MIMO OFDM timing synchronization device

A timing synchronization and frame synchronization technology, applied in digital transmission systems, electrical components, modulated carrier systems, etc., can solve problems such as positioning deviation, and achieve the effect of improving accuracy, improving receiving accuracy, and simplifying operations

Inactive Publication Date: 2015-07-08
INST OF DONGGUAN SUN YAT SEN UNIV +1
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Problems solved by technology

[0006] In the IEEE 802.11n protocol, the highest bandwidth is 40M, which requires that the operating frequency of the synchronization algorithm hardware module must be higher than 40M, and due to the existence of cyclic shift, when the traditional synchronization algorithm hardware system performs symbol synchronization, there will be positioning deviation

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  • MIMO OFDM timing synchronization device
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  • MIMO OFDM timing synchronization device

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[0027] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0028] The overall block diagram of the hardware is as figure 1 As shown, it includes a frame synchronization detection unit, a coarse frequency offset estimation unit, a symbol synchronization detection unit, and a fine frequency offset estimation unit. Among them, the principle of the frame synchronization algorithm adopts the delayed autocorrelation algorithm. There is a preamble sequence in the IEEE802.11 series of protocols. The autocorrelation algorithm can be used to detect the frame signal when the preamble sequence arrives; the symbol synchronization adopts the cross-correlation algorithm, using The long training sequence in the preamble is used for fine symbol synchronization; the frequency offset estimation uses the CORDIC algorithm. The main modules us...

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Abstract

The invention discloses a timing synchronization hardware implementation method applicable to an OFDM system. An IEEE 802.11a / g / n protocol is compatible, cyclic shift of the IEEE 802.11n protocol is correspondingly processed, and synchronous data are more accurate. A robust frame detecting algorithm is designed, whether data come truly is judged by means of cluster peak detection and instantaneous peak detection, judgment accuracy is improved, two self-correlation modules and a moving average module are used for coarse frequency offset estimation and fine frequency offset estimation respectively, final frequency offset is obtained comprehensively according to the relation between coarse frequency offset estimation and fine frequency offset estimation, frequency offset estimation accuracy is improved, an improved CORDIC algorithm is adopted for frequency offset correction, and operating efficiency is improved.

Description

Technical field [0001] The present invention belongs to the field of wireless communication technology, and relates to a hardware implementation of an OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) receiving synchronization algorithm. The present invention improves upon the IEEE 802.11n protocol so that the present invention is compatible IEEE 802.11a / g / n. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier modulation technology. Because it performs serial / parallel conversion of high-rate data streams, the continuous length of data symbols on each sub-carrier increases, effectively combating ISI, and it allows sub-carriers The channel spectrum overlaps each other, which maximizes the use of spectrum resources and improves transmission efficiency. Therefore, this technology is widely used in high-speed wireless local area network transmission, such as IEEE 802.11a / g / n protocol. However,...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/02
CPCH04L27/2671
Inventor 谭洪舟陆许明徐永键张毅光
Owner INST OF DONGGUAN SUN YAT SEN UNIV
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