Abstract:

A time-varying channel coefficients of data-directed equalization algorithm (VCC-DDEA) is proposed for single tone narrow-band high frequency communication. The channel coefficient is estimated at each symbol sampling time based on adaptive tracking algorithm. The inter-symbol interface caused by training sequences is eliminated，then the user data is estimated as well based on least sum square error(LSSE) criterion. The demand that the channel coefficients being constant for DDEA in the frame is broken through VCC-DDEA and a conspicuous performance improvement is obtained.

Key words: narrow-band high frequency channel, data-directed equalization algorithm, matrix LU decomposition