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检索条件"主题词=Modulation coding"

共 7237 条记录，以下是1411-1420 订阅

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Link Adaptation with Retransmissions for Partial Channel State Information

Link Adaptation with Retransmissions for Partial Channel Sta...

引用

IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference

作者： Stephan Pfletschinger Monica Navarro Centre Tecnològic de Telecomunicacions de Catalunya (CTTC) Parc Mediterrani de la Tecnologia Barcelona Spain

We consider the performance of adaptive coding and modulation (ACM) over a fading channel for the case that the transmitter has only partial channel state information (CSI). We evaluate the degradation due to the partial CSI in terms of additionally required SNR by simulations and an analytical approximation. Then, we propose an ACM scheme with fast link-level retransmissions based on cyclic incremental redundancy and compare its performance to an equivalent scheme based on Chase combining. For both HARQ (hybrid automatic repeat request) schemes, we develop an analytical approximation for the throughput and the delay.

关键词： Channel state information Adaptive coding modulation coding Fading Transmitters Degradation Analytical models Automatic repeat request Throughput Delay

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Iterative inter-symbol interference canceling receiver for direct space-time GF(q) LDPC modulation

Iterative inter-symbol interference canceling receiver for d...

引用

Asilomar Conference on Signals, Systems & Computers

作者： Adam R. Margetts Nicholas B. Chang Keith W. Forsythe D. W. Bliss MIT Lincoln Laboratory Advanced Sensor Techniques Group Lexington MA USA

Multiple-input multiple-output (MIMO) wireless communication systems enhance reliability and improve throughput for a given total transmit power. In actual systems, the channel and noise parameters must be estimated to capture the MIMO gains. In this paper, we couple a direct, q-ary Galois field [GF(q)], low-density parity-check (LDPC) space-time coding and modulation scheme with a receiver that iterates between decoding the transmitted symbols, estimating the convolutive MIMO channel with pilots and symbol decisions, and removing inter-symbol interference. The result is a powerful system that outperforms linear space-time equalization and performs within one decibel of a system with perfect channel knowledge and no inter-symbol interference.

关键词： Interference cancellation Parity check codes MIMO Power system reliability Wireless communication Throughput Noise cancellation Parameter estimation Galois fields modulation coding

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Optimization of signal points in Bit-Interleaved Coded modulation system with Iterative Decoding (BICM-ID)

Optimization of signal points in Bit-Interleaved Coded Modul...

引用

International Conference on Advanced Technologies for Communications, ATC

作者： Van Giao Nguyen The Cuong Dinh Department of Radio-Electronics Engineering Le Quy Don Technical University Hanoi Vietnam

A new method for adjusting positions of signal points of a traditional signal constellation used in the BICM-ID (Bit-Interleaved Coded modulation with Iterative Decoding) system is proposed. Optimal rotation angle versus SNRs (Signal-to-Noise Power ratios) in the sense of providing the system with attainable lowest BER (Bit Error Rate) are reported.

关键词： Interleaved codes modulation coding Iterative decoding Constellation diagram Bit error rate Communications technology Optimization methods Gaussian channels System performance Mathematical model

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A BICM-IDD scheme for non-coherent MIMO communication

A BICM-IDD scheme for non-coherent MIMO communication

引用

IEEE Radio and Wireless Symposium (RWS formerly RAWCON)

作者： Ramy H. Gohary Mohamed A. El-Azizy Timothy N. Davidson Department of Electrical and Computer Engineering McMaster University Hamilton ONT Canada

A bit-interleaved coded modulation (BICM) scheme with iterative (soft) demapping and decoding (IDD) is developed for non-coherent communication over a multiple-input multiple-output (MIMO) channel. The scheme exploits the underlying Grassmannian geometry of the signalling scheme that approaches the ergodic capacity of the non-coherent model at high signal-to-noise ratios. This geometry guides the construction of the MIMO constellation and gives rise to a computationally-efficient list-based demapping algorithm. The incorporation of a scheme that enables the decoder to augment the demapping list virtually eliminates the mild performance degradation of the efficient demapper. Simulation results demonstrate that at high data rates the proposed scheme can provide significantly better performance than several training-based BICM-IDD schemes.

关键词： MIMO Solid modeling Signal to noise ratio Interleaved codes modulation coding Iterative decoding Computational geometry Degradation Transceivers Transmitters

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Proactive vs. Reactive DVB-RCS Terminal Using ACM Techniques

Proactive vs. Reactive DVB-RCS Terminal Using ACM Techniques

引用

IEEE International Conference on Communications (ICC)

作者： S. Bracciali R. Fantacci T. Pecorella L. Chisci M. A. V. Castro CNIT Unit Università di Firenze Florence Italy Department di Sistemi e Informatica Università di Firenze Florence Italy Dpt of Telecommunications and System Engineering Universitat Autònoma Barcelona Barcelona Spain

The paper studies the performance of the bandwidth request procedure for a proactive digital video broadcasting - return channel satellite (DVB- RCS) terminal in comparison with a reactive one. The proactive terminal uses an adaptive predictor to forecast the future input traffic flow along with a predictive bandwidth controller to generate bandwidth requests according to a receding horizon policy. On the other hand, the reactive terminal generates requests, at the end of each frame, depending on the current queue lengths [1] [2]. The simulated scenario involves adaptive coding and modulation (ACM) techniques and Quality of Service (QoS) management. Simulation experiments highlight the effectiveness of the proactive bandwidth control under different traffic load and channel conditions.

关键词： Digital video broadcasting Bandwidth Quality of service Satellite broadcasting Programmable control Adaptive control Traffic control Adaptive coding modulation coding Quality management

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Efficient mapping of VoIP traffic in wireless OFDMA systems using semi-fixed allocations

Efficient mapping of VoIP traffic in wireless OFDMA systems ...

引用

International Conference on Broadband Networks (BroadNets)

作者： Itzik Kitroser Eldad Chai Yehuda Ben-Shimol Nathalie Yarkoni

This paper addresses the problem of efficient broadcasting of resource allocations descriptors for CBR applications (e.g., VoIP) in OFDMA-based wireless systems. In such systems mapping is the process of allocating resources and representing them is the mapping overhead. Existing mapping algorithms require an allocation descriptor to be broadcast in each frame for each allocated resource for every served subscriber. Information concerning the allocations is crucial for proper system operation, therefore it is broadcast on the wireless down link with low modulation and high repetition rate. The mapping overhead which is a function of the number of served subscribers is usually large and consumes a substantial part of down link resources. We present the notion of semi fixed allocations that allows a substantial reduction of the mapping overhead. We show that by taking advantage of the periodicity of VoIP frames and by applying semi fixed allocations in the existing resource allocation process, the mapping overhead can be reduced substantially. We present an innovative system model for the problem on hand and for evaluating the solutions. Using this model we show that the problem is in NP hard and present a set of observations on the resource allocation process leading to good mapping decisions from the perspective of mapping overhead. We present new mapping algorithms implementing those mapping decisions and show that by extensive simulations with these mapping algorithms the overhead can be reduced to 10% of the overhead experienced in OFDMA-based systems such as WiMAX and IEEE802.16, while retaining a low computational complexity.

关键词： Resource management Broadcasting WiMAX Job shop scheduling Wireless communication Streaming media modulation coding Computational modeling Computational complexity Frequency conversion

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Systematic Repeat Accumulate codes for bit-interleaved coded modulation with iterative demapping over AWGN and Rayleigh fading channels

Systematic Repeat Accumulate codes for bit-interleaved coded...

引用

International Symposium on Wireless Pervasive Computing (ISWPC)

作者： Wei Kwang Han Stephane Y. Le Goff Bayan S. Sharif School of Electrical Electronic and Computer Engineering University of Newcastle Newcastle-upon-Tyne UK

Repeat accumulate (RA) codes are the simplest one in the family of the capacity approaching codes, with great potential in the applications of modern communications systems. RA codes combine both the advantages of turbo codes and LDPC codes and are implemented using a turbo code representation to perform encoding and an LDPC code representation to perform decoding. The RA interleaver is chosen by random construction using the bit-filling method. In this paper, we investigate the performances of bit interleaved coded modulation (BICM) with iterative decoding and BICM with iterative decoding and demapping (BICM-ID) for bandwidth-efficient transmission. Both BICM and BICM-ID systems using systematic RA codes with Gray labelling on AWGN and Rayleigh fading channels are considered. Simulation results are presented for 16-QAM examples for rates frac12 and frac34.

关键词： Interleaved codes modulation coding AWGN Fading Iterative decoding Parity check codes Labeling Demodulation Turbo codes Digital modulation

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Reverse Concatenation with Maximum Transition Run (MTR) Codes for High-Density Perpendicular Recording

Reverse Concatenation with Maximum Transition Run (MTR) Code...

引用

IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference

作者： Mario Blaum Richard Galbraith Ksenija Lakovic Bruce Wilson Hitachi Global Storage Technologies Inc. San Jose CA USA

We present a reverse concatenation (RC) architecture with maximum transition run (MTR) modulation codes and Reed-Solomon (RS) error-correction codes (ECCs). The scheme employs a high-rate primary (pre-RS) MTR code and a secondary (post-RS) MTR code, which controls error propagation. The two modulation codes are designed in such a way to maximize the overall code rate and maintain simple hardware implementation. Simulation results demonstrate superior performance compared to reverse concatenation with non-MTR codes, especially at a relatively high recording density.

关键词： Perpendicular magnetic recording modulation coding Error correction codes Magnetic recording Code standards Reed-Solomon codes Magnetic modulators Detectors Maximum likelihood decoding Disk recording

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Contents

Contents

引用

International Conference on Wireless Communication and Sensor Networks

The following topics are dealt with: routing protocol; radio networks; computer networks; cryptography; quality of service; telecommunication network management; antennas; radiofrequency interference cancellation; multi-access systems; modulation; multi-user detectors; artificial neural networks; call admission control; telecommunication channel; and codes.

关键词： Routing protocols Radio network Computer network management Cryptography Quality of service Telecommunication network management Radiofrequency interference Interference cancellation modulation coding Detectors

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Golay code based carrier phase recovery

Golay code based carrier phase recovery

引用

International Conference on Emerging Technologies, ICET

作者： Aamir Hussain Mohammad Bilal Malik Department of Electrical Engineering College of Electrical & Mechanical Engg National University of Science and Technology Rawalpindi Pakistan

In this paper we present a Golay code based carrier phase recovery scheme. Golay code is a pair of complementary codes. Golay codes have been used for channel coding in communications. We have used the side lobe suppression property of Golay Code in recovery of the phase of the carrier. We begin with the discussion of side lobes suppression property of the Golay code. Then we present the pass band scheme i.e. the QPSK scheme for the transmission of Golay code, and the algorithm for the recovery of the phase of Golay Code based QPSK signal. We have adopted the serial search, parallel phase search and maximum likelihood estimation (MLE) techniques for carrier phase recovery. Carrier phase recovery algorithm using Golay code is a new addition in the carrier phase recovery methods. This new scheme exhibits excellent carrier phase recovery performance. With its sound mathematical basis, the Golay code based carrier phase recovery algorithm is expected to become an important tool in communications and carrier phase recovery applications.

关键词： Quadrature phase shift keying Maximum likelihood estimation modulation coding Educational institutions Channel coding Autocorrelation Delay Binary phase shift keying Transmitters Phase distortion

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