Results 1 - 10 of 145

1 Parameter Free Iterative Decoding Metrics for Non-Coherent Orthogonal Modulation

by Albert Guillén I Fàbregas, Alex Grant
"... We study decoder metrics suited for iterative decoding of non-coherently detected bit-interleaved coded orthogonal modulation. We propose metrics that do not require the knowledge of the signalto-noise ratio, and yet still offer very good performance. I. INTRODUCTION AND SYSTEM MODEL Orthogonal modu ..."
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modulation with non-coherent (NC) detection is a practical choice for situations where the received signal phase cannot be reliably estimated and/or tracked. Examples include military communications using fast frequency hopping, airborne communications with high Doppler shifts due to significant relative

Successive-relaying-aided decode-and-forward coherent versus noncoherent cooperative multicarrier space-time shift keying

by Mohammad Ismat Kadir, Li Li, Sheng Chen, Lajos Hanzo - IEEE Trans. Veh. Technol
"... Abstract—Successive-relaying-aided (SR) cooperative multicarrier (MC) space–time shift keying (STSK) is proposed for frequency-selective channels. We invoke SR to mitigate the typical 50 % throughput loss of conventional half-duplex relaying schemes and MC code-division multiple access (MC-CDMA) to ..."
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transmitting to the destination node (DN). The constituent relay nodes (RNs) of each VAA activate cyclic-redundancy-checking-based (CRC) selective decode-and-forward (DF) relaying. The DN can jointly detect the signals received via the SN-to-DN and VAA-to-DN links using a low-complexity single

Optimal Non-Coherent M-ARY Energy Shift Keying for Cooperative Transmission in Sensor Networks

by Albert Krohn, Universität Karlsruhe - Proc. IEEE 31st Int’l Conf. Acoustics, Speech, and Signal Processing (ICASSP ’06 , 2006
"... Cooperative transmission follows the idea to achieve better reception quality for wireless communication systems by exploiting spatial diversity. We discuss the case where a group of sensor nodes transmit cooperatively and simultaneously identical symbols to a far destination. Doing so, they achieve ..."
Abstract - Cited by 11 (5 self) - Add to MetaCart
the symbol error. For this, we assume neither phase nor carrier synchronization between cooperatively transmitting nodes or the receiver yielding an easy to implement system with very low requirements for the participating wireless sensor nodes. Transmitted signals superimpose non-coherently in the receiver

QRC-ESPRIT Method for Wideband Signals

by Nizar Tayem, Prince Mohammad
"... Abstract – In this paper, a new algorithm for a high resolution proposed for non-coherent signals requires less Direction Of Arrival (DOA) estimation method for multiple computational load. A class of representative high-resolution wideband signals is proposed. The proposed method proceeds DOA estim ..."
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Abstract – In this paper, a new algorithm for a high resolution proposed for non-coherent signals requires less Direction Of Arrival (DOA) estimation method for multiple computational load. A class of representative high-resolution wideband signals is proposed. The proposed method proceeds DOA

Universal Space-Time Coding

by Hesham El Gamal, Mohamed Oussama Damen - IEEE Trans. Inform. Theory , 2003
"... A universal framework is developed for constructing full-rate and full-diversity coherent space--time codes for systems with arbitrary numbers of transmit and receive antennas. The proposed framework combines space--time layering concepts with algebraic component codes optimized for single-input--si ..."
Abstract - Cited by 143 (7 self) - Add to MetaCart
-likelihood (ML) decoding using algorithms from lattice theory. Combining the design framework with the Cayley transform allows to construct full diversity differential and noncoherent space--time codes. The proposed framework subsumes many of the existing codes in the literature, extends naturally to time

BINAURAL WIDEBAND TELEPHONY USING STEGANOGRAPHY

by Bernd Geiser, Peter Vary
"... Abstract: A system for the transmission of binaural wideband speech signals over a standard telephone network is proposed. It is backwards compatible with the (single channel and narrowband) 3GPP Adaptive Multirate (AMR) codec. The required information about the source location and for audio bandwid ..."
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bandwidth extension is transmitted over a steganographic communication channel that is embedded within the bitstream of the AMR codec. A legacy receiver can still decode the single channel narrowband signal without noticeable quality loss. 1

INCOHERENT WIDEBAND COMMUNICATIONS OVER MULTIPATH CHANNELS

by Elchanan Zwecher, Dana Porrat
"... This paper analyzes the efficiency of spreading modulations over wideband multipath channels. We bring asymptotic wideband results, and focus on the low SNR regime. In coherent systems low SNR implies efficient communications, but in a non-coherent communications the SNR should be high enough in ord ..."
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This paper analyzes the efficiency of spreading modulations over wideband multipath channels. We bring asymptotic wideband results, and focus on the low SNR regime. In coherent systems low SNR implies efficient communications, but in a non-coherent communications the SNR should be high enough

Development of an Ultra-Wideband (UWL) Receiver System at Parkes

by The Parkes, Pulsar Timing, Array Team, Ettore Carretti, Ray Norris, Chris Phillips , 2013
"... • Installation of a wideband “UWL ” receiver covering the band 0.7 GHz to 4.0 GHz on the Parkes 64-m telescope, together with the 20cm Multibeam receiver, would allow more than 90 % of current Parkes observations to be made with no receiver changes, greatly improving the efficiency of Parkes operati ..."
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• Installation of a wideband “UWL ” receiver covering the band 0.7 GHz to 4.0 GHz on the Parkes 64-m telescope, together with the 20cm Multibeam receiver, would allow more than 90 % of current Parkes observations to be made with no receiver changes, greatly improving the efficiency of Parkes

Iterative Synchronization of Multiuser Ultra-Wideband Signals

by Ersen Ekrem, Mutlu Koca, Hakan Deliç, Senior Member
"... Abstract—In this paper, two novel iterative chip-level synchronization methods, one blind and the other data-aided, are proposed for chip-interleaved time-hopping (TH) ultra-wideband signals that are subject to intersymbol interference (ISI) and multiple access interference (MAI). Both algorithms ar ..."
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simple, here it is redesigned to incorporate the soft information. The resulting receivers perform as well as iterative equalization with perfect timing information, and catch the single-user performance at moderate signal-tonoise ratios. Index Terms—Synchronization, ultra-wideband, chip

Capacity of Sparse Multipath Channels in the Ultra-Wideband Regime

by Vasanthan Raghavan, Gautham Hariharan, Akbar M. Sayeed , 2007
"... This paper studies the ergodic capacity of time- and frequency-selective multipath fading channels in the ultrawideband (UWB) regime when training signals are used for channel estimation at the receiver. Motivated by recent measurement results on UWB channels, we propose a model for sparse multipa ..."
Abstract - Cited by 12 (3 self) - Add to MetaCart
efficiency in the wideband/low-SNR limit introduced by Verdu: first- and second-order optimality conditions. Recent results by Zheng et. al. have underscored the large gap in spectral efficiency between coherent and non-coherent extremes and the importance of channel learning in bridging the gap. Building
Results 1 - 10 of 145