Symbol timing estimation in communication systems

Details Symbol timing estimation in communication systems Symbol timing estimation in communication systems

2005-11-17

2009-10-13

Fan, Chieh M (Department: 2611)

Pulse or digital communications

Synchronizers

Synchronizing the sampling time of digital data

C375S260000, C375S324000

Reexamination Certificate

active

07602870

ABSTRACT:
A symbol timing estimation method is provided for use in a communication system, for example an orthogonal frequency division multiplexing system having a cyclic prefix extension CPE. Each symbol in a transmitted signal comprises N symbol samples, and the CPE has L symbol samples. The method comprises receiving the signal and processing the symbol samples in the received signal using N and L to obtain a correlation function γ(d) for a first series of L samples and a second series of L samples following N samples after the first series. The obtained correlation function is normalized to produce a basic measure MCP(d) for symbol timing estimation. A second-derivative measure MCP—diff2(d) for symbol timing estimation is also produced based on a second derivative of the basic measure, and the symbol timing is estimated based on the basic and second-derivative measures.Such a symbol timing estimation method can work over a wide range of channel conditions and can detect the first significant path reliably in a multi-path environment, even if there are delayed paths of higher energy.

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