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A Difference Method of the Gravity Center with Double Pilots for the MC CDMA System

The Journal of China Universities of Posts and Telecommunications 2000年第4期7卷 62-67页

作者： LI Xiang ming, YUE Guang xin, YIN Chang chuan (School of Telecommunication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, P.R. China) School of Telecommunication Engineering Beijing University of Posts and Telecommunications Beijing 100876 P.R. China

A carrier recovery method of the power spectrum center difference adapting to the mobile channel of the MC CDMA system with serious Doppler shift using double pilots is presented. In the transmitter, two pilots of equal frequency distance to the carrier with one putting on the left position and the other on the right position of the carrier frequency are used. Even if a continuous sine wave is transmitted, the power spectrum is expanded to a Doppler band in the receiver owing to the multi path transmission and the Doppler shift. The pilot spectrum is made to pass through two narrow band filters which are transformed to the base band with local carrier wave in the receiver. The frequency difference between the local carrier and the transmitter carrier is obtained when the difference of the gravity centers of the two pilot spectra is computed.

关键词： orthogonal frequency division multiplexing MC CDMA carrier frequency synchronization timing synchronizati(

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Decision-Directed frequency Tracking Algorithm for OFDM System in Fast Fading Environments

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The Journal of China Universities of Posts and Telecommunications 2005年第2期12卷 46-49,63页

作者： HE Bo LI Jun LIN Jia-ru WU Wei-ling School of Information Science and Engineering Beijing University of Posts and Telecommunications Beijing 100876 P.R. China School of Information Science and Engineering Shandong University

This paper analyzed the structure of Orthogonal frequency Division Multiplex （OFDM） system and presented a new carrier frequency Offset （CFO） tracking algorithm, which depends on comparability between the decision data and the original data to correct carrier frequency offset. Therefore it is robust during the normal communization process since the Bit Error Rate （BER） of the decision data is low. We can utilize pilot data in time domain for channel estimation to track CFO without reducing system efficient and to enhance the tracking scope largely. Simulation results denote the presented algorithm can track the frequency offset and control it under ± 1% using only 1 frame if the original frequency offset is within ±8% .

关键词： OFDM multicarrier carrier frequency synchronization carrier frequency tracking

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