A Relay-Based Distributed Cooperative Spectrum Sensing Method

A distributed cooperative and spectrum sensing technology, applied in the field of distributed cooperative spectrum sensing, can solve the problems of low spectrum utilization, interference with authorized user information transmission, separation of authorized user information and cognitive user information, etc., to improve spectrum efficiency and improve The effect of detection probability

Active Publication Date: 2018-02-16
HARBIN INST OF TECH
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  • Summary
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  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing distributed spectrum sensing method has a low spectrum utilization rate, and the sudden emergence of authorized users interferes with the transmission of authorized user information and the separation of authorized user information and cognitive user information, and proposes a A Relay-Based Distributed Cooperative Spectrum Sensing Method

Method used

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  • A Relay-Based Distributed Cooperative Spectrum Sensing Method
  • A Relay-Based Distributed Cooperative Spectrum Sensing Method
  • A Relay-Based Distributed Cooperative Spectrum Sensing Method

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specific Embodiment approach 1

[0023] The relay-based distributed cooperative spectrum sensing method in this embodiment combines Image 6 As shown, the method is realized through the following steps:

[0024] Step 1. The authorized user obtains and sends the signal, and then estimates the signal power received by the two cognitive users from the authorized user, and the cognitive user with the estimated larger signal power is recorded as the cognitive user U 1 , another cognitive user is denoted as cognitive user U 2 ;

[0025] Step 2. In the first transmission time slot T 1 Time is the first time period, cognitive user U 2 To cognitive user U 1 Send a signal to the cognitive receiver Cognitive user U 1 Using Spectrum Sensing Signals Carry out energy detection, if an authorized user is detected, go to step 7, otherwise, go to step 3;

[0026] Step 3. In the first transmission time slot T 1 After the second transmission slot T 2 Time is the second time period, the cognitive user U 1 will receiv...

specific Embodiment approach 2

[0036] The difference from Embodiment 1 is that, in the relay-based distributed cooperative spectrum sensing method of this embodiment, the process for authorized users to obtain signals in Step 1 is as follows:

[0037] Step 11. In the cognitive user radio system, let the sinusoidal signal represent the sinusoidal signal sent by the authorized user, and let the Chirp signal represent the cognitive user U with different order 1 and cognitive user U 2 The transmitted signal; in the fractional domain, the Chirp signal is expressed as a pulse signal with a fairly narrow bandwidth, while the sinusoidal signal is expressed as a broadband signal with a wider bandwidth; it shows that the Chirp signal has the characteristics of energy accumulation in the fractional domain, while the sinusoidal Signal does not;

[0038] Step 12: Through the narrowband fractional domain filter, the cognitive user U 1 and cognitive user U 2 The signal of the authorized user is separated from the signa...

specific Embodiment approach 3

[0040] The difference from the specific embodiment 1 or 2 is that, in the relay-based distributed cooperative spectrum sensing method in this embodiment, the cognitive user U described in step 2 2 To cognitive user U 1 Send a signal to the cognitive receiver Cognitive user U 1 Using Spectrum Sensing Signals to the received signal During the energy detection process, the spectrum sensing signal Expressed as the following formula:

[0041]

[0042] in, Represents the signal sent by the authorized user in the first transmission slot, 2; θ represents the indicator of the existence of the authorized user, when θ=1, it represents the presence of the authorized user, and when θ=0, it represents the absence of the authorized user; Denotes the authorized user and the cognitive user U in the first transmission slot 1 The channel gain between; w (1) Indicates the noise received in the first transmission slot.

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Abstract

A relay-based distributed cooperative spectrum sensing method belongs to the field of wireless spectrum allocation and utilization. The existing distributed spectrum sensing method has the problems of low spectrum utilization, and the sudden appearance of authorized users interfering with the transmission of authorized user information and the separation of authorized user information and cognitive user information. A relay-based distributed cooperative spectrum sensing method, including: authorized users obtain and send signals, and the one with higher signal power is recorded as cognitive user U1, and the other is recorded as cognitive user U2; The cognitive user with high received signal power acts as a relay, and uses the Amplify and Forward (AF) protocol to assist another cognitive user in spectrum sensing and signal transmission. In the case of ideal channel estimation and signal separation, the present invention can improve the detection probability of the cognitive user end, and at the same time can improve the spectrum efficiency of the system.

Description

technical field [0001] The invention relates to a relay-based distributed cooperative spectrum sensing method. Background technique [0002] In recent years, with the surge of wireless users and the rapid growth of user data traffic, as well as the increase in user demand for wireless communication services, the utilization of spectrum resources in certain frequency bands has become very tight, while spectrum resources in other frequency bands have The utilization rate is not high. In order to solve this unreasonable phenomenon, cognitive radio technology based on spectrum sensing came into being. In the cognitive radio system, according to different functions, it is divided into cognitive users and authorized users. Authorized users are users who are allocated spectrum resources by the system, and cognitive users are users who occupy the allocated spectrum resources when authorized users are in a dormant state. users of spectrum resources. Compared with the traditional s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/382H04L27/00
Inventor 吴宣利韩杏玲王若楠马哲明吴玮李欣悦
Owner HARBIN INST OF TECH
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