Title :
Block codes for efficient multistage encoded modulation
Author :
Pessoa, Antonio C F ; Arantes, Dalton S.
Author_Institution :
CPqD-Telebras, Sao Paulo, Brazil
Abstract :
The design of multistage block codes using known tabulated codes is presented for efficient encoded modulation schemes. With the use of the best known binary block codes of lengths less than or equal to 128, it is possible to achieve very high coding gains with multistage decoding. Besides, great flexibility can also be achieved by allowing bandwidth expansion in the interval [1, m/(m-1)], where 2m is the number of signal elements in the modulation system. Finally, an asymptotically optimum decoding algorithm is presented which can be designed with the use of known (binary) unidimensional decoders. As a result, multilevel block encoded modulation can be implemented with low complexity decoders
Keywords :
block codes; decoding; encoding; asymptotically optimum decoding algorithm; bandwidth expansion; binary block codes; binary decoders; coding gains; linear codes; low complexity decoders; modulation system; multilevel block encoded modulation; multistage block codes; multistage decoding; multistage encoded modulation; signal elements; tabulated codes; unidimensional decoders; Algorithm design and analysis; Bandwidth; Binary codes; Block codes; Decoding; Digital communication; Digital modulation; Electronic mail; Modulation coding; Time division multiple access;
Conference_Titel :
Signals, Systems and Computers, 1993. 1993 Conference Record of The Twenty-Seventh Asilomar Conference on
Conference_Location :
Pacific Grove, CA
Print_ISBN :
0-8186-4120-7
DOI :
10.1109/ACSSC.1993.342309
