Document Type
Patent
Publication Date
October 2013
Patent Number
8571136
Abstract
Modulated orthogonal frequency division multiplexing (OFDM) subcarriers generate high sidelobes, resulting in adjacent channel interference (ACI). Current sidelobe suppression techniques, such as inserting guard intervals or cancellation carrier bands, diminish the useful radio spectrum or consume significant wireless device resources. Disclosed is a method of suppressing sidelobes through adding an adaptive extension to OFDM symbols that is calculated to avoid ACI while keeping power consumption to low levels. Bandwidth and user location information are collected by a cognitive radio an utilized to determine the extension used. The method significantly reduces ACI to other bands and reduces the required guard bands, opening the radio spectrum to more efficient use.
Application Number
12/275,721
Recommended Citation
Mahmoud, Hisham A. and Arslan, Huseyin, "Adaptive symbol transition method for OFDM-based cognitive radio systems" (2013). USF Patents. 254.
https://digitalcommons.usf.edu/usf_patents/254
Assignees
University of South Florida
Filing Date
11/21/2008
Primary/U.S. Class
375/296
