SIGNAL DESIGN TECHNIQUES. VOLUME V. PERFORMANCE OF EASILY IMPLEMENTED ERROR REDUCTION TECHNIQUES.
Rept. for Feb 63-Dec 64,
PURDUE UNIV LAFAYETTE IND SCHOOL OF ELECTRICAL ENGINEERING
Pagination or Media Count:
Several techniques designed to reduce the probability of error in the transmission of digital data are evaluated. Three coding techniques are investigated, and the perlimit error probability at the decoder output, as a function of that at its input, is obtained for each of the three. The three codes are the Hamming SEC code and the Wagner code both considered as forward error correcting techniques and as error detection methods for a repeat-request system and the Hamming DED code, which is additionally analyzed when operating in a partial error correcting, partial repeatrequest mode. Finally, the merit and, where applicable, the required feedback channel capacity are computed and presented graphically. Two reception techniques are also investigated. The first of these techniques is the null zone system each transmission of a limit results in a simple accept-or-reject decision by the receiver and in retransmission until acceptance is obtained. The second technique, which is first postulated in this study, is essentially a timequantized version of sequential reception and is, therefore, termed a pseudo-sequential system. Author