Symbol Cyclic-Shift Equalization Algorithm-A CP-Free OFDM/OFDMA System Design

The use of cyclic prefix (CP) allows all existing orthogonal frequency-division multiplexing or multiple access (OFDM/OFDMA) systems to realize high-data-rate transmission in frequency-selective fading channels at the expense of losses in spectrum efficiency, energy efficiency, and transmission rate...

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Published inIEEE transactions on vehicular technology Vol. 66; no. 1; pp. 282 - 294
Main Authors Liu, Xiqing, Chen, Hsiao-Hwa, Chen, Shuyi, Meng, Weixiao
Format Journal Article
LanguageEnglish
Published IEEE 01.01.2017
Subjects
Cyclic prefix (CP)
Decision feedback equalizers
decision-feedback equalization (DFE)
Delays
frequency-selective fading
Interference
OFDM
orthogonal frequency-division multiple access (OFDMA)
orthogonal frequency-division multiplexing (OFDM)
Propagation losses
Radio transmitters
Receivers
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Abstract The use of cyclic prefix (CP) allows all existing orthogonal frequency-division multiplexing or multiple access (OFDM/OFDMA) systems to realize high-data-rate transmission in frequency-selective fading channels at the expense of losses in spectrum efficiency, energy efficiency, and transmission rate (SET). This paper proposes a CP-free OFDM/OFDMA design. Unlike traditional OFDM/OFDMA systems, the proposed CP-free OFDM/OFDMA does not insert CPs between symbols at the transmitter side. The neighboring symbols in frequency-selective fading channels will be overlapped at a receiver, and decision feedback equalization (DFE) is performed before FFT operation for intersymbol interference (ISI) removal. After DFE, each symbol consists of multipath returns with different linear shifts (LSs), which may result in intercarrier interference (ICI). Therefore, the output symbols from the DFE will be sent to a CP restoration unit for LS-to-cyclic-shift (CS) conversion. We call this a CP-free OFDM/OFDMA system symbol CS equalizing OFDM/OFDMA (SCSE-OFDM/OFDMA), whose system design is introduced in detail in this paper. We will show that SCSE-OFDM/OFDMA offers a much higher SET than traditional OFDM/OFDMA systems in frequency-selective fading channels.
AbstractList The use of cyclic prefix (CP) allows all existing orthogonal frequency-division multiplexing or multiple access (OFDM/OFDMA) systems to realize high-data-rate transmission in frequency-selective fading channels at the expense of losses in spectrum efficiency, energy efficiency, and transmission rate (SET). This paper proposes a CP-free OFDM/OFDMA design. Unlike traditional OFDM/OFDMA systems, the proposed CP-free OFDM/OFDMA does not insert CPs between symbols at the transmitter side. The neighboring symbols in frequency-selective fading channels will be overlapped at a receiver, and decision feedback equalization (DFE) is performed before FFT operation for intersymbol interference (ISI) removal. After DFE, each symbol consists of multipath returns with different linear shifts (LSs), which may result in intercarrier interference (ICI). Therefore, the output symbols from the DFE will be sent to a CP restoration unit for LS-to-cyclic-shift (CS) conversion. We call this a CP-free OFDM/OFDMA system symbol CS equalizing OFDM/OFDMA (SCSE-OFDM/OFDMA), whose system design is introduced in detail in this paper. We will show that SCSE-OFDM/OFDMA offers a much higher SET than traditional OFDM/OFDMA systems in frequency-selective fading channels.
Author Weixiao Meng
Xiqing Liu
Shuyi Chen
Hsiao-Hwa Chen
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Snippet The use of cyclic prefix (CP) allows all existing orthogonal frequency-division multiplexing or multiple access (OFDM/OFDMA) systems to realize high-data-rate...
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SubjectTerms Cyclic prefix (CP)
Decision feedback equalizers
decision-feedback equalization (DFE)
Delays
frequency-selective fading
Interference
OFDM
orthogonal frequency-division multiple access (OFDMA)
orthogonal frequency-division multiplexing (OFDM)
Propagation losses
Radio transmitters
Receivers
Title Symbol Cyclic-Shift Equalization Algorithm-A CP-Free OFDM/OFDMA System Design
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Volume 66
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