Dynamic spectral shaping in cognitive radios with quality of service constraints

In this paper we consider cognitive radios (CR) that employ orthogonal frequency division multiplexing (OFDM) modulation at the physical layer and present an algorithm for transmitter adaptation subject to specified quality of service (QoS) constraints. The proposed algorithm explicitly considers mu...

Full description

Saved in:
Bibliographic Details
Published in2009 Conference Record of the Forty-Third Asilomar Conference on Signals, Systems and Computers pp. 539 - 543
Main Authors Joshi, Deepak R, Popescu, Dimitrie C, Dobre, Octavia A
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.11.2009
Subjects
Chromium
Cognitive radio
Digital modulation
Multipath channels
OFDM modulation
Physical layer
Quality of service
Radio transmitters
Signal to noise ratio
Wireless personal area networks
Online AccessGet full text

Cover

More Information
Summary:In this paper we consider cognitive radios (CR) that employ orthogonal frequency division multiplexing (OFDM) modulation at the physical layer and present an algorithm for transmitter adaptation subject to specified quality of service (QoS) constraints. The proposed algorithm explicitly considers multipath channels between the CR transmitter and its intended receiver, and performs joint spectral shaping and transmitter power control in order to avoid spectral bands used by licensed users of the spectrum while maintaining specified target signal-to-interference+noise-ratios (SINR) at the CR receiver. The algorithm is illustrated with numerical examples obtained from simulations in which dynamic scenarios are considered with licensed transmitters getting in and out of the system.
ISBN:1424458250
9781424458257
ISSN:1058-6393
2576-2303
DOI:10.1109/ACSSC.2009.5469886