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Proceedings ArticleDOI

The Prefix Design and Performance Analysis of DFT-based Overlapped Frequency Division Multiplexing (OvFDM-DFT) System

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TLDR
Theoretical analysis and simulation results show that zero-padding cyclic-prefix has a much better performance than the conventional cycling-prefix and the implicit frequency diversity ability of the OvFDM-DFT symbols is also verified by the simulations.
Abstract
This paper propose the theoretical analysis of the DFT based overlapped frequency division multiplexing (OvFDM)/non-orthogonal frequency division multiplexing(NOFDM) communication system, and investigates the impact of conventional cyclic-prefix and zero-padding cyclic-prefix respectively for the OvFDM-DFT system in the time-variant frequency-selective fading channels The sub-carriers of the DFT based OvFDM/NOFDM communication system are overlapped together and the bandwidth can be larger than the frequency coherence bandwidth, so a kind of implicit frequency diversity will be exploited by the MLSD receiver, which will improve the system performance Theoretical analysis and simulation results show that zero-padding cyclic-prefix has a much better performance than the conventional cyclic-prefix The implicit frequency diversity ability of the OvFDM-DFT symbols is also verified by the simulations

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Citations
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Journal ArticleDOI

VLSI Architecture for a Reconfigurable Spectrally Efficient FDM Baseband Transmitter

TL;DR: This paper presents two new variants of a digital baseband transmitter architecture for SEFDM, based on a modulation algorithm which employs the discrete Fourier transform (DFT) implemented efficiently using the fast Fouriertransform (FFT).
Proceedings ArticleDOI

A Truncated SVD approach for fixed complexity spectrally efficient FDM receivers

TL;DR: New SEFDM receivers that offer substantial complexity reduction with a competitive Bit Error Rate (BER) performance are presented and the Truncated Singular Value Decomposition (TSVD) is proposed as an efficient tool to overcome the ill conditioning of the system caused by the orthogonality collapse.
Proceedings ArticleDOI

VLSI architecture for a reconfigurable Spectrally Efficient FDM baseband transmitter

TL;DR: This paper presents the first VLSI digital baseband transmitter architecture for SEFDM, implemented using a 65nm CMOS cell library to provide analysis of area and power compared to a baseline OFDM transmitter.
Proceedings ArticleDOI

Robust channel estimation for Spectrally Efficient FDM system

TL;DR: This work proposes a novel channel estimation technique based on transmitting pilot symbols invoking the partial orthogonality structure of the SEFDM system to avoid the ill-conditioning impact and is capable of delivering more accurate estimates.
Proceedings ArticleDOI

Precoded Spectrally Efficient FDM system

TL;DR: In this paper, the authors proposed a precoding strategy that greatly simplifies the detection of the signal and facilitates simpler detection for the same bandwidth savings as an equivalent uncoded SEFDM system, which is based on localizing the effects of the lost orthogonality in a portion of transmitted symbols.
References
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Journal ArticleDOI

Data Transmission by Frequency-Division Multiplexing Using the Discrete Fourier Transform

TL;DR: The Fourier transform data communication system is described and the effects of linear channel distortion are investigated and a differential phase modulation scheme is presented that obviates any equalization.
Journal ArticleDOI

Performance of an Efficient Parallel Data Transmission System

TL;DR: A parallel quadrature AM data transmission system with a number of overlapping channels, each carrying a signaling rateb, spacedb/2apart in frequency appears to be a promising technique for achieving good performance at high information rates over bandlimited dispersive transmission media.
Journal ArticleDOI

Practical blind demodulators for high-order QAM signals

TL;DR: This paper examines the problem of demodulating time dispersed digitally modulated signals with particular emphasis on two aspects: the all-digital implementation of such demodulators and the use of "blind" algorithms for initializing the demodulator in the absence of explicit training by the transmitter.

Delivering On The 256 QAM Promise

TL;DR: It is demonstrated that it is an industry myth to suggest that VOD QAM transmitters need not necessarily comply with the RF specifications of DOCSIS, and compliance with mostDOCSIS downstream RF noise specifications is essential in order to assure the proliferation growth and reliable delivery of any 256 QAM service over multiple channels.

Multiple carriers in wireless communications - curse or blessing?

TL;DR: In this article, the authors illustrate the sensitivity of the most frequently used multi-carrier technique, i.e., ortho gonal frequency division multiplexing (OFDM), to three of the main impairments: phase noise, IQ imbalance and nonlinearities.