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Relay transmission-based cognitive network spectrum sensing method

A spectrum sensing and cognitive network technology, which is applied to the cognitive network spectrum sensing based on relay transmission. For the sensing field of system spectrum resources, it can solve problems such as unsolved problems and increased time overhead.

Inactive Publication Date: 2010-12-29
XI AN JIAOTONG UNIV
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  • Abstract
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Problems solved by technology

It is difficult for current methods to consider the above three problems at the same time. Some methods can reduce the interference of secondary users to authorized users, but make secondary users perceive the time overhead of authorized users to increase; On the one hand, it reduces the interference of the secondary user to the authorized user, and on the other hand, it also reduces the time overhead of the secondary user's perception, but it does not solve the problem of the accuracy of the secondary user to the authorized user when the authorized user is far away from the secondary user. perception problem

Method used

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  • Relay transmission-based cognitive network spectrum sensing method
  • Relay transmission-based cognitive network spectrum sensing method
  • Relay transmission-based cognitive network spectrum sensing method

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Embodiment Construction

[0044] The present invention is described in further detail below in conjunction with accompanying drawing:

[0045] first attached figure 1 The specific implementation scenario is given. The secondary user system adopts the AF (Forward Amplification) protocol, and the authorized user node P u , the secondary user node S u , destination node D s , the relay relays have M nodes, assuming that each node has a transmitting and receiving antenna, the channel from the secondary user to the i-th relay node is f i , the channel from the i-th relay node to the destination node is g i , the channel from the authorized user to the i-th relay node is h pi , the channel from the authorized user to the secondary user is h p , these channels are all independent complex Gaussian distributions with zero expectation and unit variance, d ps is the distance between the authorized user and the secondary user, d pr is the distance between the authorized user and the relay node, and the path...

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Abstract

The invention discloses a relay transmission-based cognitive network spectrum sensing method. The method comprises the steps that: (1) a relay node is set between a secondary user source node and a target node; (2) the secondary user source node sends a data signal to the relay node; and (3) the relay node receives the signal in a first stage and amplifies and forwards the signal in a second stage; and (4) the secondary user source node receives the signal in the second stage, wherein the signal sent by the secondary user source node is known, the signal of the secondary user source node is removed from the forwarded signals received by the secondary user source node, the rest signal is processed by an energy detection method, and thus, whether an authorized user signal exists can be judged. In the method, the cooperation characteristics of the secondary users are used, a relay node transmission detection method is adopted, and due to a two-stage time division transmission protocol which is regularly used in the relay transmission, the secondary user source node does not require occupy extra time for the spectrum detection, so that the performance of the system is improved.

Description

Technical field: [0001] The invention relates to the field of wireless communication, and relates to a method for sensing system frequency spectrum resources in a cognitive system. In particular, a relay transmission based spectrum sensing method for cognitive networks. Background technique: [0002] Cognitive radio technology can significantly improve the spectrum efficiency of wireless communication systems and solve the contradiction between the scarcity of spectrum resources and low spectrum utilization, which has become a research hotspot in recent years. The discontinuity of time and space used by the existing spectrum registration network for the allocated spectrum makes most of the licensed frequency bands not fully utilized in time and space. Therefore, the secondary users in the cognitive radio network realize dynamic spectrum access through opportunity sharing, and can share the spectrum with the licensed system without changing the protocol of the original licen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/00H04B17/382
Inventor 廖学文任品毅姜琪高贞贞朱世华
Owner XI AN JIAOTONG UNIV
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