Cooperation spectrum sensing method based on network encoding

A collaborative spectrum sensing and network coding technology, applied in transmission monitoring, digital transmission systems, electrical components, etc., can solve problems such as inability to achieve error-free transmission

Active Publication Date: 2010-07-28
PLA UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to propose a cooperative spectrum sensing method based on network coding for the problem that error-free transmission cannot be realized under non-ideal conditions of the reporting channel

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  • Cooperation spectrum sensing method based on network encoding
  • Cooperation spectrum sensing method based on network encoding
  • Cooperation spectrum sensing method based on network encoding

Examples

Experimental program
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Embodiment 1

[0079] In this example, if figure 1As shown, there is an authorized user, multiple cognitive users and a base station in the cooperative spectrum sensing system, and only some cognitive users upload sensing information through the report channel. Assuming that the optimal relay node has been selected, taking the uploading of two cognitive users CR1 and CR2 as an example, it is discussed how to use the interaction information between cognitive users to improve the reliability of perceptual information transmission.

[0080] The flow of this embodiment is as follows image 3 shown, including the following steps:

[0081] Collaborative Network Coding Design Method

[0082] (a). Cognitive users use the energy perception method for local perception, that is, the energy value is accumulated over a period of time Where y(i) is the signal received by the cognitive user, u is the time-bandwidth product; the cognitive user makes a local decision, that is, compares θ with the set thr...

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Abstract

The invention relates to a cooperation spectrum sensing method based on network encoding. The method comprises the following steps of: carrying out local spectrum sensing by a cognition user, and selecting a cognition node which is not sensed but has good receiving property as a relay node; carrying out interaction on the information of the cognition user by the cognition node used as the relay node through network encoding; transmitting the sensing information to an integration center by the cognition user through space time encoding after obtaining the sensing information of other users; and judging the integration by the integration center by using the results of network decoding and space time decoding. In the invention, the relay nodes with good property is selected, network encodingis used on the relay nodes, which enhances the probability of the interaction success of the cognition information; and the sensing information after interaction by the cognition user is sent throughthe space time encoding, thereby enhancing the reliability of the sensing information transmission, and furthermore enhancing the property of the cooperation spectrum sensing.

Description

technical field [0001] The invention relates to a method for implementing spectrum sensing in the field of digital communication, in particular to a sensing method that can be adopted when the reporting channel is not ideal, and in particular to a cooperative spectrum sensing method based on network coding. Background technique [0002] Transmission effectiveness and reliability are two performance indicators of communication systems. Cooperative diversity technology utilizes other users' antennas as relays to realize "virtual antenna" space transmission diversity, thereby improving system reliability. In cognitive radio, the cooperative spectrum sensing methods currently studied are all based on the following assumptions: the transmission of sensing information between cognitive users and the fusion center is ideal, that is, error-free transmission can be achieved on the reporting channel, but in practice some It is difficult to meet the above transmission conditions, so ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/00H04L1/00H04B17/309
Inventor 吴启晖王金龙郑学强任国春陈瑾程云鹏
Owner PLA UNIV OF SCI & TECH
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