity.