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Blind estimation bit synchronization method for differential chaotic modulation communication system

A communication system and chaotic modulation technology, applied in the field of bit synchronization, can solve the problems of occupying data transmission bandwidth, few bit synchronization mechanisms, etc., and achieve the effect of good synchronization performance

Inactive Publication Date: 2012-10-31
XIAMEN UNIV
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Problems solved by technology

The establishment time of data-assisted synchronization is generally faster than blind estimation synchronization, but the disadvantage is that it occupies part of the data transmission bandwidth
At present, the bit synchronization research on differential chaotic modulation is basically based on the data-assisted method, and rarely involves the research on the bit synchronization mechanism of the blind estimation method.

Method used

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  • Blind estimation bit synchronization method for differential chaotic modulation communication system
  • Blind estimation bit synchronization method for differential chaotic modulation communication system
  • Blind estimation bit synchronization method for differential chaotic modulation communication system

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Embodiment Construction

[0035] The framework of the differential chaotic modulation communication system applying the method of the present invention is as follows: figure 1 As shown, wherein the bit synchronization detection module at the receiving end adopts the method of the present invention. Said blind estimation bit synchronization method flow process of the present invention is as follows figure 2 As shown, the block diagram of its realization device is shown in image 3 shown. The specific workflow is as follows:

[0036] In the first step (201), at first the received signal is down-converted to a baseband signal, which is used as the input of the analog-to-digital converter 31 after passing through the anti-aliasing filter circuit, and the digital discrete signal r(k) is generated after being sampled by the analog-to-digital converter 31, Serves as the input to the bit synchronization detection circuit. According to the Nyquist sampling theorem, the sampling frequency f of the analog-to...

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Abstract

The invention discloses a blind estimation bit synchronization method for a differential chaotic modulation communication system and relates to a bit synchronization method based on the chaotic spread spectrum technology in the field of digital mobile communication. The invention provides the blind estimation bit synchronization method for the differential chaotic modulation communication system.In the blind estimation bit synchronization method, the characteristics of carrier waveform repetition and energy conservation of reference and modulation parts in a differential chaotic modulation signal are utilized, a local relative maximum value which is more than a synchronous threshold is searched and is used as an initial synchronization point of a local clock, and a digital phase-locked loop is used to perform the tracking synchronous adjustment of subsequent relative peak value, so that the establishing speed and accuracy of the bit synchronization are considered.

Description

technical field [0001] The invention relates to a bit synchronization method based on chaotic spread spectrum technology in the field of digital mobile communication, in particular to a blind estimation bit synchronization implementation method for a differential chaotic modulation communication system. Background technique [0002] Due to the wide spectrum characteristics of the chaotic carrier, the chaotic spread spectrum communication system does not require an additional spread spectrum circuit, thereby reducing the complexity of the system. It has the characteristics of simple structure, low power consumption, and low cost. One of the main branches, and has been included in the IEEE802.15.4a LR-WPAN specification for practical application. Differential chaotic modulation is one of the most practical and best performance chaotic modulation methods. [0003] The receiving part of the differential chaotic modulation generally adopts non-coherent demodulation, and the data...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L7/00H04L25/03H04L27/00
Inventor 李晓潮林肖凡郭东辉
Owner XIAMEN UNIV
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