Method and apparatus of timing synchronization, leading symbol as well as method and apparatus for generating the same

Abstract

The invention discloses a timing synchronization method and a device based on a preamble signal with the central symmetry correlated characteristic and delay correlated characteristic. The method comprises the following steps: determining the timing measurement function of the received preamble signal according to the central symmetry correlated function and delay correlated function of the received preamble signal; and determining the position of a first path signal according to the timing measurement function, and adopting the position as a timing synchronization position. The scheme simultaneously utilizes the central symmetry correlated characteristic and delay correlated characteristic of the preamble signal, therefore, the influence of the side lobe can be well inhibited, and the position of the first path signal can be accurately searched out. In addition, the invention also discloses a method and a device for generating the preamble signal with the central symmetry correlated characteristic and delay correlated characteristic, and the generated preamble signal can simultaneously support the precise timing synchronization and the frequency offset estimation and also well support the channel estimation and the signal-to-noise ratio estimation; therefore, the utilization ratio of the preamble signal can be greatly improved.

Description

technical field [0001] The present invention relates to mobile communication technology, in particular to a timing synchronization method and device based on a preamble symbol with central symmetric correlation characteristics and delay correlation characteristics in an Orthogonal Frequency Division Multiplexing (OFDM) system, and a method for generating a preamble symbol and device. Background technique [0002] Generally, in order for the receiving end of the OFDM system to correctly demodulate the data sent by the sending end, the OFDM system must realize accurate and reliable time synchronization between the sending end and the receiving end. At the same time, since the OFDM system is very sensitive to the frequency offset of the carrier, the receiving end of the OFDM system also needs to provide an accurate and efficient carrier spectrum estimation method to accurately estimate and correct the carrier frequency offset. [0003] At present, the timing synchronization m...

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Problems solved by technology

[0004]The existing timing synchronization methods based on preamble symbols can be roughly divided into two categories: one is the timing synchronization algorithm based on the delay correlation characteristics of preamble symbols, this type of synchronization The algorithm has low computational complexity and can obtain more accurate carrier frequency offset estimation performance, but it is difficult to obtain accurate synchronization timing performance; the other type is a timing synchronization algorithm based on the central symmetric correlation characteristic of the preamble symbol, which has relatively high computational complexity. High, more accurate synchronization timing performance can be obtained, but it is difficult to obtain accurate carrier frequency offset estimation performance

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