Synchronization method of differential chaos shift keying or frequency-modification differential chaos keying ultra wideband system

A differential chaotic keying, ultra-wideband technology, applied in transmission systems, synchronization devices, digital transmission systems, etc., can solve problems such as non-periodicity, inapplicability, and different waveforms, achieving low computational complexity and reduced implementation complexity. degree, the effect of shortening the time

Inactive Publication Date: 2015-03-04
CHINA YOUKE COMM TECH
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Problems solved by technology

However, this idea is only applicable to the traditional UWB system where the transmitter sends periodic waveforms, but not to the DCSK/FM-DCSK UWB system, because the chaotic waveform of DCSK/FM-DCSK is not fixed, not Periodic, even if the same symbol

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  • Synchronization method of differential chaos shift keying or frequency-modification differential chaos keying ultra wideband system
  • Synchronization method of differential chaos shift keying or frequency-modification differential chaos keying ultra wideband system
  • Synchronization method of differential chaos shift keying or frequency-modification differential chaos keying ultra wideband system

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] Such as figure 2 Shown is the FM-DCSK UWB system block diagram that the present invention relates to (will figure 1 The removal of the frequency modulator in is the system block diagram of DCSK UWB). The ultra-wideband chaotic signal generator generates an ultra-wideband chaotic signal p(t) with a chaotic pulse width Tw. The signal s(t) transmitted by the transmitter can be expressed as:

[0027] (1)

[0028] Among them, k is the symbol sequence number, T is the symbol period, For the sent data information.

[0029] What the channel model of the present invention adopts is the tapped delay line model of IEEE 802.15.4a, and the impulse of channel

[0030] The response can be expressed as:

[0031] (2)

[0032] Among them, L is the number of resolvable multipath taps, and resp...

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Abstract

The invention relates to a synchronization method of a differential chaos shift keying or frequency-modification differential chaos keying ultra wideband system. The synchronization method comprises the following steps: step 1, averagely dividing an initial search region into four secondary regions, compressing the search region into one of the secondary regions by a method of adopting the characteristics of quite high autocorrelation and quite weak cross correlation of chaos signals and comparing the energy of useful signals collected in each secondary region, and letting n be equal to 2; step n, averagely dividing the search region determined in the last step into two secondary regions, setting the midpoint of each secondary region as an integral start point, comparing the two obtained integral results, determining the region of the larger integral result as a new secondary region, setting the midpoint of the secondary region as an estimated synchronization time, letting n be equal to N+1, ending the algorithm if n is larger than N, otherwise executing the n step of algorithm. The method disclosed by the invention greatly shortens the time needed by synchronization and is quite low in computation complexity so that the implementation complexity of a receiver is effectively reduced.

Description

Technical field [0001] The invention involves a superbody system synchronization method for differential chaos key control or frequency regulation differential chaos key control. Background technique [0002] Since the 2002 Federal Communications Commission (FCC, Federal Communications Commission) opens the UWB, Ultra-WideBand transmission band, due to its broad application prospects in the field of short-distance wireless communication, especially in Wireless Domain Network (WPANSThe huge potential market for Wireless Personal Area Networks), Wireless, Wireless Body Area Networks, and Wireless Sensor Networks, ultra -broadband has caused more and more researchers in academic and industry to research (L.. Yang and g. B. Giannakis, "Ultra-Wideband Communications: An Idea Whose Time Time has come," IEEE SIGNAL PROC. Mag., Vol. 21, NO. 6, PP. 26-54, Nov. NOV. 2004).On the other hand, because chaotic modulation technology has the advantages of easy implementation, low cost, and low p...

Claims

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Application Information

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IPC IPC(8): H04L7/00
Inventor 张健荣陈绍元赖克中
Owner CHINA YOUKE COMM TECH
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