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Performance Analysis of Clock Recovery for OFDM/QPSK-DMR System Using Band Limited-Pulse Shaping Filter  

안준배 ((주)쏠리테크)
양희진 ((주)쏠리테)
강희곡 ((주)휴메이)
오창헌 (한국기술교육대학교 정보기술공학)
조성준 (한국항공대학교 전자ㆍ정보ㆍ통신컴퓨터공학부)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.8, no.2, 2004 , pp. 245-249 More about this Journal
Abstract
In this paper, we have proposed a clock recovery algorithm of Orthogonal Frequency Division Multiplexing/Quadrature Phase Shift Keying Modulation-Digital Microwave Radio(OFDM/QPSK-DMR) system using Band Limited-Pulse Shaping Filter(BL-PSF) and compared the clock phase error variance of OFDM/QPSK-DMR system with that of single carrier DMR system. The OFDM/QPSK-DMR system using windowing method requires training sequence or Cyclic Prefix (CP) to synchronize the clock phase of received signal. But transmit efficient is increased in our proposed DMR system because of no using redundant data such as training sequence or CP. The proposed clock recovery algorithm is simply realized in the OFDM/QPSK-DMR system using BL-PSF. The simulation results confirm that the proposed clock recovery algorithm has the same clock phase error variance performance in a single carrier DR system under Additive White Gaussian Noise(AWGN) environment.
Keywords
Clock Recovery; DMR System; OFDM System; Band-limited Pulse Shaping Filter;
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  • Reference
1 L. M. Correia, and R. Prasad, 'An overview of wireless broadband Communications', IEEE Comm. Mag., vol. 35, no. 1, pp. 56-61, Jan. 1997
2 H. Minn, M. Zeng, and V. K. Bhargava, 'On timing offset estimation for OFDM systems', IEEE Comm. letters, vol. 4, no. 7, July 2000
3 R. Li, and G. Stette, 'Waveform shaped MCM for digital microwave radio', IEEE Conf., vol. 3, pp. 1695-1699, Jun. 1995
4 T. M. Schmidl and D. C. Cox, 'Robust frequency and timing synchronization for OFDM', IEEE Trans. Comm., vol. 45, pp. 1613-1621, Dec. 1997   DOI   ScienceOn
5 D. Landstrom, S. K. Wilson, J. J. van de Beek, P. Odling, and P. O. Borjesson, 'Symbol time offset estimation in coherent OFDM systems', in Proc. Int. Conf. on Communications, Vancouver BC, Canada, pp. 500-505, June 1999
6 D. Matic, T. A. J. R. M. Coenen, F. C. Schoute, and R. Prasad, 'OFDM timing synchronization : possibilities and limits to the usage of the cyclic prefix for maximum likelihood estimation', VTC'99, pp. 668-672, 1999
7 Proakis, Digital Communications. McGraw Hill, pp. 347-352, 2001