Title :
When has a decision-directed equalizer converged?
Author :
Kennedy, Rodney A. ; Pulford, Graham ; Anderson, Brian D O ; Bitmead, Robert R.
Author_Institution :
Dept. of Syst. Eng., Australian Nat. Univ., Canberra, ACT, Australia
fDate :
8/1/1989 12:00:00 AM
Abstract :
Adaptive decision-directed equalizers can become locked for long periods onto incorrect equilibria. A test involving data available at the equalizer output is proposed for determining whether an equilibrium is correct or not, up to a fixed overall delay. If an independent sequence of random variables taking values ±1 is the input to a finite impulse response filter, and the output of the filter is passed through a slicer, then the slicer output is uncorrelated if and only if it is a delayed version of the filter input. An analogous result for M-ary rather than binary data is outlined
Keywords :
convergence; decoding; equalisers; filtering and prediction theory; information theory; M-ary data; adaptive decision-directed equalisers; decoding; equilibrium; finite impulse response filter; slicer; Australia; Communications Society; Delay; Equalizers; Finite impulse response filter; Labeling; Random variables; Systems engineering and theory; Telecommunications; Testing;
Journal_Title :
Communications, IEEE Transactions on
