Frequency Synchronization Algorithm for Improving Performance of OFDMA System in 3GPP LTE Downlink 


Vol. 34,  No. 1, pp. 120-130, Jan.  2009


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  Abstract

In this paper, we propose a receiver structure for frequency synchronization in OFDMA (Orthogonal Frequency Division Multiple Access) system which is considered as 3GPP LTE(Long Term Evolution) downlink. In general, OFDMA frequency synchronization consists of two parts: coarse synchronization and fine synchronization. We consider P-SCH (Primary-Synchronization Channel) and CP (Cyclic Prefix) of OFDMA symbol for coarse synchronization and fine synchronization, respectively. The P-SCH signal has two remarkable disadvantages that it does not have sufficiently many sub-carriers and its differential correlation characteristic is not good due to ZC (Zadoff Chu) sequence-specific property. Hence, conventional frequency synchronization algorithms cannot obtain satisfactory performance gain. In this paper, we propose a modified differential correlation algorithm to improve performance of the coarse frequency synchronization. Also, we introduce an effective PLL (Phase Locked Loop) structure to guarantee stable performance of the fine frequency synchronization. Simulation results verify that the proposed algorithm has superior performance to the conventional algorithms and the 2nd-order PLL is effective to track the fine frequency offset even in high mobility.

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  Cite this article

[IEEE Style]

D. Lee, S. Im, H. Roh, H. Choi, "Frequency Synchronization Algorithm for Improving Performance of OFDMA System in 3GPP LTE Downlink," The Journal of Korean Institute of Communications and Information Sciences, vol. 34, no. 1, pp. 120-130, 2009. DOI: .

[ACM Style]

Dae-Hong Lee, Se-Bin Im, Hee-Jin Roh, and Hyung-Jin Choi. 2009. Frequency Synchronization Algorithm for Improving Performance of OFDMA System in 3GPP LTE Downlink. The Journal of Korean Institute of Communications and Information Sciences, 34, 1, (2009), 120-130. DOI: .

[KICS Style]

Dae-Hong Lee, Se-Bin Im, Hee-Jin Roh, Hyung-Jin Choi, "Frequency Synchronization Algorithm for Improving Performance of OFDMA System in 3GPP LTE Downlink," The Journal of Korean Institute of Communications and Information Sciences, vol. 34, no. 1, pp. 120-130, 1. 2009.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880