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학술대회 Doppler Frequency Offset Estimation in OFDM Systems
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황현구, 박형준
International Symposium on Wireless Pervasive Computing (ISWPC) 2009, pp.1-4
09MR1700, 4세대 이동통신을 위한 적응 무선접속 및 전송 기술개발, 김영진
This paper presents frequency offset estimation algorithm in wireless OFDM cellular system such as 3G-LTE [1]. We first analyze the method of frequency offset estimation in general OFDM system. The analysis will show that the value of frequency offset estimation in cell boundary is inaccurate. Because doppler frequencies of signals transmitted from different base stations are different, the error of frequency offset estimation value is generated. We show how proposed algorithm can reduce the error of frequency offset estimation. Results of simulation show that the utilization of proposed algorithm can reduce the error of frequency offset estimation considerably. Proposed frequency offset estimation algorithm can increase overall system capacity because of performance improvement in cell boundary. Especially, 16-QAM or 64-QAM modulations for high data rate transmission is extremely sensitive to frequency offset, therefore proposed algorithm increases channel capacity for user in cell boundary. © 2009 IEEE.
KSP 제안 키워드
16 quadrature amplitude modulation(16QAM), 3G LTE, 64-QAM, Cell boundary, Cellular system, Channel capacity, Doppler frequency offset estimation, OFDM systems, Overall system, base station(BS), estimation algorithm