Iterative detection algorithms for extended MC-CDMA

Author

Teich, W.G. ; Bury, A. ; Egle, J. ; Nold, M. ; Lindner, J.

Author_Institution

Ulm Univ., Germany

Volume

1

fYear

1998

fDate

2-4 Sep 1998

Firstpage

184

Abstract

Multicarrier code division multiple access (MC-CDMA) combines the advantages of CDMA and orthogonal frequency division multiplexing techniques. For time-varying channels, it can be further improved by introducing an additional spreading in the time direction (extended MC-CDMA). Two low complexity iterative detection algorithms with soft feedback are described: the iterative soft block decision feedback equalizer and a recurrent neural network based detector. Performance results are given for a typical mobile radio channel and compared to the optimum maximum likelihood detector. Introducing pilot symbol assisted channel estimation, the optimum number of pilot symbols is determined and the bit error rate performance is compared to the case of ideal channel estimation

Keywords

OFDM modulation; code division multiple access; computational complexity; decision feedback equalisers; error statistics; iterative methods; land mobile radio; radio receivers; recurrent neural nets; signal detection; time-varying channels; CDMA; MC-CDMA; bit error rate performance; extended MC-CDMA; ideal channel estimation; iterative detection algorithms; iterative soft block decision feedback equalizer; low complexity iterative detection algorithms; mobile radio channel; multicarrier code division multiple access; optimum maximum likelihood detector; orthogonal frequency division multiplexing; pilot symbol assisted channel estimation; recurrent neural network based detector; soft feedback; spreading; time-varying channels; Channel estimation; Decision feedback equalizers; Detection algorithms; Detectors; Maximum likelihood detection; Multiaccess communication; Multicarrier code division multiple access; Neurofeedback; OFDM; Time-varying channels;

fLanguage

English

Publisher

ieee

Conference_Titel

Spread Spectrum Techniques and Applications, 1998. Proceedings., 1998 IEEE 5th International Symposium on

Conference_Location

Sun City

Print_ISBN

0-7803-4281-X

Type

conf

DOI

10.1109/ISSSTA.1998.726223

Filename

726223