Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Patent
1999-06-11
2000-05-02
Ghebretinsae, Temesghen
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
375316, H04L 2706
Patent
active
060581468
ABSTRACT:
A transmitter includes a repetition encoder generating 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 generates 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 denoting an information block length and n denoting a code block length. A mapping part performs 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. A modulator generates 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 transmits 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: 5159610 (1992-10-01), Eyuboglu et al.
patent: 5289501 (1994-02-01), Seshadri et al.
patent: 5446758 (1995-08-01), Eyuboglu
patent: 5544328 (1996-08-01), Seshadri
Fujitsu Limited
Ghebretinsae Temesghen
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