Title :
Noncausal filters in multipath channel shaping
Author :
Abreu, E. ; Mitra, Sanjit ; Marchesani, R.
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA, USA
Abstract :
The use of the Viterbi algorithm in its simplified versions for detection of a data sequence is more effective in the case of minimum phase channels. A method is proposed for equalization of nonminimum phase channels. It employs noncausal allpass filters operating in reversed time. A minimum phase channel is obtained without enhancing the noise level. The method can be modified to obtain a desired impulse response with few nonzero samples with only minor variations in noise level providing significant complexity reduction in the Viterbi algorithm. Several simulation results are presented to illustrate the capability of the proposed method
Keywords :
Viterbi detection; all-pass filters; filtering theory; multipath channels; Viterbi algorithm; complexity reduction; data sequence; impulse response; minimum phase channels; multipath channel shaping; noncausal allpass filters; nonminimum phase channels; Additive noise; Decoding; Delay; Filters; Gaussian noise; Intersymbol interference; Multipath channels; Noise level; Phase detection; Viterbi algorithm;
Conference_Titel :
Circuits and Systems, 1993., ISCAS '93, 1993 IEEE International Symposium on
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-1281-3
DOI :
10.1109/ISCAS.1993.393827
