Method for transmitting high energy-efficient perceptual information based on LT code significance sampling

A technology of importance sampling and sensing information, applied in the field of sensing information transmission, it can solve the problems of high complexity and unsuitable for sensing nodes, and achieve the effect of not being damaged.

Inactive Publication Date: 2014-11-19
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

The document "Combined degree distribution: A simple method to design the degree distribution of fountain codes" in ICIST proposes a new way to combine several different degree distributions and integrate them into a method of degree distribution. The proposed The degree distribution has an optimal switching point, but the complexity of this method is high and it is not suitable for sensing nodes

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  • Method for transmitting high energy-efficient perceptual information based on LT code significance sampling
  • Method for transmitting high energy-efficient perceptual information based on LT code significance sampling
  • Method for transmitting high energy-efficient perceptual information based on LT code significance sampling

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Embodiment Construction

[0035] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0036] An energy-efficient perceptual information transmission method based on LT code importance sampling, comprising the following steps:

[0037] Step (1), when transmitting broadband cooperative spectrum sensing information, use LT codes to perform channel coding on the sensing information; including the following specific steps:

[0038] (1a), respectively determine the probability optimization values ​​corresponding to degree values ​​i=1 and i=2 through Monte Carlo simulation. During the simulation, the number of original information codes is K, the AWGN channel is used and the modulation method is BPSK modulation; after Monte Carlo simulation, the optimized value φ(1)=0.08 with a degree value of 1 and the probability of a degree value of 2 are obtained. The value φ(2)=0.49. When the degree value is 1, the degree distribution fluctuat...

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Abstract

The invention provides a method for transmitting high energy-efficient perceptual information based on LT code significance sampling in a cognitive radio wide band collaboration frequency spectrum perception network. Optimization degree distributed design based on LT code significance sampling is adopted to perform channel coding for perceptual information, so that the calculation complexity is lowered, the system performance is better optimized, and energy consumed during transmission process is effectively saved while the reliability of transmission of perceptual information is ensured; if a perceptual node is far away from a center node, a single-hop decoding forwarding relay method is adopted, so that the transmission energy consumption is further reduced; degree distribution optimization is adopted to select degree value to obtain a probability optimization value, corresponding optimization degree distributed design is obtained based on a robust solitary wave distribution function, and finally, normalization is performed on the designed optimization degree distribution to obtain a practical degree distribution. MATLAB simulation experiment proves that the method, compared with the conventional degree distribution, is improved in performance.

Description

technical field [0001] The present invention relates to a sensing information transmission method in broadband cooperative spectrum sensing of cognitive radio, in particular to an energy-efficient sensing information transmission method based on LT code importance sampling. Background technique [0002] As people's demand for wireless high-speed data transmission continues to grow, spectrum resources become increasingly scarce, and effective and reliable wireless spectrum access has become the focus of attention. Cognitive Radio technology (Cognitive Radio, CR) that has emerged in recent years is a new type of intelligent wireless communication technology that can sense the surrounding environment and significantly improve spectrum utilization, which can effectively solve the problem of spectrum resource shortage. [0003] Spectrum sensing is a key technology of cognitive radio. Through spectrum sensing, secondary users can quickly and reliably detect spectrum holes not occ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04W52/02
CPCY02D30/70
Inventor 钱丽宋晓勤汪淼李克牛英滔
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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