Spread OFDM performance with MMSE equalization

Author

Debbah, Mérouane ; Loubton, P. ; De Courville, Marc

Author_Institution

Motorola Labs-Paris, Espace Technologique Saint-Aubin, Gif-sur-Yvette, France

Volume

4

fYear

2001

fDate

2001

Firstpage

2385

Abstract

Upper-bounds on the bit error probability of an OFDM/CDMA system in a single user context are derived for a linear minimum mean-square-error (MMSE) receiver structure. All the calculus are performed in presence of a frequency-selective Rayleigh fading channel both in a coded (convolutive forward error correcting scheme) and uncoded scenario. Surprisingly, we show that coded SOFDM outperforms COFDM if the signal to noise ratio is greater than a given threshold which only depends on the code rate and not on the code structure. These theoretical results provide tools to optimally combine coding and spreading for increasing the spectral efficiency of OFDM/CDMA schemes

Keywords

OFDM modulation; Rayleigh channels; code division multiple access; convolutional codes; equalisers; error statistics; forward error correction; least mean squares methods; modulation coding; multiuser channels; noise; radio receivers; spread spectrum communication; COFDM; MMSE equalization; MMSE receiver structure; OFDM/CDMA system; SNR; bit error probability; code rate; coded SOFDM; convolutive forward error correction; frequency-selective Rayleigh fading channel; linear minimum mean-square-error; signal to noise ratio; spectral efficiency; spread OFDM performance; upper bounds; Attenuation; Calculus; Context; Error probability; Fading; Frequency domain analysis; Interference; OFDM; Signal to noise ratio; Upper bound;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 2001. Proceedings. (ICASSP '01). 2001 IEEE International Conference on

Conference_Location

Salt Lake City, UT

ISSN

1520-6149

Print_ISBN

0-7803-7041-4

Type

conf

DOI

10.1109/ICASSP.2001.940480

Filename

940480