Advances in Radio Science www.adv-radio-sci.net 1684-9965 1684-9973 6 Kleinheubacher Berichte 2007 2008 10.5194/ars-6-95-2008 http://www.adv-radio-sci.net/6/95/2008/ http://www.adv-radio-sci.net/6/95/2008/ars-6-95-2008.html http://www.adv-radio-sci.net/6/95/2008/ars-6-95-2008.pdf 95 100 2008-05-26 Analysis of communications and implementation performance of FFT based carrier synchronization of BPSK/QPSK bursts U. Wasenmüller wasenmueller@eit.uni-kl.de T. Brack N. Wehn Microelectronic System Design Research Group, University of Kaiserslautern, Erwin-Schrödinger-Straße, 67663 Kaiserslautern, Germany Carrier synchronization is a vital part of every inner receiver in wireless communications. Frequency offset and phase offset of the received burst must be estimated and the received samples must be corrected according to the estimation. An approximation of the maximum likelihood estimation of frequency offset is given by the Fast Fourier Transform (FFT). The accuracy of the estimation as well as the hardware complexity and throughput depend on the number of FFT points. We demonstrate three techniques to improve the accuracy of the FFT based frequency offset estimation respectively to reduce the number of needed FFT points. These three techniques as well as the reference algorithm without improvements combine phase offset estimation with frequency offset estimation. We present the communications and FPGA implementation performance of these techniques. Brack, T., Wasenmüller, U., Schmidt, D.,and Wehn, N.: Design Space Exploration for Frequency Synchronisation of BPSK/QPSK Bursts, Kleinheubacher Berichte, September 2004. Brack, T., Wasenmüller, U., and Wehn, N.: A configurable IP Core for Combined Blind Frequency and Phase Synchronization of MPSK Bursts, Proc. 2005 IST Mobile and Wireless Communication Summit, 2005. \bibitem [Mengali et al.(1997)]menand:97 Mengali, U. and D'Andrea, A.: Synchronization Techniques for Digital Receivers, Plenum Publishing Corporation, 1997, New York, ISBN 0-306-45725-3, 1997. \bibitem [H. Meyer et al. (1997)]meymoefec:97 Meyr, H., Moeneclaey, M., and Fechtel, S.: Digital Communication Receivers, John Wiley & Sons, Inc., New York, ISBN 0-471-50275-8, 1997. \bibitem [Volder, J.(1959)] vol:59 Volder, J.: The CORDIC Trigonometric Computing Technique, IRE Transactions on Electronic Computing, 1959, September, 8, 330–334, 1959. Wang, Y. and Serpedin, E., and Ciblat, P.: Optimal Blind Carrier Recovery for MPSK Burst Transmissions, IEEE Transactions on Communications, 51, 9, 1571–1581, 2003.