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

TitleCode selection for low complexity receivers in multi-carrier code division multiple access systems
Publication TypeConference Paper
Year of Publication1997
AuthorsFreiberg, L., and V. K. Bhargava
Conference NameWireless Applications Digest, 1997., IEEE MTT-S Symposium on Technologies for
Pagination65 -68
Date Publishedfeb.
Keywordscode division multiple access, code selection, correlation methods, correlation receivers, crest factor reduction, diversity reception, fading, frequency diversity, frequency division multiplexing, land mobile radio, long code lengths, low complexity receivers, maximum likelihood detection, MC-CDMA systems, mobile radio, multicarrier code division multiple access systems, multimedia communication, multimedia wireless communications systems, multiple trellis coding, multiuser detection, OFDM, orthogonal codes, orthogonal frequency division multiplexing, processing gain, radio receivers, Rayleigh channels, Rayleigh fading, short codes, spectral efficiency, spreading code, trellis codes

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


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