Title :
A coarse time offset estimation in TD-SCDMA downlink with low SNRs
Author :
Deng, Zhangchao ; Hua, Jingyu ; Zhuang, Yanying ; Meng, Limin ; Meng, Yan
Author_Institution :
Zhejiang Provincial Key Lab. of Opt. Commun. Technol., Zhejiang Univ. of Technol., Hangzhou, China
Abstract :
The time offset estimation (TOE) is an important issue in TD-SCDMA downlink, which conventionally is realized together with downlink synchronization code acquisition, and therefore the correlation detection is prefered. However, the resulting complexity is very high due to the start search within a full frame. In order to tackle this problem, this paper presents a coarse TOE scheme independent of the synchronization code acquisition, where the intrinsic power transition property of the TD-SCDMA frame is exploited and a power ratio detection (PRD) method is proposed for coarse TOE, then, if a subsequent coherent detection is employed, its start search can be confined to a very small range. Monte Carlo simulations are exploited to test the proposed scheme and the result shows a good performance at low signal-to-noise ratios (SNR).
Keywords :
Monte Carlo methods; code division multiple access; correlation theory; estimation theory; Monte Carlo simulation; PRD method; TD-SCDMA downlink; coarse TOE scheme; coarse time offset estimation scheme; correlation detection; downlink synchronization code acquisition; intrinsic power transition property; low SNR; low signal-to-noise ratio; power ratio detection method; Complexity theory; Correlation; Downlink; Estimation; Signal to noise ratio; Synchronization; Time division synchronous code division multiple access; Power Ratio Detection; Signal-to-noise Ratio; TD-SCDMA; Time Offset Estimation;
Conference_Titel :
Electronics, Communications and Control (ICECC), 2011 International Conference on
Conference_Location :
Ningbo
Print_ISBN :
978-1-4577-0320-1
DOI :
10.1109/ICECC.2011.6067724
