Code selection for low complexity receivers in multi-carrier code division multiple access systems

Author

Freiberg, L. ; Bhargava, V.K.

Author_Institution

Dept. of Electr. & Comput. Eng., Victoria Univ., BC, Canada

fYear

1997

fDate

23-26 Feb. 1997

Firstpage

65

Lastpage

68

Abstract

Future multimedia wireless communications systems will require higher spectral efficiencies, with decreased receiver complexity. MC-CDMA systems can increase spectral efficiency when employing the proper spreading code. Short codes can be used in MC-CDMA, since a high processing gain is not required. Short codes allow the use of maximum likelihood detection, thereby providing a simple form of multi-user detection. In contrast, correlation receivers are also feasible, since orthogonal codes are possible in an MC-CDMA structure. Correlation receivers offer low complexity for long code lengths, allowing an increase in frequency diversity. We emphasise the benefits of orthogonal codes for correlation detectors because of their effectiveness in reducing the crest factor, as well as providing low complexity receiver solutions.

Keywords

Rayleigh channels; code division multiple access; correlation methods; diversity reception; fading; frequency division multiplexing; land mobile radio; maximum likelihood detection; multimedia communication; radio receivers; trellis codes; MC-CDMA systems; OFDM; Rayleigh fading; code selection; correlation receivers; crest factor reduction; frequency diversity; long code lengths; low complexity receivers; maximum likelihood detection; mobile radio; multicarrier code division multiple access systems; multimedia wireless communications systems; multiple trellis coding; multiuser detection; orthogonal codes; orthogonal frequency division multiplexing; processing gain; short codes; spectral efficiency; spreading code; Fading; Frequency diversity; Interference; Multiaccess communication; Multicarrier code division multiple access; Multimedia systems; OFDM; Radio spectrum management; Rayleigh channels; Wireless communication;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Applications Digest, 1997., IEEE MTT-S Symposium on Technologies for

Conference_Location

Vancouver, BC, Canada

Print_ISBN

0-7803-3318-7

Type

conf

DOI

10.1109/MTTTWA.1997.595113

Filename

595113