Title :
Analysis on bit-error characteristics of channel codec in digital mobile communications system
Author :
Abe, Masami ; Shiino, Haruhiro ; Shoji, Yasuo
Author_Institution :
Oki Electr. Ind. Co. Ltd., Tokyo, Japan
Abstract :
A calculation algorithm for the bit likelihood in the π/4 shifted DQPSK (differential quadrature phase shift keying) is proposed, and the bit-error correction ability of the soft decision using the calculated likelihood is indicated. Some frames in which the bit errors are concentrated on the multipath fading channel are investigated, and the required equalizing ability to make the bit-error rate after the decoder less than 10-3 is shown. The effect of the bit-error concentration on the distribution of the bad frames is considered
Keywords :
codecs; digital radio systems; error correction; error statistics; fading; mobile radio systems; phase shift keying; π/4 shifted DQPSK; bit likelihood; bit-error characteristics; bit-error correction; bit-error rate; channel codec; decoder; differential quadrature phase shift keying; digital mobile communications system; multipath fading channel; soft decision; Bit error rate; Codecs; Communication industry; Convolutional codes; Decoding; Europe; Fading; Laboratories; Mobile communication; Viterbi algorithm;
Conference_Titel :
Vehicular Technology Conference, 1991. Gateway to the Future Technology in Motion., 41st IEEE
Conference_Location :
St. Louis, MO
Print_ISBN :
0-87942-582-2
DOI :
10.1109/VETEC.1991.140436
