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检索条件"主题词=Modulation Coding"

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Weighting Adjustmet Acquisition Method for the DSSS Signal

Weighting Adjustmet Acquisition Method for the DSSS Signal

引用

International Conference on Networks Security, Wireless Communications and Trusted Computing, NSWCTC

作者： Da Teng Zheng Yao Xiaowei Cui Mingquan Lu Zhenming Feng Department of Electronic Engineering Tsinghua University Beijing China

ISBN: (纸本)9781424465972;9780769540115

Acquisition is one of the essential stages in the DSSS signal processing. The conventional acquisition methods may degrade when there is a code phase offset which in the worst case may be a quarter of one chip in this stage. A new acquisition method by using weighting adjustment is proposed to solve this problem. In this paper, we take GPS C/A code as an example to introduce this method. The performance of this method is tested and compared with one conventional method. The simulation results show that the new method has an advantage when there is a large code phase offset.

关键词： Spread spectrum communication Global Positioning System Correlators Signal processing modulation coding Signal processing algorithms Frequency Multiaccess communication Satellite navigation systems Adaptive signal processing

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Common Information Multicast with Different Data Rates

Common Information Multicast with Different Data Rates

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Yuli Yang Sonia Aissa Physical Sciences and Engineering Division King Abdullah University for Science and Technology Thuwal Saudi Arabia INRS-EMT University of Quebec Montreal QUE Canada

The task of multicast is to deliver common information to all users in a group. However, these users' different channel qualities result in their decoding capabilities being different. Therefore, the multicast design faces a dilemma to convey common information in terms of different decoding capabilities. Motivated by this, a multicast transmission scheme is proposed in this paper. In the proposed scheme, the base station transmitter prescribes the modulation and coding scheme to be used, considering the difference between the better channel-case and worse channel-case users' decoding capabilities, and the adaptive hierarchical modulation promises that each users can process the received signals according to his own decoding capabilities. Compared to the traditional multicast transmission with fixed data rate, the numerical results prove the efficiency of the proposed scheme in exploiting the users' decoding capabilities.

关键词： Decoding Channel coding modulation coding Performance analysis Bit error rate Base stations Algorithm design and analysis Information analysis Demodulation Data engineering

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coding for the MIMO multi-hop amplify-and-forward fading channel

Coding for the MIMO multi-hop amplify-and-forward fading cha...

引用

International Conference on Telecommunications (ICT)

作者： Ghassan M. Kraidy Nicolas Gresset Department of Electronics and Telecommunications Norwegian University of Science and Technology Trondheim Norway Research and Development Centre Europe Mitsubishi-Electric Rennes France

In this paper, we study coding techniques for the multiple-input multiple-output multi-hop amplify-and-forward (MIMO-MH-AF) block-fading channel. We first derive conditions on coding rates and space-time precoders that allow a coded modulation to achieve the diversity order provided by the channel. We then derive a bound on the diversity order of a coded modulation so as to attain maximum diversity through parallel partitioning of the channel. Finally, word error rate performances are compared to outage probabilities.

关键词： MIMO Fading Relays modulation coding Protocols Spread spectrum communication Transmitting antennas Error analysis Decoding Space technology

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Random modulation privacy for RFID channels

Random modulation privacy for RFID channels

引用

IEEE International Conference on RFID-Technology and Applications (RFID-TA)

作者： Bruno B. Albert F. M. de Assis Smail Tedjini Department of Electrical Engineering Universidade Federal de Campina Grande Campina Grande Brazil ESISAR Grenoble-INP Valence France

ISBN: (纸本)9781424466979;9781424467006

These instructions give you guidelines for preparing papers for IEEE conferences. Use this document as a template if you are using Microsoft Word 6.0 or later. Otherwise, use this document as an instruction set. Instructions about final paper and figure submissions in this document are for IEEE journals; please use this document as a "template" to prepare your manuscript. For submission guidelines, follow instructions on paper submission system as well as the Conference website. Do not delete the blank line immediately above the abstract; it sets the footnote at the bottom of this column.

关键词： Radiofrequency identification Cryptography Communication system security Guidelines RFID tags Data privacy modulation coding Authorization Automatic control Proposals

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Cooperative relaying in car-to-car communications: Initial results from an experimental study

Cooperative relaying in car-to-car communications: Initial r...

引用

International Symposium on Communications Control and Signal Processing (ISCCSP)

作者： Günther Brandner Udo Schilcher Christian Bettstetter Mobile Systems Group Institute of Networked and Embedded Systems University of Klagenfurt Austria

This paper reports on an experimental study about some benefits of cooperative relays in mobile wireless communications. A basic technique for cooperative relaying is implemented in the programmable hardware platform WARP. Using this implementation, measurements are made for mobile car-to-car communications in a suburban environment. Each of three cars is equipped with a transceiver and serves as sender, relay, or destination, respectively. Results demonstrate that cooperative relaying communications exhibit performance gains over conventional direct communications and time-diversity communications in terms of packet delivery rate, bit error rate, and packet error rate. We account for energy fairness by using half transmission power for cooperative relaying and time diversity communications.

关键词： Relays Mobile communication Hardware Gain measurement Performance gain Field programmable gate arrays modulation coding Diversity reception Analytical models Process control

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Asymptotic BER bounds of BICM-ID based cooperative network over Nakagami-m fading channels

Asymptotic BER bounds of BICM-ID based cooperative network o...

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Biennial Symposium on Communications, QBSC

作者： Shujaat Ali Khan Tanoli Imran Khan Nandana Rajatheva Telecommunications Asian Institute of Technology Pathum Thani Thailand

ISBN: (纸本)9781424457090;9781424457113

The performance of bit-interleaved coded modulation-iterative decoding (BICM-ID) based cooperative network is analyzed over Rayleigh and Nakagami-m fading channels. The relays are assumed to be operating in amplify-and-forward (AF) configuration. The bit error rate (BER) bounds of single-relay cooperative system with the serial concatenated BICM-ID using the 8-PSK modulations with maximal ratio combining (MRC) at the destination is obtained. For the numerical results of the union bound on BER, moment generating function (MGF) based approach is used and the closed-form MGF expression of the branch metric is derived. The comparisons of theoretical and simulation results are also shown.

关键词： Bit error rate Fading Interleaved codes modulation coding Decoding Performance analysis Relays Cooperative systems Concatenated codes Diversity reception

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Content Dependent Data Hiding on GSM Full Rate Encoded Speech

Content Dependent Data Hiding on GSM Full Rate Encoded Speec...

引用

International Conference on Signal Acquisition and Processing, ICSAP

作者： A. Shahbazi E. Soltanmohammadi A.H. Rezaei A. Sayadiyan S. Mosayyebpour Department of Electrical Engineering Amirkabir University of Technology Tehran Tehran Iran Amirkabir University of Technology Tehran Tehran IR

ISBN: (纸本)9781424457243;9780769539607

This paper introduces a steganographic approach to embed data on compressed speech bit stream in order to hide secret data. This method may be used by any kind of encoded bit stream, but this research concentrates on full rate (GSM 6.10) encoded bit stream. This method allows user to adjust embedded data bit-rate or speech quality. Speech quality is determined by Perceptual Evaluation of Speech Quality (PESQ) which is an objective testing. The effect of embedding data to each specific bit of GSM Full Rate coefficients, on speech quality has been investigated and the less important bits are selected to embed secret data. Meanwhile for approaching a higher speech quality, the data embedding positions are based on different speech frame types. In other words the proposed technique is modified to achieve a content dependent algorithm.

关键词： Data encapsulation GSM Modems Data communication Ground penetrating radar Speech codecs Throughput Bit error rate Algorithm design and analysis modulation coding

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Local spectrum sensing in non-Gaussian noise

Local spectrum sensing in non-Gaussian noise

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International Conference on Telecommunications (ICT)

作者： Sayed Jalal Zahabi Ali. A. Tadaion Statistical Signal Processing Laboratory Department of Electrical and Computer Engineering Yazd University Yazd Iran

This paper deals with the local spectrum sensing problem in non-Gaussian noise. It is of great importance to reliably detect the presence of licensed users in cognitive radio. This task highly depends on the noise distribution, thus it is important to characterize the noise behavior as best as possible. Although Gaussian assumption for noise is of interest due to many reasons, it sometimes fails to model the behavior of noise in practice. In this paper we present a local spectrum sensing scheme in a broad family of non-Gaussian noise. We reasonably assume that the Primary User (PU) signal is Phase Shift Keying (PSK) modulated, where the number of constellation points, M, and the symbol code sequence are unknown to the Secondary Users (SU), as in practice. We also assume that the SUs are unaware of the PU signal complex amplitude and the non-Gaussian noise variance. Within this framework, we obtain the Generalized Likelihood Ratio Test (GLRT) as our spectrum sensing scheme and propose an approximate implementation of the resulting GLRT. Simulation results show that our proposed scheme has an acceptable performance.

关键词： Gaussian noise Phase shift keying Cognitive radio Testing Phase modulation modulation coding Constellation diagram Signal processing Laboratories Gaussian distribution

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Turbo-trellis coded modulation under channel estimation inaccuracies

Turbo-trellis coded modulation under channel estimation inac...

引用

Iranian Conference on Electrical Engineering (ICEE)

作者： Mohammad Modarresi Seyed Mohammad-Sajad Sadough Department of Electrical Engineering Shahid Beheshti University Tehran Iran

ISBN: (纸本)9781424467600

Turbo-trellis coded modulation (TTCM) schemes are designed for reliable transmission over quasi-static fading channels. Assuming pilot-assisted channel estimation, practical limitations in power and the number of pilots lead to imperfect channel estimates. A general method for robust receiver design under channel estimation errors was recently proposed by Sadough and Duhamel. In this paper, this technique is applied to improve the TTCM reception performance under channel estimation errors. We compare our proposed reception method to conventional receivers (also called mismatched receivers) in terms of bit error rate and EXIT chart analysis. Our results confirm the adequacy of the proposed receiver for improving TTCM iterative decoding performance under channel estimation errors.

关键词： modulation coding Channel estimation Fading Bit error rate OFDM Iterative decoding Robustness Additive white noise AWGN Turbo codes

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A Combined MAC and Physical Resource Allocation Mechanism in IEEE 802.16e Networks

A Combined MAC and Physical Resource Allocation Mechanism in...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Sondes Khemiri Guy Pujolle Khaled Boussetta Nadjib Achir LIP6-University of Paris 6 Paris France L2TI-Institut Galilée University Paris Sud XIII Villetaneuse France

This paper addresses the issue of wireless resource allocation of a Mobile WiMAX cell based on OFDMA access technique. We compare two strategies: the MAX SNR which is the most used channel assignment technique and our proposal which is based on channel condition learning. As we distinguish four IEEE 802.16e-2005 service classes: UGS, rtPS, nrtPS and ErtPS, we combine these strategies with a scheduler block in order to satisfy the QoS constraints of these classes. In addition, we take into consideration the Adaptive modulation and coding (AMC) scheme, through the selection of the slot which is based on the modulation scheme. The main concern here is to propose a simple method to assign WiMAX physical resources called slot to satisfy QoS constraints of a user's scheduled MPDUs, which can be easily and efficiently used in a realistic Mobile WiMAX network.

关键词： Resource management WiMAX OFDM Quality of service modulation coding Frequency diversity Physical layer Downlink Streaming media Proposals

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