Ehler Fisher Transform

The Ehler Fisher Transform indicator, devised by John Ehler, is of recent conception, in fact it was first published in 2002. With clear turning points and a fast response, the Ehler Fisher Transform is used to identify trend reversals and is based on the assumption that prices behave like a square wave and do not follow a Gaussian or normal distribution.
BUY and SELL signals are generated when Fisher crosses over or below the trigger line, which is Fisher of a previous bar. So a BUY signal is generated when the Fisher line crosses the threshold -1 upwards and passes over the trigger line. A SELL signal is generated when the Fisher line crosses down the threshold 1 and crosses below the trigger line.