3 Propagation issues for cognitive radio
Larry J. Greenstein, Andreas F. Molisch, and Mansoor Shafi
The fundamental principal of cognitive radio (CR) is to detect other radios in the environment that are using the same spectral resources, and to then deploy transmission and reception strategies that permit secondary users to communicate, while minimizing interference to and from those radios. For the design, analysis, and implementation of such transmission and reception strategies, it is essential to understand the relevant propagation channels . The power emitted by a transmitter (TX) might be determined by the system designer, but it is the channel that dictates how much of it arrives as useful power at the ...