Title :
A first approach to concatenation of coding and spreading for CDMA-systems
Author :
Frey, Thomas ; Bossert, Martin
Author_Institution :
Dept. of Inf. Technol., Ulm Univ., Germany
Abstract :
This paper presents an approach to combine error correcting coding with spreading in CDMA (code division multiple access) systems. The spreading is described in a very general way by means of block coding, that includes the `normal´ antipodal direct-sequence (DS) spreading and also the spreading with orthogonal sequences (M-ary transmission), but is not restricted to them. Applying this description of spreading as coding, the complete system can be regarded as a concatenated code, consisting of the outer channel code and the inner spreading code. This allows an overall optimization of coding and spreading by constructing powerful codes as well as delivering good decoding algorithms
Keywords :
block codes; channel coding; code division multiple access; concatenated codes; error correction codes; maximum likelihood decoding; optimisation; pseudonoise codes; spread spectrum communication; AWGN channel; CDMA systems; M-ary transmission; Qualcomm system; antipodal direct-sequence spreading; block coding; code division multiple access; coding optimization; concatenated code; concatenation; decoding algorithms; error correcting coding; inner spreading code; orthogonal sequences; outer channel code; spreading; Bandwidth; Block codes; Channel coding; Computer errors; Decoding; Error correction codes; Fading; Information technology; Land mobile radio; Multiaccess communication;
Conference_Titel :
Spread Spectrum Techniques and Applications Proceedings, 1996., IEEE 4th International Symposium on
Conference_Location :
Mainz
Print_ISBN :
0-7803-3567-8
DOI :
10.1109/ISSSTA.1996.563209
