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Strategic Study of CAE >> 2007, Volume 9, Issue 6

Adaptive Optimization of Correlation-Interval for DopplerSpread Estimation and Its Iterative Implement

1. National Mobile Communication Research Laboratory, Southeast University, Nanjing   210096, China ;

2. Department of Automation & Control, Southeast University, Nanjing   210096, China

Funding project:国家自然科学基金资助项目(60496311) Received: 2005-12-19 Revised: 2006-05-09

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Abstract

In this paper,  at first research of relation between correlation-interval and estimation accuracy is carried out,  and the optimal correlation-interval is proved to be existent that is adaptive to signal-to-noise ratio and velocity varieties. Then some special characteristics of the optimal correlation-interval are explored. Based on them an iterative correlation-interval optimized (CIO) algorithm is proposed.  It optimizes the correlation- interval and calculates the Doppler spread by increasing the resolution on time-domain iteratively.  Simulation results show that contrasted to conventional schemes the proposed approach is less sensitive to signal-to-noise ratio and velocity varieties,  and can improves the performance dramatically in low signal-to-noise ratio environment in which the conventional schemes has a poor performance. It achieves the high accurate estimation of Doppler spread directly.

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