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Synchronous estimation method and system for orthogonal frequency division multiplexing technique

An orthogonal frequency division technology, applied in the field of synchronization estimation of OFDM technology, can solve the problems of interference, reduce the accuracy of synchronization estimation, affect the accuracy of synchronization estimation method, etc., and achieve the effect of improving the accuracy

Inactive Publication Date: 2008-11-05
HUAWEI TECH CO LTD +1
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Problems solved by technology

[0026] This method does not need to extract the pilot frequency, but the sub-channel with poor channel transmission quality will generate bit errors in the hard decision, and the generated bit errors will introduce interference in the synchronization estimation, affecting the accuracy of the synchronization estimation method
[0027] It can be seen from the above description that the synchronization estimation methods in the prior art will be affected by sub-channels with poor transmission quality, which will reduce the accuracy of synchronization estimation

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  • Synchronous estimation method and system for orthogonal frequency division multiplexing technique
  • Synchronous estimation method and system for orthogonal frequency division multiplexing technique
  • Synchronous estimation method and system for orthogonal frequency division multiplexing technique

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Embodiment Construction

[0049] In order to make the above technical solutions, objectives and advantages clearer, the present invention will be described in detail below in conjunction with specific embodiments.

[0050] The synchronization estimation method of the OFDM system provided by the embodiment of the present invention mainly includes: acquiring the subchannel meeting the set transmission quality requirements in the current OFDM symbol; The phase difference between the data on the sub-channel; using the calculated phase difference, estimate the remaining carrier frequency offset and sampling clock offset of the current OFDM symbol.

[0051] Here, the OFDM symbol used for channel estimation is taken as the current OFDM symbol.

[0052] Wherein, the subchannels meeting the set transmission quality requirements in the obtained OFDM symbols may all be signal subchannels meeting the set transmission quality requirements; may also include subchannels meeting the set transmission quality requiremen...

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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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B7/26
Inventor 任光亮行江涛曾雁星梁伟光
Owner HUAWEI TECH CO LTD
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