Cognitive Radio - 802.22
CR Cognitive Based UAV Simulations in NetSim
NetSim Versions Academic Standard Pro Applicable Releases v14.1 Objective: To introduce UAV mobility in CR CPE devices of Cognitive Radio networks. Steps to setup NetSim to introduce mobility options in the CR CPE devices of Cognitive Radio networks. ...
How to calculate Spectral Efficiency in Cognitive Radio Networks through Packet Trace?
In NetSim CR networks, Spectral efficiency is defined as the fraction of time the channel is busy. It is ChannelBusyTime/TotalSimulationTime. This metric is available in the CR Channel Metrics in the NetSim results dashboard. The Spectral Efficiency ...
NetSim - MATLAB Interfacing for UAV/Drone/Flying, Cognitive Radio Networks
Applicable Versions NetSim Standard Applicable Releases v13.3 MATLAB Version R2019b or above MATLAB Toolbox MATLAB, Simulink, Robotics and System Toolbox File Exchange Project of MATLAB Robotics System Toolbox UAV Library Visual Studio Community ...
Understanding 802.22 Superframe structure using NetSim Packet Trace log file
Applicable Versions NetSim Standard NetSim Pro The MAC layer of 802.22 protocol will consist of two structures, namely Frame and Superframe. Each frame consists of: Superframe preamble: is used for time synchronization Frame preamble: is used for ...
How to add spectrum sensing time in Cognitive Radio network?
Applicable versions NetSim Standard Netsim Pro Spectrum sensing is one of the most important components of cognitive radio (CR) technology. The delays in sensing idle channels for SU data will have a direct impact on how fast secondary user (SU) data ...
How I delay the sensing of the primary (incumbent) by the secondary?
Applicable versions NetSim Standard Netsim Pro Applicable Releases v12 v13 Let us say there is some delay in sensing the primary. This would mean that there is a delay in sending the UCS. To incorporate this: Go to the line ...
How is the PHY data rate calculated in 802.22 Cognitive Radio?
Applicable Versions NetSim Academic NetSim Standard NetSim Pro Data rate in 802.22 depends on the following parameters · No. of bits per symbol · Coding rate · Cyclic prefix · Symbol duration Data rate in CR is calculated as Data Rate = Bit count in ...
Notes on Cognitive Radio implementation in NetSim
Given below are some important points users should keep in mind when running 802.22 cognitive radio simulations CR BS allocates max one symbol per CPE. If the generation rate is more than the data filled in one symbol then allocation fails and it ...
Why is it preferred to disable TCP in 802.22 simulations ?
In 802.22 simulations, the secondary stops transmissions when the primary comes on. Since the transmissions are stopped the TCP RTO Expires and window drops to one. Subsequently, for each packet whose ack is not received, the RTO doubles. Thus over ...
What packets does the SU send when it senses PU in 802.22 CR networks?
The Secondary Users (CR CPE) send UCS_Notification(Urgent Coexistence Situation) Packets to the Base Station when they detect the presence of Primary Users (incumbents) during Spectrum Sensing. The UCS notifications enable CPEs to transmit ...
How is spectrum sensing done in NetSim 802.22 library?
Applicable Versions NetSim Standard NetSim Pro Applicable Releases v12 v13 v14 The NetSim Cognitive Radio library enables spectrum usage detection based on the spatial relationship between the primary and secondary users, namely, whether the primary ...
How do secondary users switch channels in NetSim CR ?
The switching to another channel by the secondary user (CR CPE) occurs when the following conditions are satisfied: A primary user comes on and the secondary user is within its keep-out distance The start or end frequency of the secondary user’s ...
Primary User Emulation attack in Cognitive Radio
Cognitive Radio technology addresses the spectrum shortage problem by enabling unlicensed users equipped with CRs to coexist with incumbent users in licensed spectrum bands while causing no interference, and spectrum sensing is one of the essential ...