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This paper presents a complete synchronisation scheme of a baseband OFDM receiver for the currently designed 4G mobile communication system. Since the OFDM transmission is vulnerable to time and frequency offsets, accurate estimation of these parameters is one of the most important tasks of the OFDM receiver. In this paper, the design of a single OFDM synchronisation pilot symbol is introduced. The pilot is used for coarse timing offset and fractional frequency offset estimation. However, it can be applied for fine timing synchronisation and integer frequency offset estimation algorithms as well. A new timing metric that improves the performance of the coarse timing synchronisation is presented. Time domain synchronisation is completed after receiving this single OFDM pilot symbol. During the tracking phase, carrier frequency and sampling frequency offsets are tracked and corrected by means of the nondata-aided algorithm developed by the author. The proposed concept was tested by means of computer simulations, where the OFDM signal was transmitted over a multipath Rayleigh fading channel characterised by the WINNER channel models with Doppler shift and additive white Gaussian noise.
D2.10: Final report on identified RI key technologies, system concept, and their assessment Information Society Technologies, Yerevan, Armenia; December 2005.
Abaii M, Auer G, Cho Y, et al.: D6.13.7 Test Scenarios and Calibration Cases Issue 2. Information Society Technologies, Yerevan, Armenia; December 2006.
Schmidl TM, Cox DC: Robust frequency and timing synchronization for OFDM. IEEE Transactions on Communications 1997, 45(12):1613-1621. 10.1109/26.650240 CrossRef
Tufvesson F, Edfors O, Faulkner M: Time and frequency synchronization for OFDM using PN-sequence preambles. Proceedings of the 50th IEEE Vehicular Technology Conference (VTC '99), September 1999, Amsterdam, The Netherlands 4: 2203-2207.
Yan C, Fang J, Tang Y, Li S, Li Y: OFDM synchronization using PN sequence and performance. Proceedings of the 14th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC '03), September 2003, Beijing, China 1: 936-939.
Kim DK, Do SH, Cho HB, Chol HJ, Kim KB: A new joint algorithm of symbol timing recovery and sampling clock adjustment for OFDM systems. IEEE Transactions on Consumer Electronics 1998, 44(3):1142-1149. 10.1109/30.713247 CrossRef
Fechtel SA: OFDM carrier and sampling frequency synchronization and its performance on stationary and mobile channels. IEEE Transactions on Consumer Electronics 2000, 46(3):438-441. 10.1109/30.883390 CrossRef
Shi K, Serpedin E, Ciblat P: Decision-directed fine synchronization in OFDM systems. IEEE Transactions on Communications 2005, 53(3):408-412. 10.1109/TCOMM.2005.843463 CrossRef
Yang B, Letaief KB, Cheng RS, Cao Z: Timing recovery for OFDM transmission. IEEE Journal on Selected Areas in Communications 2000, 18(11):2278-2291. 10.1109/49.895033 CrossRef
Aronsson D, Auer G, Bittner S, et al.: Link level procedures for the WINNER System. Information Society Technologies, Yerevan, Armenia; November 2007.
Moose PH: Technique for orthogonal frequency division multiplexing frequency offset correction. IEEE Transactions on Communications 1994, 42(10):2908-2914. 10.1109/26.328961 CrossRef
Luise M, Reggiannini R: Carrier frequency acquisition and tracking for OFDM systems. IEEE Transactions on Communications 1996, 44(11):1590-1598. 10.1109/26.544476 CrossRef
Gardner FM: Phaselock Techniques. John Wiley & Sons, New York, NY, USA; 2005. CrossRef
Zheng Z-W, Yang Z-X, Pan C-Y, Zhu Y-S: Novel synchronization for TDS-OFDM-based digital television terrestrial broadcast systems. IEEE Transactions on Broadcasting 2004, 50(2):148-153. 10.1109/TBC.2004.828753 CrossRef
Proakis J: Digital Communications. 4th edition. McGraw-Hill, New York, NY, USA; 2001.
Langowski A, Piatyszek A, Długaszewski Z, Wesołowski K: VHDL realisation of the channel estimator and the equaliser in the OFDM receiver. Proceedings of the 10th National Symposium of Radio Science (URSI '02), March 2002, Poznan, Poland 129-134.
D5.4 Final Report on Link Level and System Level Channel Models Information Society Technologies, Yerevan, Armenia; September 2005.
Długaszewski Z, Wesołowski K: Simple coarse frequency offset estimation schemes for OFDM burst transmission. Proceedings of the 13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC '02), September 2002, Lisbon, Portugal 2: 567-571. CrossRef
- Time and Frequency Synchronisation in 4G OFDM Systems
- Springer International Publishing
EURASIP Journal on Wireless Communications and Networking
Elektronische ISSN: 1687-1499
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