DocumentCode :
1713026
Title :
Blind channel estimation based on Second Order Statistics for IFDMA
Author :
Sohl, Anja ; Klein, Anja
Author_Institution :
Commun. Eng. Lab., Tech. Univ. Darmstadt, Darmstadt
fYear :
2008
Firstpage :
1
Lastpage :
5
Abstract :
In this paper, the interleaved frequency division multiple access (IFDMA) scheme is considered as a special case of Discrete Fourier Transform (DFT)-precoded Orthogonal Frequency Division Multiple Access (OFDMA) with interleaved subcarrier allocation. The redundancy that is characteristic for an IFDMA-signal is exploited in order to estimate the channel without pilot symbols and, thus, overcome the drawback of increased pilot symbol overhead that arises for IFDMA-systems. Two well-known blind channel estimation algorithms based on Second Order Statistics (SOS) are adapted to the application in an IFDMA-system and compared in terms of performance and convergence. Further on, the influence of multi-user transmission is illustrated for the two proposed blind channel estimation algorithms and the differences between multi-user uplink and downlink transmission in terms of channel estimation performance are investigated and emphasized by numerical results.
Keywords :
OFDM modulation; channel estimation; discrete Fourier transforms; frequency division multiple access; statistical analysis; IFDMA; OFDMA; blind channel estimation; discrete Fourier transform; interleaved frequency division multiple access scheme; interleaved subcarrier allocation; multi-user transmission; pilot symbol overhead; precoded orthogonal frequency division multiple access; second order statistics; Blind equalizers; Channel estimation; Convergence; Discrete Fourier transforms; Downlink; Frequency conversion; Interpolation; Peak to average power ratio; Signal generators; Statistics;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2008. PIMRC 2008. IEEE 19th International Symposium on
Conference_Location :
Cannes
Print_ISBN :
978-1-4244-2643-0
Electronic_ISBN :
978-1-4244-2644-7
Type :
conf
DOI :
10.1109/PIMRC.2008.4699709
Filename :
4699709
Link To Document :
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