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Investigation on Frequency Diversity Effects of Various Transmission Schemes Using Frequency Domain Equalizer for DFTPrecoded OFDMA
Lianjun DENG Teruo KAWAMURA Hidekazu TAOKA Mamoru SAWAHASHI
Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Vol.E97A
No.1
pp.3039 Publication Date: 2014/01/01
Online ISSN: 17451337
DOI: 10.1587/transfun.E97.A.30
Print ISSN: 09168508 Type of Manuscript: Special Section PAPER (Special Section on Wideband Systems) Category: Foundations Keyword: singlecarrier FDMA, frequency diversity, frequency domain equalizer, frequency mean square covariance, DFTprecoded OFDMA,
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Summary:
This paper presents frequency diversity effects of localized transmission, clustered transmission, and intrasubframe frequency hopping (FH) using a frequency domain equalizer (FDE) for discrete Fourier transform (DFT)precoded Orthogonal Frequency Division Multiple Access (OFDMA). In the evaluations, we employ the normalized frequency mean square covariance (NFMSV) as a measure of the frequency diversity effect, i.e., randomization level of the frequency domain interleaving associated with turbo coding. Linklevel computer simulation results show that frequency diversity is very effective in decreasing the required average received signaltonoise power ratio (SNR) at the target average block error rate (BLER) using a linear minimum meansquare error (LMMSE) based FDE according to the increase in the entire transmission bandwidth for DFTprecoded OFDMA. Moreover, we show that the NFMSV is an accurate measure of the frequency diversity effect for the 3 transmission schemes for DFTprecoded OFDMA. We also clarify the frequency diversity effects of the 3 transmission schemes from the viewpoint of the required average received SNR satisfying the target average BLER for the various key radio parameters for DFTprecoded OFDMA in frequencyselective Rayleigh fading channels.

