Frequency synchronization for TD-LTE-A downlink receiver

doi:10.1016/S1005-8885(11)60224-0

Acta Metallurgica Sinica(English letters) ›› 2012, Vol. 19 ›› Issue (1): 31-37.doi: 10.1016/S1005-8885(11)60224-0

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Frequency synchronization for TD-LTE-A downlink receiver

1. Shanghai Research Center for Wireless Communications, Shanghai 200335, China 2. Shanghai Institute of Micro-System and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China 3. Key Laboratory of Wireless Sensor Network & Communication, Shanghai Institute of Micro-System and Information Technology, Chinese Academy of Sciences, Shanghai 200335, China

Received:2011-04-25 Revised:2011-09-24 Online:2012-02-28 Published:2012-02-21
Contact: XIONG Yong E-mail:yong.xiong@shrcwc.org
Supported by:
This work was supported by the Natural Science Foundation of Shanghai (11ZR1435100), Chinese National Key Project (2009ZX03003002, 2011ZX0300100703, and 2012ZX03001008-004).

Abstract

Abstract:

A high accuracy frequency synchronization method is proposed for the 3rd generation partnership project (3GPP) long term evolution advanced (LTE-A) downlink receiver in time division duplexing (TDD) mode. In general, cyclic prefix (CP) correlation based fractional frequency offset (FFO) estimation method and primary synchronization signal (PSS) differential correlation based integer frequency offset (IFO) estimation method are applied for LTE-A frequency synchronization. However, the polarity of CP based FFO estimation result may get reversed when system FFO is closer to the edge of frequency estimation range on account of noise interference; PSS based IFO estimation has performance degradation in low signal noise ratio (SNR). We propose polarity detection aided CP based FFO estimation and frequency domain enhanced differential correlation based IFO estimation to obtain higher accuracy of frequency synchronization. Computer simulation shows that the proposed method greatly outperforms the conventional methods, especially in low SNR scenario.

Key words:

Time-division long term evolution advanced (TD-LTE-A), frequency synchronization, high accuracy, polarity reversion resistance

References

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