Synchronous estimation method and system for orthogonal frequency division multiplexing technique

Abstract

The invention provides an in-phase estimation method and a system of the orthogonal frequency division multiplexing (OFDM) technology, wherein the method includes: obtaining the sub-channels which satisfy the given transmission quality in the OFDM symbols; computing the phase offset between the data on the obtained sub-channels and the data on the sub-channels with the same position in the adjacent OFDM symbols; estimating the residual carrier frequency shift and the sampling clock shift of the current OFDM symbols. The method and the system estimates the residual carrier frequency shift and the sampling clock shift through the mutual correlation data on the sub-channels which satisfy the given transmission quality, overcomes the effect of the sub-channel with bad quality to generate the error code, advances the precision of the in-phase estimation to a great extent.

Description

technical field

[0001] The present invention relates to Orthogonal Frequency Division Multiplexing (OFDM) technology, in particular to a synchronization estimation method and system of OFDM technology. Background technique

[0002] OFDM is a frequency division multiplexing technology capable of transmitting high-speed data services. It has high frequency band utilization and strong anti-multipath interference ability. Therefore, OFDM has received more and more attention and attention, and is considered to be the future wireless It is one of the preferred technologies for multimedia mobile communication, and has been applied in the physical layer series standards of wireless local area network, European digital audio broadcasting standard (DAB) and digital time-frequency standard (DVB).

[0003] Although a number of technical standards have been formulated for the OFDM transmission technology at present, there are still many difficult problems in the OFDM technology. Synchro...

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