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检索条件"主题词=Modulation coding"

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Global design methods for raptor codes using binary and higher-order modulations

Global design methods for raptor codes using binary and high...

引用

MILCOM, Military Communications Conference

作者： Richard J. Barron Caleb K. Lo Jerome M. Shapiro MITRE Corporation USA

ISBN: (纸本)9781424452385

We develop accurate and robust one-dimensional EXIT chart methods to design raptor codes with binary and higher-order modulations on AWGN channels over any desired range of SNRs. We formulate the check-node degree distribution optimization as a linear program that optimizes a suitable objective function of the desired operating points. The throughput curves predicted by the analysis are easily compared across different pre-code rates and pre-code error-correcting capabilities. For higher-order modulations we employ BICM on standard Gray-mapped constellations. We further enhance the optimization by applying separate check-node degree distributions to the mapped MSBs and LSBs. Simulated throughput curves using the designed codes for QPSK and 16-QAM modulations on the AWGN channel show marked improvement over previously reported raptor code designs.

关键词： Design methodology modulation coding Throughput Decoding Robustness AWGN channels Quadrature phase shift keying Channel capacity Redundancy Collaboration

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MIMO Performance of the Next Generation DVB-T

MIMO Performance of the Next Generation DVB-T

引用

IEEE Conference on Vehicular Technology (VTC)

作者： P. Atanes A. Arrinda G. Prieto P. Angueira M. M. Velez P. Prieto Electronics and Telecommunications Department University of Basque Country (UPV-EHU) Bilbao Spain Robotiker-Tecnalia Parque Tecnológico Edificio 202 Zamudio Bizkaia Spain

This paper analyses the performance of a DTT (digital terrestrial television) broadcasting system that includes MIMO-OFDM techniques. The benefits of these techniques are studied comparing the results for different MIMO 2 x 2 (multiple input multiple output), MISO 2 x 1 (multiple input single output) and SISO (single input single output) system configurations. Different propagation channel models and configurations are considered for each diversity scheme. This study has been carried out in the context of development of the next generation DVB-T, called DVB-T2.

关键词： MIMO Digital video broadcasting Decoding Polarization Transmitting antennas modulation coding HDTV Performance analysis TV broadcasting Robots

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Iterative Channel Estimation Using Superimposed Pilot for BICM-OFDM

Iterative Channel Estimation Using Superimposed Pilot for BI...

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International Conference on Wireless Communications, Networking and Mobile Computing (WiCom)

作者： Yongzhi Yu Xingzhou Zhang Zhongmin Zhang School of Information and Communication Engineering Harbin Engineering of Technology Harbin China

The conventional superimposed pilot applied in OFDM system has drawback of low accuracy. An iterative channel estimation algorithm based on superimposed pilot is proposed for the combination of orthogonal frequency division multiplexing (OFDM) and bit-interleaved coded modulation (BICM) system. This algorithm makes full use of the information provided by decoding, and has two steps. Firstly, pilots are added to the transmitted signals. The initial estimation employs the first-order statistics. Secondly, using the hard-decision feedback information provided by the decoding of BICM , the information between the channel estimator and the decoder could be exchanged. The accuracy could be improved by the feedback information provided by iterative decoding of BICM. Through the wideband HF channel, the simulation results show that, compared with conventional superimposed pilot algorithm, the proposed algorithm efficiently improves the accuracy of channel estimation and BER performance after two iterations.

关键词： Channel estimation Iterative algorithms Iterative decoding Feedback Interleaved codes modulation coding OFDM modulation Statistics Wideband Hafnium

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Secret sharing in fast fading channels using obfuscated incremental-redundancy hybrid ARQ

Secret sharing in fast fading channels using obfuscated incr...

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MILCOM, Military Communications Conference

作者： Chan Wong Wong Eric Graves John M. Shea Tan F. Wong Wireless Information Networking Group Department of Electrical and Computer Engineering University of Florida Gainesville FL USA

In our previous work, we have shown that hybrid ARQ (HARQ) can be used to achieve secret communication over a fast fading channel. This is a physical-layer technique that can be used in conjunction with conventional cryptography to provide further protection from an eavesdropper. The key to our previous work was to use reliability-based HARQ to improve the decoder performance at the desired user much faster than at an eaves-dropper. In this paper, we propose a new HARQ approach that provides better secrecy performance by using the most-reliable received bits at the desired user to obfuscate information transmitted in the HARQ process. In addition, we present several other performance improvements, including transmitting incremental redundancy instead of repeating information and using bit-interleaved coded modulation with higher-order modulation. Performance measures such as information rate and fractional equivocation rate are provided to demonstrate that the obfuscated incremental-redundancy HARQ protocol is a promising candidate for secret sharing.

关键词： Cryptography Fading Automatic repeat request modulation coding Protection Decoding Redundancy Interleaved codes Information rates Protocols

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A New Steganographic Method Using Quantization Index modulation

A New Steganographic Method Using Quantization Index Modulat...

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International Conference on Computer and Automation Engineering, ICCAE

作者： Hamid Izadinia Fereshteh Sadeghi Mohammad Rahmati Computer Engineering and Information Technology Department Amirkabir University of Technology슠 Tehran Iran

Steganography is the art and science of hiding secret data to provide a safe communication between two parties and it is a prominent branch in the information hiding research area. This paper presents a new steganographic method based on predictive coding and embeds secret message in quantized error values via quantization index modulation (QIM). The proposed method is superior to previous methods in that it can make a satisfying balance among the most concerned criteria in steganography which are imperceptibility, hiding capacity, compression ratio and robustness against attacks. The performance of the proposed method is evaluated by several experiments on gray-level images with different textural properties. The new method is also compared with two renowned steganographic methods namely Jsteg and steganography based on predictive coding (SBPC). The results obtained from the experiments show that the proposed method has high visual quality and less histogram distortion while it has satisfactory compression ratio and embedding size.

关键词： Steganography Image coding Discrete cosine transforms Watermarking Quantization Transform coding Predictive coding Histograms Data engineering modulation coding

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On the Design of Pilot Symbol Assisted Codes

On the Design of Pilot Symbol Assisted Codes

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IEEE Conference on Vehicular Technology (VTC)

作者： Nicholas Bonello Sheng Chen Lajos Hanzo School of ECS University of Southampton UK

ISBN: (纸本)9781424425143

We propose a novel technique, hereby referred to as pilot symbol assisted coding (PSAC), where a predetermined fraction of binary pilot symbols is interspersed with the channel-coded bits at the channel coding stage, instead of multiplexing the pilots with the data symbols at the modulation stage, as in classic pilot symbol assisted modulation (PSAM). We will subsequently demonstrate that the PSAC-aided scheme succeeds in gleaning more beneficial knowledge from the inserted pilots, because the pilot bits are not only useful for estimating the channel at the receiver, but they are also beneficial in terms of significantly reducing the computational complexity of the channel decoder. Our results suggest that in the specific application example considered the PSAC-aided scheme requires up to 45% fewer message-passing updates per decoded bit than the corresponding channel coded PSAM benchmarker scheme.

关键词： Channel coding modulation coding Decoding Throughput Amplitude modulation Convergence Bit error rate Binary phase shift keying Quadrature phase shift keying Phase modulation

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Adaptive Puncturing for Coded OFDMA Systems

Adaptive Puncturing for Coded OFDMA Systems

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IEEE International Conference on Communications (ICC)

作者： M. Abdelhakim M. Nafie A. Shalash A. Y. Elezabi Center for Wireless Studies Cairo University Egypt Wireless Intelligent Networks Center Nile University Egypt Center of Wireless Studies Cairo University Egypt Electronics Engineering Department American University Cairo Egypt

A scheme is proposed for adaptively changing the code rate of coded OFDMA systems via changing the puncturing rate within a single codeword (SCW). In the proposed structure, the data is encoded with the lowest available code rate then it is divided among different resource blocks (tiles) where it is punctured adaptively based on some measure of the channel quality for each tile. The proposed scheme is compared against using multiple codewords (MCWs) where the transmitter divides the data over tiles and encodes them separately. We investigate two different adaptive modulation and coding (AMC) selection methods. The first is a recursive scheme that operates directly on the SNR whereas the second operates on the effective SNR value that is obtained using Mutual Information Effective SNR Mapping (MIESM). We then compare our scheme to Per-Frame Adaptation (PFA) where we fix the modulation and coding scheme (MCS) over a given frame. We show via simulations that when using the recursive rate selection method the SCW scheme significantly outperforms the MCWs and the PFA. It is also shown that applying the MIESM rate selection method, the PFA improves significantly, yet the SCW scheme is the best performer. We also introduce a novel interleaving method prior to puncturing that improves the performance for certain restricted adaptation mechanisms.

关键词： Tiles OFDM modulation modulation coding Interleaved codes Bit rate Transmitters Bit error rate Turbo codes Communications Society Intelligent networks

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Multidimensional Markov Models for the Cross-Layer Design of Multi-Rate Wireless Systems Using the Effective Capacity Function

Multidimensional Markov Models for the Cross-Layer Design of...

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IEEE Conference on Vehicular Technology (VTC)

作者： Loren Carrasco Jaume Ramis Guillem Femenias Mobile Communications Group University of Balearic Islands Spain

In this paper, a novel framework for the cross-layer design of wireless networks combining adaptive modulation and coding (AMC) at the physical layer with an automatic repeat request (ARQ) protocol at the data-link layer is proposed. In order to achieve this goal, the physical-layer service process is first modeled as a multidimensional finite-state Markov chain. Then, based on this multidimensional Markov model, the QoS performance at the data-link layer is characterized using the effective capacity approach. Queueing analysis using this effective capacity function is finally used in a cross-layer design approach aiming to satisfy the required average packet loss probability constraint by maximizing the average throughput of the system. Numerical examples are provided to show the advantages of our approach compared to other approaches using first-order amplitude-based finite state Markov models.

关键词： Multidimensional systems Cross layer design Automatic repeat request Wireless networks Adaptive systems modulation coding Physical layer Wireless application protocol Queueing analysis Capacity planning

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Quantization for soft-output demodulators in bit-interleaved coded modulation systems

Quantization for soft-output demodulators in bit-interleaved...

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IEEE International Symposium on Information Theory

作者： Clemens Novak Peter Fertl Gerald Matz Institut für Nachrichtentechnik und Hochfrequenztechnik University of Technology Vienna Austria

ISBN: (纸本)9781424443123

We study quantization of log-likelihood ratios (LLR) in bit-interleaved coded modulation (BICM) systems in terms of an equivalent discrete channel. We propose to design the quantizer such that the quantizer outputs become equiprobable. We investigate semi-analytically and numerically the ergodic and outage capacity over single- and multiple-antenna channels for different quantizers. Finally, we show bit error rate simulations for BICM systems with LLR quantization using a rate 1/2 low-density parity-check code.

关键词： Quantization Demodulation Interleaved codes modulation coding Bit error rate Decoding Parity check codes Receiving antennas Information rates Binary phase shift keying

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Automatic Identification Method of Link4A

Automatic Identification Method of Link4A

引用

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

作者： Bin-gang Zhu Shi-rui Peng Yuan-wei Su Tang Tang Department of Graduation Department Wuhan China Department of Information Countermeasures Wuhan China

Accurate identification of Link4A is the premise of performing effective jamming. Based on instantaneous information identification algorithm, three key features, including two new ones, are extracted which are used to identify 2FSK modulation signal: the maximum value of the spectral power density of the normalized-centered instantaneous amplitude gamma max , the mean of the absolute value of instantaneous frequency offset delta f and the standard deviation of the absolute value of instantaneous frequency offset . Simulation result indicates that the success rate reach 91.8% at SNR=-10 dB about 2FSK modulation signal. Then estimating the code-width of the 2FSK modulation signal, and comparing it with the real Link4A parameter, simulation result also indicates that the success rate reach 100% at SNR=5 dB. So, this mean has a high success rate under low SNR condition, and it would have a favorable using foreground.

关键词： Frequency shift keying Signal processing Frequency estimation modulation coding Data mining Aircraft Digital modulation Jamming Amplitude modulation Frequency modulation

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