Talk:Selective fading
Add topicLatest comment: 18 years ago by Sepia tone in topic Untitled 2007 comment
 | The content of the Selective fading page was merged into Fading on 2013-02-16, and it now redirects there. For the contribution history and old versions of the merged article, please see its history. |
Untitled 2007 comment
[edit]OFDM is not really a diversity scheem. Diversity schemes offer a diversity of radio paths/channels through time, spacial, frequency, polarisation diversity etc.
OFDM helps with selective fading because it offers a mitigation of the effect. A wide bandwidth (ie high data rate) service is multiplexed onto a large number of low data rate sub-carriers. In this way if selective fading loses a few of these low data rate sub-carriers, then the affect is not too bad. This is in contrast with diversity schemes which actually reduce the amount of fading by combining diverse signals.
-- OFDM with sub-carrier interleaving and forward error correction can be considered to be a diversity scheme. Sepia tone 08:12, 29 November 2007 (UTC)