원문정보
초록
영어
In cognitive radio (CR), secondary users (SUs) are able to sense the absence of primary users (PUs) in the spectrum. Then, SUs use this information to opportunistically access the licensed spectrum in the PUs’ absence. In this paper, we present an implementation of real-time video transmission with spectrum-sensing between two points using GNU Radio and a National Instruments 2900 Universal Software Radio Peripheral (USRP). In our project, spectrum-sensing is implemented at both transmitter and receiver. The transmitter senses the channel, and if the channel is free, a video signal (which could be a real-time signal from a video file) will be modulated and processed by GNU Radio and transmitted using a USRP. A USRP receiver also senses the channel, but in contrast, if the channel is busy, the signal is demodulated to reproduce the transmitted video signal. This project brings in several challenges, like spectrum-sensing in the devices’ environment, and packets getting lost or corrupted over the air.
목차
1. Introduction
2. Theory
3. Experiments
3.1 Hardware/Software Overview
3.2 System Implementation
3.3 Spectrum Sensing
3.4 Video Transmission
4. Results and Discussion
4.1 Implementation of Video Transmission with H.264 and MP4 on a Specific Channel
4.2 Implementation of Spectrum Sensing with Video Transmission at Transmitter and Receiver
5. Conclusion
Acknowledgment
References