Pulse or digital communications – Transmitters
Patent
1997-03-28
1999-09-14
Ghebretinsae, Temesghen
Pulse or digital communications
Transmitters
375298, H04L 2704, H04L 2736
Patent
active
059533773
ABSTRACT:
A transmitter includes a repetition encoder generating a repetition code sequence having a word length of r bits by carrying out a repetition coding with respect to 1 bit of a transmission unit which divides transmission information by a predetermined word length, where a rate of the repetition coding is set equal to a reciprocal of a predetermined integer r, a tree encoder generating a tree code sequence by carrying out a tree coding with respect to the other bits of the transmission unit, where a rate of the tree coding is set to k
, k denotes an information block length and n denotes a code block length, a mapping part carrying out a mapping with respect to a combination of the repetition code sequence generated by the repetition encoder and the tree code sequence generated by the tree encoder, based on a set partitioning while maintaining correspondence between the mapping and the transmission unit, and a modulator generating a transmitting wave signal by carrying out an M-ary modulation scheme with respect to a carrier wave signal based on the combination which is mapped by the mapping part, and transmitting the transmitting wave signal to a radio channel. The predetermined word length is (1+rk/N) bits, and N denotes a number of transmission symbols indicated by a single branch of a trellis diagram indicating a sequence of the tree code sequence. The modulator modulates the carrier wave signal by 2.sup.(1+n/N) levels.
REFERENCES:
patent: 5150381 (1992-09-01), Forney, Jr. et al.
patent: 5289501 (1994-02-01), Seshadri et al.
patent: 5544328 (1996-08-01), Seshadri
Fujitsu Limited
Ghebretinsae Temesghen
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