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检索条件"主题词=Modulation coding"

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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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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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Error resilient video multicast using Randomized Distributed Space Time Codes

Error resilient video multicast using Randomized Distributed...

引用

International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Özgü Alay Pei Liu Yao Wang Elza Erkip Shivendra Panwar Department of Electrical and Computer Engineering Polytechnic Institute of New York University Brooklyn NY USA

In this paper we study a two-hop cooperative transmission scheme where multiple relays forward the data simultaneously using Randomized Distributed Space Time Codes (R-DSTC). We propose to integrate this randomized cooperative transmission with layered video coding and packet level Forward Error Correction (FEC) to enable error resilient video multicast. Data rates in both hops as well as the FEC rate are adopted to maximize the video quality. Our results show that while rate-adaptive direct transmission provides better video quality than conventional multicast, randomized cooperative scheme outperforms both strategies significantly.

关键词： Space time codes Relays Forward error correction Error correction modulation coding Rayleigh channels Computer errors Video coding Bandwidth Fading

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A Novel Radio Resource Management Scheme for Maximizing Uplink Capacity in M-WiMAX

A Novel Radio Resource Management Scheme for Maximizing Upli...

引用

IEEE Conference on Wireless Communications and Networking

作者： Georgios Theodoridis Fotini-Niovi Pavlidou Department of Electrical and Computer Engineering Aristotle University of Thessaloniki Thessaloniki Greece

ISBN: (纸本)9781424463961;9781424463985

Due to the AMC (Adaptive modulation and coding) mechanism adopted in the 802.16e physical layer, each connection's spectrum requirements depend on its SNR (Signal-to-Noise Ratio). Meanwhile, according to the OFDMA functionality, the limited transmission power of every terminal is divided among the simultaneously allocated subcarriers, i.e. a terminal's uplink SNR is reversely proportional to the number of occupied subcarriers. In this framework, the present paper introduces a Radio Resource Management (RRM) algorithm capable of minimizing bandwidth demands via adequately manipulating the subcarriers' assignment. The number of allocated subcarriers is not dictated solely by the connections' bitrate requirements, but it is particularly chosen so as to optimize the bits per symbol ratio via toggling between different AMC schemes.

关键词： Resource management Physical layer Bandwidth Bit rate WiMAX Wide area networks Communications Society modulation coding Communications technology Frequency conversion

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Performance Evaluation of the Markov Chain Monte Carlo MIMO Detector based on Mutual Information

Performance Evaluation of the Markov Chain Monte Carlo MIMO ...

引用

IEEE International Conference on Communications (ICC)

作者： M. Senst G. Ascheid H. Lüders Institute for Integrated Signal Processing Systems RWTH Aachen University Aachen Germany Institute of Communication Systems and Data Processing RWTH Aachen University Aachen Germany

Recently, MIMO detectors which are based on Markov Chain Monte Carlo (MCMC) simulation techniques have been proposed as alternatives to, e.g., the well-known sphere detector. In this paper, we present a systematic analysis of the performance of MCMC detectors. We study the impact of several parameters such as the list size and the number of independently running chains. As a performance criterion, our analysis is based on the mutual information over an equivalent modulation channel, rather than on coded bit error rates, because this metric is independent of the outer channel code and provides valuable insights over the whole SNR range of interest. Furthermore, we show that combining the MCMC detector with a hard-output sphere detector removes the error floor at high SNR, which is a well-known problem of the MCMC principle.

关键词： Monte Carlo methods MIMO Detectors Mutual information Performance analysis modulation coding Bit error rate Wireless communication Stochastic processes Niobium

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Mobile WiMAX: System performance on a vehicular multipath channel

Mobile WiMAX: System performance on a vehicular multipath ch...

引用

European Conference on Antennas and Propagation, EuCAP

作者： Rebeca Colda Tudor Palade Emanuel Pucchitä Irina Vermeçan Ancuta Moldovan Communications Department Technical University of Cluj-Napoca Cluj-Napoca Romania Communications Department Technical University of Cluj-Napoca 26-28 G. Bariţiu Street 400027 Cluj-Napoca Romania

One of the 4G broadband wireless access technologies that managed to impose, is mobile WiMAX (Worldwide Interoperability for Microwave Access) a technology developed according to the specifications of the IEEE 802.16 standard. It aims to deliver high data rates over wide areas, even in the case when the transmission takes place at vehicular speeds of up to 125 km/h. The current paper proposes to provide an optimum link adaptation of a fully compliant mobile WiMAX system operating at 2.3 GHz in a vehicular multipath fading channel (ITU-R M.1225 Veh.A). The evaluation of the system's performance was done starting from the quality of service (QoS) requirements imposed by certain types of applications. The results are expressed in terms of the most suited coding scheme, the achievable link throughput and operating range, the required receiver sensitivity as well as the adaptive modulation switching points.

关键词： WiMAX System performance Multipath channels Microwave technology Quality of service Technology management Standards development Fading Throughput modulation coding

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Local spectrum sensing in non-Gaussian noise

Local spectrum sensing in non-Gaussian noise

引用

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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Improved Error Protection for Uplink Control Signaling in 3GPP-LTE via Complex-Field coding

Improved Error Protection for Uplink Control Signaling in 3G...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Tumula V. K. Chaitanya Erik G. Larsson Niclas Wiberg Department of Electrical Engineering (ISY) Linkoping University Linkoping Sweden Ericsson Research Limited Linkoping Sweden

ISBN: (纸本)9781424425181;9781424425198

We study the uplink control signaling in 3GPP-Long Term Evolution (LTE) systems. Specifically, we propose a precoding method that uses complex-field coding (CFC) to improve the performance of the PUCCH format 2 control signaling. In the case of perfect channel state information (CSI) at the receiver and with a single receive antenna, the proposed method offers significant gains compared to the coding currently used in 3GPP-LTE. However the gains are marginal with two receive antennas. In order to examine the impact of channel estimation errors, we also derive the optimal detector for the case of imperfect receiver CSI, both for conventional coding and for the proposed CFC method.

关键词： Error correction Protection Throughput Automatic repeat request Protocols modulation coding Error analysis Channel estimation Transmitters Genetic expression

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Channel-Aware Subchannel Renumbering and Downlink Burst Allocation for IEEE 802.16 OFDMA Systems

Channel-Aware Subchannel Renumbering and Downlink Burst Allo...

引用

IEEE Conference on Wireless Communications and Networking

作者： Kuei-Ping Shih Hung-Chang Chen Chi-Tao Chiang Tsung-Han Hsieh Department of Computer Science and Information Engineering Tamkang University Taipei Taiwan Department of Information Technology Ching Kuo Institute of Management and Health Keelung Taiwan

ISBN: (纸本)9781424463961;9781424463985

This paper investigates the downlink burst allocation problem in IEEE 802.16 OFDMA system. In order to increase the subchannel utilization and to improve the network throughput, a channel-aware renumbering (CSR) scheme and a channel-aware downlink burst allocation (CDBA) scheme are proposed in this paper. CSR considers the difference among subchannel qualities of MSs and logically renumbers the subchannels so that each MS can have a group of subchannels supported the same and more efficient modulation and coding (MC) scheme. CDBA is to decide the size, shape and the position of each burst. Because of the rectangular burst allocation constraint, some slots in or among rectangular bursts will be wasted. These two kinds of slot wastage problems are defined as internal and external fragmentation problems in the paper. Therefore, in order to comply with the rectangular burst allocation constraint, to overcome the fragmentation problems and to increase the network throughput, CDBA is to determine the size and the position of each MS's burst based on the subchannel qualities of MSs and the bandwidth requirements. The simulation results show that CDBA with CSR outperforms other related approaches with or without CSR in terms of the throughput, the service ratio, the subchannel utilization and the DL-MAP overhead.

关键词： Downlink Throughput modulation coding Frequency domain analysis Physical layer Shape Bandwidth Communications Society Computer science Information technology

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Reference Phasor Based Log-Likelihood Ratios for Pilot-Symbol-Assisted BPSK Transmission of LDPC Codes over the Noncoherent Channel

Reference Phasor Based Log-Likelihood Ratios for Pilot-Symbo...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Elisa Mo Pooi Yuen Kam Department of Electrical & Computer Engineering National University of Singapore Singapore

We derive the log-likelihood ratio for iterative decoding of low-density parity-check codes transmitted using binary phase-shift-keying (BPSK) with pilot-symbol-assisted modulation. This is done with the aid of a reference phasor formed from the received pilot signals. We compare our metric with the existing Gaussian metric for differential BPSK transmission and also show that our metric converges to that for coherent BPSK transmission in the limit as the size of the pilot reference set becomes large. Simulation results verify our analysis and study the effects of carrier phase noise and signal-to-noise ratio mis-estimation on the performance of the metric.

关键词： Binary phase shift keying Parity check codes Iterative decoding Phase shift keying Phase modulation modulation coding Analytical models Signal analysis Performance analysis Phase noise

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