"This thesis examines the benefits of using adaptive modulation in terms of spectral efficiency and probability of bit error for cognitive radio networks. In channels that fluctuate dynamically over time, systems that are based upon the conventional methods of fixed modulation formats do not perform well. Adaptive modulation provides many parameters that can be adjusted relative to the channel fading, including data rate, transmit power, instantaneous BER, symbol rate, and channel code rate or scheme. In this thesis, a systematic study on the increase in spectral efficiency obtained by optimally varying combinations of the modulation formats for a cognitive radio is provided...Simulations show how adaptively changing the modulation schemes improves the performance of the system by meeting a BER constraint over a range of SNR"--Abstract, page iii.
Kosbar, Kurt Louis
Grant, Steven L.
Moss, Randy Hays, 1953-
Electrical and Computer Engineering
M.S. in Electrical Engineering
Missouri University of Science and Technology
vii, 46 pages
© 2008 Gaurav Sharma, All rights reserved.
Thesis - Open Access
Library of Congress Subject Headings
Adaptive signal processing
Print OCLC #
Electronic OCLC #
Link to Catalog Record
Sharma, Gaurav, "Adaptive modulation for cognitive radios" (2008). Masters Theses. 6831.