One problem with "cognitive radio" is that it seems it will be designed to detect only emissions similar to those it is meant to receive. Therefore, it is best used in spectrum particularly allotted to just those kinds of emissions. This rather defeats the purpose of "white space."
RMS Express by way of contrast has a busy detector that will prevent transmitting over many kinds of modulation different than it uses. Compare this with (say) ALE, whose polling (encountered on MARS frequencies) takes no account of voice or even Olivia on channels it happens to select. Cortland KA5S ----- Original Message ----- From: Phil Williams To: [email protected] Sent: 12/15/2009 1:21:30 PM Subject: Re: [digitalradio] cognitive radio systems;? I first heard of cognitive radio systems when efforts were underway to make use of the 'white space' in the television broadcast bands. The whole idea is to make more efficient use the the spectrum by putting situational awareness in to the client device. http://www.technologyreview.com/read_article.aspx?ch=specialsections&sc=emergingtech&id=16471 http://www.commsdesign.com/news/tech_beat/www.eet.com/showArticle.jhtml?articleID=18700443 philw
