A Frequency Offset Estimation Project For TD-SCDMA System

• 1、Department of Information Engineering, Beijing University of Posts and Telecommunication

Abstract：TD-SCMA is telecommunication system bring forward by china firstly , and as one of 3G standard accepted by ITU and 3GPP. Frequency offset degrades the performance of joint detection in the downlink of TD-SCDMA system, Therefore some measures should be taken to correct it. This paper provides a new time diversity frequency offset estimation technique with MIDAMBLE code and SYNC-DL code, from the study of TD-SCDMA frame structure, initial cell search procedure and frequency offset estimation algorithm. The technique overcomes the weakness in frequency offset estimation of TD-SCDMA system, relative to the other 3G technology, works more effectively. The frequency offset estimation technique works by using the differential correlation method and the multi frames time diversity. The estimation accuracy and calculation complexity of the technique is analyzed. It is found from simulation that frequency offset can be controlled within ±0.1ppm by using this algorithm and accurate estimation in the TD-SCDMA signal acquisition system is well achieved.

Keywords： Frequency Offset Estimation TD-SCDMA Time Diversity