Cognitive Ultra Wideband Radio
نویسنده
چکیده
This paper introduce the concept of cognitive UWB radio, a wireless system based on UWB transmission able to self adapt to the characteristics of the surrounding environment. UWB is an promising underlying method for coexistence among different systems. However, the performance may not be as good as expected due to the changing spectrum environment. Thus, cognitive UWB radio is proposed by taking the advantage of cognition, which enables the radio to learn the spectrum environment by itself. Cognitive radio techniques enable flexible, efficient and reliable spectrum use.
منابع مشابه
An Ultra-Wideband Low Noise Amplifier and Spectrum Sensing Technique for Cognitive Radio
............................................................................................................. viiii CHAPTER
متن کاملCognitive Ultra Wide Band (CUWB) Radio – Implementation and Challenges
Software-defined radio (SDR), software radio (SWR), and cognitive radio (CR) are futuristic concepts that promise to significantly impact wireless communications technologies. Today, however, technology ironically is one of the limiting factors in the production of a true software radio that is capable of dynamically reconfiguring itself to meet user requirements or spectral limitations. Specif...
متن کاملUWB Impulse Radio Waveform Shaping Techniques for Narrow-Band Interference Rejection
-In ultra-wideband (UWB) impulse radio (IR) technology, it is important that the pulse shape be adjusted such that the power spectral characteristics not only satisfy the standard limits, but also be characterized by deep nulls at the locations of existing narrowband primary users. Cognitive Radio Technology (CR) is presented as a viable solution for UWB systems for narrowband interference supp...
متن کاملA Linearity-Improved Ultra-Wideband Balun-LNA for Cognitive Radio
An ultra-wideband low noise amplifier for cognitive radio applications covering 50 MHz to 10 GHz is designed in a 65-nm CMOS technology. A three-stage dc-coupled common source amplifier with RC degeneration at the last stage optimizes the gain, linearity and output gain-phase balancing. Throughout the covered band, the simulated voltage gain is >23.3 dB whereas the noise figure is <3.4 dB. The ...
متن کاملJoint Optimal Spectrum Sensing Time and Power Allocation in Ultra Wideband Cognitive Radio Networks
Ultra Wideband (UWB) system is overlapped with various wireless systems, such as WLAN, WiMax and UMTS, which limits the use of UWB. Cognitive Radio (CR) enables UWB systems to efficiently use the overlapped spectrum without causing interference to other wireless systems. In this paper, we focuses on the low-complexity joint optimization algorithm design with respect to transmit power allocation...
متن کامل