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Synchronization method of orthogonal frequency division multiplexing-ultra wideband (OFDM-UWB) system based on peak detection

An OFDM-UWB and peak detection technology, applied in the field of short-distance wireless communication, can solve the problems of poor synchronization effect, inability to overcome multipath effects, and lack of universality, so as to facilitate frame capture and reduce implementation complexity , the effect of facilitating peak detection

Inactive Publication Date: 2011-01-19
SOUTHEAST UNIV +1
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Problems solved by technology

Among them, the delayed autocorrelation scheme, which has a greater performance improvement, has better robustness to low signal-to-noise ratios, but cannot overcome the multipath effect.
Multipath energy accumulation is performed after delayed autocorrelation. Although the implementation complexity has been improved to a certain extent, the synchronization performance has been greatly improved compared with before.
The existing energy accumulation scheme is to accumulate the delay autocorrelation results, which is not universal for the four different channel environments mentioned in the ECMA-368 standard, especially for the CM4 channel mode, the multipath energy Scattered, not very well synchronized

Method used

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  • Synchronization method of orthogonal frequency division multiplexing-ultra wideband (OFDM-UWB) system based on peak detection
  • Synchronization method of orthogonal frequency division multiplexing-ultra wideband (OFDM-UWB) system based on peak detection
  • Synchronization method of orthogonal frequency division multiplexing-ultra wideband (OFDM-UWB) system based on peak detection

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Embodiment Construction

[0040] The preferred embodiments will be described in detail below in conjunction with the drawings, but the scope of protection of the present invention is not limited to the embodiments.

[0041] In the ECMA-368 standard, the physical layer convergence protocol (Physical Layer Convergence Protocol, PLCP) sublayer data frame format is specified, such as figure 1 As shown, the PLCP preamble sequence is located at the front end of the data frame, consisting of a frame synchronization (PS) sequence and a channel estimation (CE) sequence, and has two modes: standard and burst. Among them, the PS sequence is composed of the basic PS sequence defined in the time domain with good autocorrelation performance, such as figure 2 As shown, it can be used to capture data frames, coarse timing synchronization, coarse carrier frequency offset estimation and so on.

[0042] For standard mode, combine image 3 Describe in detail the construction process of the PS sequence:

[0043] Accord...

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Abstract

The invention belongs to the technical field of wireless communication, in particular to a synchronous method of an orthogonal frequency division multiplexing-ultra wideband (OFDM-UWB) system based on peak detection. The method improves the existing method of cross correlation, delay autocorrelation and accumulation operation and uses standard matched filtering operation to replace the accumulation operation, which not only achieves accumulation of multi-path channel energy but also inhibits noise component during the process of collecting energy, is more beneficial to capturing signals, and can correctly achieve timing synchronization of signals by searching the peak positions at the same time; and on the basis, a synchronous code sequence provided by ECMA-368 is used to achieve frame synchronization so as to realize frequency deviation evaluation. Compared with the traditional ultra wideband synchronization method, the method provided by the invention has universality and accuracy.

Description

technical field [0001] The invention belongs to the technical field of short-distance wireless communication, and in particular relates to a synchronization method for an Orthogonal Frequency Division Multiplexing Ultra Wideband ("OFDM-UWB" for short, full name "Orthogonal Frequency Division Multiplexing-Ultra Wideband") communication system. Background technique [0002] Ultra-wideband (UWB) technology is an emerging wireless communication technology that has received widespread attention at present. Because of its huge bandwidth, large system capacity, high transmission rate in a short distance, and strong anti-multipath ability, it has been widely used. It is regarded as the most potential transmission technology for short-distance, high-speed wireless connections, and has broad application prospects. OFDM-UWB is one of the UWB carrier modulation schemes. It is based on OFDM technology and is compatible with many advantages of OFDM technology. Synchronization is the firs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B1/69H04L25/03
Inventor 蒋良成常洪雨徐仲宁杜永强王捷李进学王海杨金凯
Owner SOUTHEAST UNIV
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