Discrete multiple tone modulation with coset coding for the spectrally shaped channel

Ruiz, A.; Cioffi, J.M.; Kasturia, S.

doi:10.1109/26.142792

Cited by 131 publications

(56 citation statements)

References 18 publications

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“…It is known that uncoded OFDM is vulnerable to weak symbol detection when the frequency selective channel has nulls on the DFT grid, and therefore, uncoded OFDM may not capture the full diversity of the inter-symbol interference (ISI) channel [6]. To mitigate this effect, various coded-OFDM schemes have been considered [7,8]. Motivated to achieve full diversity without error-control coding, complex-field coded (CFC)-OFDM has been introduced [6], where it is shown to achieve full diversity with maximum likelihood (ML) detection.…”

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confidence: 99%

Diversity order in ISI channels with single-carrier frequency-domain equalizers

Tajer

Nosratinia

2010

IEEE Trans. Wireless Commun.

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This paper analyzes the diversity gain achieved by single-carrier frequency-domain equalizer (SC-FDE) in frequency selective channels, and uncovers the interplay between diversity gain d, channel memory length ν, transmission block length L, and the spectral efficiency R. We specifically show that for the class of minimum means-square error (MMSE) SC-FDE receivers, for rates R ≤ log L ν full diversity of d = ν + 1 is achievable, while for higher rates the diversity is given by d = ⌊2 −R L⌋ + 1. In other words, the achievable diversity gain depends not only on the channel memory length, but also on the desired spectral efficiency and the transmission block length. A similar analysis reveals that for zero forcing SC-FDE, the diversity order is always one irrespective of channel memory length and spectral efficiency. These results are supported by simulations.

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confidence: 99%

Diversity order in ISI channels with single-carrier frequency-domain equalizers

Tajer

Nosratinia

2010

IEEE Trans. Wireless Commun.

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“…uncoded OFDM systems) do not offer any frequency diversity in rich fading multipath environment due to different frequency responses of channel space branches. In literature, different kinds of coding or precoding based techniques have been proposed to maximize the diversity gain of OFDM signals [20][21][22][23][24][25][26]. Coded-OFDM (COF-DM) schemes employ's the error-control-codes (ECCs) before inverse-fast-fourier transform (IFFT) operation to deal with diversity loss which causes loss in performance.…”

Section: Introductionmentioning

confidence: 99%

A ZCMT Precoding Based Multicarrier OFDM System to Minimize the High PAPR

Baig

Jeoti

2012

Wireless Pers Commun

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This paper presents a Zadoff-Chu matrix transform (ZCMT) precoding based multicarrier orthogonal-frequency-division-multiplexing (OFDM) system to minimize the high peak-to-average power ratio (PAPR). In the proposed system, ZCMT kernel is applied to the constellation symbols which not only reduces PAPR but also improves bit-error-rate (BER) performance. The ZCMT precoded OFDM signals allow the radiofrequency high-power-amplifier (HPA) to operate near its saturation level, thus maximize the power efficiency. Extensive computer simulations have been performed to analyze the PAPR, BER and power-spectral-density (PSD). Simulation results show that the proposed system has excellent PAPR gain and BER performance with no spectral distortion.Keywords Orthogonal-frequency-division-multiplexing (OFDM) system · Zadoff-Chu matrix transform (ZCMT) · Peak-to-average power ratio (PAPR) · Bit-error-rate (BER) · Power-spectral-density (PSD)

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“…An elegant way to remove this constraint is by combining DiscreteMultitone (DMT) transmission ( [7]) with the proposed precoding structure. The idea is to employ DMT, in order to partition the available bandwidth into a large number of orthogonal bands, where precoding can be applied individu-…”

Section: Combining Precoding With Multi-carrier Modulationmentioning

confidence: 99%

A multi-user precoding scheme achieving crosstalk cancellation with application to DSL systems

Ginis

Cioffi²

Conference Record of the Thirty-Fourth Asilomar Conference on Signals, Systems and Computers (Cat. No.00CH37154)

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This paper describes a precoding scheme capable of achieving crosstalk cancellation in scenarios involving communication from a "base station" to a number of geographically dispersed users. We illustrate that joint processing at the "base station '' of the transmitted signals of all users can succeed in removing the otherwise resulting crosstalk. The method employed borrows from the concept of the Tomlinson-Harashima precoder which is ofen used for equalization against intersymbol interference (ISI). One possible application of the proposed technique is in DigitalSubscriber-Line (DSL) system, where Far-End-Crosstalk (FEXT) poses a severe transmission constraint. Simulation results show that signijicant improvements can be realized in such scenarios.

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Discrete multiple tone modulation with coset coding for the spectrally shaped channel

Cited by 131 publications

References 18 publications

Diversity order in ISI channels with single-carrier frequency-domain equalizers

Diversity order in ISI channels with single-carrier frequency-domain equalizers

A ZCMT Precoding Based Multicarrier OFDM System to Minimize the High PAPR

A multi-user precoding scheme achieving crosstalk cancellation with application to DSL systems

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