Nonorthogonal pulseshapes for multicarrier communications in doubly dispersive channels

Kozek, W.; Molisch, Andreas F.

doi:10.1109/49.730463

Cited by 329 publications

(304 citation statements)

References 22 publications

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“…Most classical MCM systems can be classified as Gaborbased MCM schemes. This includes notably: OFDM (orthogonal frequency division multiplexing), FBMC (filter bank based multi-carrier) [14], FMT (filtered multitone) [15], NOFDM (non-orthogonal frequency division multiplexing) [16], GFDM (generalized frequency division multiplexing) [17], and UFMC (universal filtered multi-carrier) [18].…”

Section: A Gabor-based MCM Schemesmentioning

confidence: 99%

Adaptive Wavelet Packet Modulation

Chafii¹,

Palicot²,

Gribonval³

et al. 2018

IEEE Trans. Commun.

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Abstract-In this paper, we propose a new adaptive modulation based on the wavelet packet transform, which targets a good resistance against frequency selective channels while avoiding a large PAPR. Classical multi-carrier modulation schemes divide the channel bandwidth into narrowband sub-channels to improve its robustness against frequency selective fading. However, they suffer from the peak-to-average power ratio (PAPR) problem which occurs due to a random constructive addition of subcarriers. By contrast, single carrier modulation schemes, where each transmitted symbol fully occupies the bandwidth, are more sensitive to frequency selective environments and less affected by the PAPR problem. In this work, we show how the bandwidth division can be reconfigurable and adapted to the channel properties, and we provide several examples to prove that the proposed adaptive modulation represents an alternative modulation which is adjustable between two extreme cases: single carrier modulation and classical multi-carrier modulation. Index Terms-Multi-Carrier Modulation (MCM), Wavelet transform, Orthogonal Frequency Division Multiplexing (OFDM), Peak-to-Average Power Ratio (PAPR).

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Section: A Gabor-based MCM Schemesmentioning

confidence: 99%

Adaptive Wavelet Packet Modulation

Chafii¹,

Palicot²,

Gribonval³

et al. 2018

IEEE Trans. Commun.

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“…At the transmitter, a bit stream is coded and mapped to transmit symbols ( is the OFDM symbol index and is the subcarrier index). The discrete-time baseband transmit signal is given by [5]- [8] (1a)…”

Section: Ofdm System Modelmentioning

confidence: 99%

“…Conventional OFDM systems use rectangular transmit and receive pulses and a cyclic prefix. Generalized pulse-shaping OFDM systems have been proposed in [1] and [5]- [8].…”

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confidence: 99%

MMSE and adaptive prediction of time-varying channels for OFDM systems

Schafhuber

Matz

2005

IEEE Trans. Wireless Commun.

148

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Abstract-We propose decision-directed channel predictors for orthogonal frequency-division multiplexing (OFDM) communications over time-varying channels. Channel prediction is capable of yielding up-to-date channel state information even without regular transmission of pilot symbols. It is thus potentially useful for delay-free equalization, antenna combining, space-time decoding, adaptive modulation, adaptive power control, and adaptive transmit antenna diversity. We derive a minimum mean-square error channel predictor and its efficient discrete Fourier transform implementation. Furthermore, we develop adaptive predictors that do not require any statistical prior knowledge and are able to track nonstationary channel and noise statistics. Simulation results involving an OFDM receiver in which channel prediction is used for delay-free equalization demonstrate the excellent performance of the proposed techniques even for fast time-varying channels.

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“…This leads us to study the case where the channel changes continuously within one block time. Windowed Fourier functions in L 2 (R 2 ) [12] have been reported in [10], [11], serving as good approximate eigenfunctions of practical LTV channels. They are in the form of f (n − lN ) exp(j2πkn/M ).…”

Section: Introductionmentioning

confidence: 99%

Optimized DFT-FB transceivers over LTV channels

Liu

Vaidyanathan

2009

2009 Conference Record of the Forty-Third Asilomar Conference on Signals, Systems and Computers

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Abstract-In this work, we consider the optimization of DFT modulated lterbank transceiver (DFT-FBT) over linear time varying (LTV) channels. The DFT-FBT is a generalization of the Af ne Fourier transform based OFDM (Af ne OFDM) and the chirped OFDM, which are suggested in recent literature for the transmission over LTV channels. For both known LTV channels and unknown wide sense stationary uncorrelated scattering (WSSUS) statistical channels, we show how to optimize the transmitting and receiving prototypes of DFT-FBT such that the signal to interference and noise ratio (SINR) at the receiver is maximized. After the optimization, the channel dependent part, like OFDM, is a set of scalar multipliers at the receiver end that adapts to the equivalent memoryless channel on a block basis. Simulation results show that the bit error rate (BER) performance of the optimized DFT-FBT over LTV channels is superior to the Af ne OFDM.

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Nonorthogonal pulseshapes for multicarrier communications in doubly dispersive channels

Cited by 329 publications

References 22 publications

Adaptive Wavelet Packet Modulation

Adaptive Wavelet Packet Modulation

MMSE and adaptive prediction of time-varying channels for OFDM systems

Optimized DFT-FB transceivers over LTV channels

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