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Leus, G. (author), Van Walree, P.A. (author)
A multiband OFDM transmitter and receiver are presented for underwater communications at low SNR. Compared with a single-band OFDMscheme, the multiband approach leads to a considerable reduction in the receiver complexity. The proposed system has been tested at sea with 16 subbands covering a total bandwidth of 3.6 kHz, at user data rates of 4.2...
journal article
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Petré, F. (author), Leus, G. (author), Moonen, M. (author), De Man, H. (author)
Effective suppression of multiuser interference (MUI) and mitigation of frequency-selective fading effects within the complexity constraints of the mobile constitute major challenges for broadband cellular downlink transceiver design. Existing wideband direct-sequence (DS) code division multiple access (CDMA) transceivers suppress MUI...
journal article 2004
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Leus, G. (author), Petré, F. (author), Moonen, M. (author)
In the downlink of DS-CDMA, frequency-selectivity destroys the orthogonality of the user signals and introduces multiuser interference (MUI). Space-time chip equalization is an efficient tool to restore the orthogonality of the user signals and suppress the MUI. Furthermore, multiple-input multiple-output (MIMO) communication techniques can...
journal article 2004
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Leus, G. (author), Loubaton, P. (author), Slock, D. (author), Zoltowski, M.D. (author)
journal article 2005
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Djapic, R. (author), Leus, G. (author), Van Der Veen, A.J. (author), Trinda, A. (author)
Ultra-wideband (UWB) wireless communication systems are based on the transmission of extremely narrow pulses, with a duration inferior to a nanosecond. The application of transmit reference (TR) to UWB systems allows to side-step channel estimation at the receiver, with a tradeoff of the effective transmission bandwidth, which is reduced by the...
journal article 2006
document
Leus, G. (author)
journal article 2006
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Rugini, L. (author), Banelli, P. (author), Leus, G. (author)
Recently, several approaches have been proposed for the equalization of orthogonal frequency-division multiplexing (OFDM) signals in challenging high-mobility scenarios. Among them, a minimum mean-squared error (MMSE) block linear equalizer (BLE), based on a band LDL factorization, is particularly attractive for its good tradeoff between...
journal article 2006
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Barhumi, I. (author), Leus, G. (author), Moonen, M. (author)
We propose channel estimation and direct equalization techniques for transmission over doubly selective channels. The doubly selective channel is approximated using the basis expansion model (BEM). Linear and decision feedback equalizers implemented by time-varying finite impulse response (FIR) filters may then be used to equalize the doubly...
journal article 2006
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Dang, Q.H. (author), Trindade, A. (author), van der Veen, A.J. (author), Leus, G. (author)
journal article 2006
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Leus, G. (author), Giannakis, G. (author), Linnartz, J.P. (author), Ma, X. (author), Swami, A. (author), Tepedelenlioglu, C. (author)
journal article 2006
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Rugini, L. (author), Leus, G. (author)
conference paper 2007
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Rousseaux, O. (author), Leus, G. (author), Moonen, M. (author)
To allow for a computationally efficient equalization scheme for the frequency-selective transmission channels encountered in wireless local area network (WLAN) applications, cyclic prefix (CP) block transmission schemes have been proposed, such as single-carrier CP (SC-CP) and multi-carrier CP (MC-CP) transmission, also known as orthogonal...
journal article 2007
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Simon, C. (author), Leus, G. (author)
This paper gives an overview and a comparison of recent feedback quantization schemes for linear precoded spatial multiplexing systems. In addition, feedback compression methods are presented that exploit the time correlation of the channel. These methods can be roughly divided into two classes. The first class tries to minimize the data rate on...
journal article 2008
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Tang, Z. (author), Leus, G. (author)
In this paper, we present a single-carrier transceiver for rapidly time-varying channels, where the equalization step is implemented in the frequency domain. When the channel abides with both fast fading and severe inter-block interference, our equalizer relies on a band approximation of the frequencydomain channel matrix to maintain low...
journal article 2008
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Fang, K. (author), Rugini, L. (author), Leus, G. (author)
We propose low-complexity block turbo equalizers for orthogonal frequency-division multiplexing (OFDM) systems in time-varying channels. The presented work is based on a soft minimum mean-squared error (MMSE) block linear equalizer (BLE) that exploits the banded structure of the frequency-domain channel matrix, as well as a receiver window that...
journal article 2008
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Wang, Y. (author), Leus, G. (author), Van der Veen, A.J. (author)
A complete detection, channel estimation, synchronization, and equalization scheme for a transmitted reference (TR) ultra-wideband (UWB) system is proposed in this paper. The scheme is based on a data model which admits a moderate data rate and takes both the interframe interference (IFI) and the intersymbol interference (ISI) into consideration...
journal article 2009
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Wang, T. (author), Leus, G. (author), Huang, L. (author)
Sensor positioning is an important task of location-aware wireless sensor networks. In most sensor positioning systems, sensors and beacons need to emit ranging signals to each other. Sensor ranging energy should be low to prolong system lifetime, but sufficiently high to fulfill prescribed accuracy requirements. This motivates us to investigate...
journal article 2009
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Fang, K. (author), Rugini, L. (author), Leus, G. (author)
Modern wireless communication systems require high transmission rates, giving rise to frequency selectivity due to multipath propagation. In addition, high-mobility terminals and scatterers induce Doppler shifts that introduce time selectivity. Therefore, advanced techniques are needed to accurately model the time- and frequency-selective (i.e.,...
journal article 2010
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Xin, Y. (author), Wang, X. (author), Leus, G. (author), Yue, G. (author), Jiang, J. (author)
journal article 2011
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Godana, B. (author), Barroso, A. (author), Leus, G.J.T. (author)
Radar is an attractive technology for long term monitoring of human movement as it operates remotely, can be placed behind walls and is able to monitor a large area depending on its operating parameters. A radar signal reflected off a moving person carries rich information on his or her activity pattern in the form of a set of Doppler frequency...
journal article 2011
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