High bit-rate digital mobile radio transmission with a decision feedback equalizer

High bit-rate digital mobile radio transmission performance in a selective fading environment is discussed. Analysis and computer simulation show the amount of performance improvement by utilizing a preset-type decision feedback equalizer. The equalizer adopts the recursive least-squares (RLS) algorithm for tap coefficient determination. The performance is approximately analyzed by using the zero-forcing criterion. This criterion is separately applied to the minimum and nonminimum phase conditions of the two-wave selective fading model. The improved performance is almost equivalent to that of two-branch selection diversity reception. Finally, hardware implementations of a dynamic selective fading simulator and a decision feedback equalizer are demonstrated