Improving the range of ultrawideband transmission using RAKE receivers

Gaur, Sudhanshu; Annamalai, A.

doi:10.1109/vetecf.2003.1285087

Cited by 16 publications

(11 citation statements)

References 7 publications

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Section: Introductionmentioning

confidence: 99%

“…However there had been numerous publications analyzing a reasonably big read range of a chipless tag [7]- [9]. In [7] the range of the ultra-wideband transmission system has been improved using rake receiver where the round trip distance is found to be less than 100m . In [8] a general model for UWB channels has been presented that is valid for the high-frequency range (3-10 GHz) in a number of different environments as well as for the frequency.…”

Section: Introductionmentioning

confidence: 99%

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Improvement of the detection range of a chipless RFID for UWB system using receiver diversity with maximal ratio combining

Mahmud

Majumder

2014

8th International Conference on Electrical and Computer Engineering

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A novel technique for increasing the detection range of a fully passive multiresonator based chipless RFID tag has been proposed using the diversity technique at the reader receiver. Analysis is carried out to find the signal to noise ratio at the output of the diversity receiver using maximal ratio combining (MRC) technique. Bit error rate (BER) is analyzed for Rayleigh fading over the channel. The analyzed approach gives a clear insight regarding the interrelationship between BER, detection ranges and reader received power with the application of receiver diversity and has given improved performance in detecting tag at a comparatively longer distance in different non line of sight (NLOS) environment.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improvement of the detection range of a chipless RFID for UWB system using receiver diversity with maximal ratio combining

Mahmud

Majumder

2014

8th International Conference on Electrical and Computer Engineering

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“…Energy capture in the presence of multipath propagation is conventionally done by RAKE receivers [3], [4]. However, in a pulse-based UWB system, the number of resolvable paths could reach tens to over a hundred in typical indoor propagation environments [5], which imposes technical hurdles as well as implementation difficulties.…”

Section: Introductionmentioning

confidence: 99%

Decision directed autocorrelation receivers for pulsed ultra-wideband systems

Zhao

Liu

Tian

2006

IEEE Trans. Wireless Commun.

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Abstract-The need for effective capture of multipath energy presents a key challenge to receiver design for pulsed ultrawideband (UWB) systems operating in non-line-of-sight propagation environments. Conventional RAKE receivers can capture only a fraction of the received signal energy under practical implementation constraints, and have to deal with stringent synchronization and channel estimation requirements. Transmitreference and autocorrelation receivers can effectively collect energy from all the received multipath components without explicit channel estimation, but the detection performance is limited by noise enhancement effects and the data rate drops by 50% because of pilot symbol overhead. In this paper, we develop decision-directed autocorrelation (DDA) receivers for effective multipath energy capture at low complexity. Operating in an adaptive decision-directed mode, the proposed DDA methods can considerably lower the noise level in the self-derived template waveform, thus improving overall detection performance. There is little loss in energy efficiency since no reference pilots are required during adaptation. Analytical performance analysis along with corroborating simulations is performed to evaluate the error performance of the proposed receivers in indoor lognormal fading channels.

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“…A common approach to energy capture † A. F. Molisch is also at the Department of Electroscience, Lund University, Sweden in the presence of multipath propagation is to implement a RAKE receiver [5], [6], [7]. However, in a pulse-based UWB system, the number of resolvable paths could reach tens to over a hundred in typical indoor propagation environments [8], [9], [10], which imposes technical hurdles as well as implementation difficulties.…”

Section: Introductionmentioning

confidence: 99%

A Hybrid UWB Modulation Design Compatible for both Coherent and Transmit-Reference Receivers

Orlik

Zhao

Molisch

2006

2006 IEEE International Conference on Communications

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In a pulsed UWB system, either coherent receivers or transmit-reference (TR) receivers can be used to demodulate the signals. For coherent receivers, which are typically based on a Rake Structure, the large number of resolvable multipaths is a major challenge for channel estimation and receiver complexity. TR receivers can effectively collect energy from all the received multipath components with much smaller complexity, but show reduced performance. Current modulation formats are tuned to either coherent or TR receivers, but cannot interoperate with both of them. In this paper, we propose an innovative modulation scheme that enables the useage of TR and coherent recievers in the same wireless network. The modulation allows demodulation by TR receivers, while at the same time enabling a coherent receiver to fully exploit all available signal energy, and actually to perform slightly better (by 1.8 dB) than a coherent receiver working with conventional BPSK modulation; this additional gain can be interpreted as a coding gain of a trellis-coded modulation scheme. The scheme thus allows the network designers to trade off performance vs. complexity in the receivers, while allowing a uniform signaling (modulation) scheme for all transmitters. ICC 2006This work may not be copied or reproduced in whole or in part for any commercial purpose. Permission to copy in whole or in part without payment of fee is granted for nonprofit educational and research purposes provided that all such whole or partial copies include the following: a notice that such copying is by permission of Mitsubishi Electric Research Laboratories, Inc.; an acknowledgment of the authors and individual contributions to the work; and all applicable portions of the copyright notice. Copying, reproduction, or republishing for any other purpose shall require a license with payment of fee to Mitsubishi Electric Research Laboratories, Inc. All rights reserved. Abstract-In a pulsed UWB system, either coherent receivers or transmit-reference (TR) receivers can be used to demodulate the signals. For coherent receivers, which are typically based on a Rake structure, the large number of resolvable multipaths is a major challenge for channel estimation and receiver complexity. TR receivers can effectively collect energy from all the received multipath components with much smaller complexity, but show reduced performance. Current modulation formats are tuned to either coherent or TR receivers, but cannot interoperate with both of them at the maximum performance possible for each of them. In this paper, we propose an innovative modulation scheme that enables the use of TR and coherent receivers in the same wireless network. The modulation allows demodulation by TR receivers, while at the same time enabling a coherent receiver to fully exploit all available signal energy, and actually to perform slightly better (by 1.8 dB) than a coherent receiver working with conventional BPSK modulation; this additional gain can be interpreted as a coding gain of a trellis-c...

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Improving the range of ultrawideband transmission using RAKE receivers

Cited by 16 publications

References 7 publications

Improvement of the detection range of a chipless RFID for UWB system using receiver diversity with maximal ratio combining

Improvement of the detection range of a chipless RFID for UWB system using receiver diversity with maximal ratio combining

Decision directed autocorrelation receivers for pulsed ultra-wideband systems

A Hybrid UWB Modulation Design Compatible for both Coherent and Transmit-Reference Receivers

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