Title :
Selection of the spreading parameters for the downlink of coded OFDM-CDMA systems
Author :
Kténas, D. ; des Noes, Mathieu
Author_Institution :
CEA-LETI, Grenoble
Abstract :
This article presents a new method for the selection of the spreading parameters for the downlink of two dimensional (2D) OFDM-CDMA systems in the presence of channel coding. This new approach allows the determination of the spreading factor values in time (ST) and in frequency (SF) directions in order to find the most reliable 2D transmission scheme. The method is based on the exponential effective SNR mapping (EESM) technique applied to the asymptotic signal to interference plus noise ratio (SINR) computed at the output of the equalizer. Thanks to this asymptotic compressed SINR, we are also able to assess the performances of 2D OFDM-CDMA systems in terms of BER (bit error ratio) at the output of the channel decoder
Keywords :
OFDM modulation; channel coding; code division multiple access; decoding; equalisers; error statistics; spread spectrum communication; telecommunication network reliability; BER; EESM; OFDM-CDMA systems; bit error ratio; channel coding; code division multiple access; decoder; downlink; equalizer; exponential effective SNR mapping technique; orthogonal frequency division multiplexing; reliable 2D transmission scheme; spreading parameters; Channel coding; Coherence; Computational modeling; Decoding; Diversity reception; Downlink; Equalizers; Multiple access interference; OFDM; Signal to noise ratio;
Conference_Titel :
Spread Spectrum Techniques and Applications, 2006 IEEE Ninth International Symposium on
Conference_Location :
Manaus-Amazon
Print_ISBN :
0-7803-9779-7
Electronic_ISBN :
0-7803-9780-0
DOI :
10.1109/ISSSTA.2006.311741
