A coding-theoretical view on code division multiple access: two new constructions of CDMA codes

Author

Lundqvist, Anders ; Anderson, Per-Olof

Author_Institution

Dept. of Electr. Eng., Linkoping Univ., Sweden

fYear

1994

fDate

8-10 Jun 1994

Firstpage

550

Abstract

Coding techniques for the multiple-access problem are investigated. Two constructions of code sequences are considered, one for the OR channel and one for the Gaussian channel. A new construction of codes for the OR channel, which belongs to the family of cyclically permutable (CP) codes also known as optical orthogonal codes, removes the constraint of frame synchronization. This new construction of CP codes can be derived from known codes for the synchronous situation. The construction of codes for the Gaussian channel is for the synchronous case and has an exponential increase in the number of sequences when the length increases. For both constructions, we discuss the ability to handle noise and near-far effects

Keywords

Gaussian channels; code division multiple access; cyclic codes; encoding; sequences; CDMA codes; Gaussian channel; OR channel; code division multiple access; code sequences; coding; cyclically permutable codes; near-far effects; noise effects; optical orthogonal codes; sequence length; Codes; Communication system control; Delay effects; Fading; Feedback; Gaussian channels; Mobile communication; Multiaccess communication; Performance analysis; Protocols;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1994 IEEE 44th

Conference_Location

Stockholm

ISSN

1090-3038

Print_ISBN

0-7803-1927-3

Type

conf

DOI

10.1109/VETEC.1994.345066

Filename

345066