Power Reduction in OFDM based Cognitive Radio Systems
Journal Title: The International Journal of Technological Exploration and Learning - Year 2013, Vol 2, Issue 3
Abstract
The increasing demand for wireless communication introduces efficient spectrum utilization challenge. To address this challenge, cognitive radio has emerged as the key technology, which enables opportunistic access to the spectrum. The main potential advantages introduced by cognitive radio are improving spectrum utilization and increasing communication quality. In this paper, we consider the high peak-to-average power ratio (PAPR) problem of orthogonal frequency division multiplexing (OFDM) signals in cognitive radio systems. A high PAPR can lead to saturation in the power amplifier (PA) of secondary users (SUs) and consequently increase spectral spreading, and cause interference to adjacent primary users (PUs).Simulation results illustrates the performance of the system under Additive White Gaussian Noise (AWGN) and further evaluation is done for comparing the proposed companding technique with previous techniques. The power spectral density (PSD) and bit error rate (BER) are evaluated at the output of the nonlinear PAs to provide a realistic performance comparison.
Authors and Affiliations
B. Ragini| CMR Technical Campus, Hyderabad, Jawaharlal Nehru technological University, Hyderabad, Andhra Pradesh, India, M. Sravanthi| CMR Technical Campus, Hyderabad, Jawaharlal Nehru technological University, Hyderabad, Andhra Pradesh, India, B. Karunasree| CMR Technical Campus, Hyderabad, Jawaharlal Nehru technological University, Hyderabad, Andhra Pradesh, India
Keywords
Related Articles
- EP ID EP8476
- DOI -
- Views 386
- Downloads 21
Max Min Sorting Algorithm
There are many popular problems in different practical fields of computer sciences, database applications, etc. One of these basic operations is the sorting algorithm. It has attracted a great deal of research. A lot...
Implementation of Different Low Power Multipliers Using Verilog
Low power consumption and smaller area are some of the most important criteria for the fabrication of DSP systems and high performance systems. Optimizing the speed and area of the multiplier is a major design issue....
Robust Face Recognition under Difficult Lighting Conditions
This paper addresses the problem of illumination effects on Face recognition and works for an approach to reduce their effect on recognition performance. More broadly, a simple and efficient preprocessing chain that e...
Digital Radar For Efficient Surveillance
The aim of the work is to provide a high efficient surveillance for very costly material like jewelry, gold ornaments and diamonds. In this work an ultra-sonic sensor is collaborated with the digital radar, this senso...
An Overview and Analysis of Private and Public Key DNA Cryptography
with the growth of technological advancements, the threats dealt by a user grow exponentially. Hence security has become a critical issue in data storage and transmission. As traditional cryptographic systems are now...