My comment certainly generated some replies! COFDM seems to be one of the 'flavours of the month'. It does have a lot to offer where multipath is a problem, viz. digital broadcasting over HF through
Dear Andy, LF Group, I did try some experiments to do this in 2001 - the variable-phase modulator circuit is still available from G3YXM's web pages: http://www.wireless.org.uk/moritz.htm It isn't par