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Relay-based distributed collaborative spectrum perception method

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

Active Publication Date: 2015-12-30
HARBIN INST OF TECH
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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

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  • Relay-based distributed collaborative spectrum perception method
  • Relay-based distributed collaborative spectrum perception method
  • Relay-based distributed collaborative spectrum perception method

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specific Embodiment approach 1

[0023] The relay-based distributed cooperative spectrum sensing method in this embodiment combines Figure 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 recei...

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] y 1 d ( 1 ) = θh p 1 ( 1 ) s p ( 1 ) + w ( 1 ) - - - ( ...

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Abstract

The invention provides a relay-based distributed collaborative spectrum perception method, belongs to the field of wireless spectrum allocation and utilization, and is to solve the problems that an existing distributed spectrum perception method is low in spectrum utilization rate, and a suddenly-appeared authorization user disturbs authorization user information transmission and separation between authorization user information and perception user information. The relay-based distributed collaborative spectrum perception method comprises the following steps: the authorization user obtaining and sending signals, a perception user obtaining larger signal power being a perception user U1, and the other one being a perception user U2; and taking the perception user receiving the larger signal power from the authorization user as a relay, and by adopting an amplify-forward (AF) protocol, assisting the other perception user to carry out spectrum perception and signal transmission. The method can improve detection probability of the perception user end, and meanwhile, can improve spectrum efficiency of the system under the condition of ideal channel estimation and signal separation.

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 Applications(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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