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检索条件"主题词=Modulation coding"

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Adaptation of modulation, coding, and Power for High-Rate Direct-Sequence Spread Spectrum

Adaptation of Modulation, Coding, and Power for High-Rate Di...

引用

MILCOM, Military Communications Conference

作者： Michael B. Pursley Thomas C. Royster Clemson University Clemson SC US

Communication devices that employ adaptive transmission protocols can exploit good channel conditions to increase throughput and compensate for poor channels to enhance survivability. We examine the performance of a protocol for the combined adaptation of the modulation, error-control-code, and transmitter power in high-rate direct-sequence spread-spectrum systems. The protocol requires only simple statistics that are obtained easily from the demodulator and decoder, and only a few bits of feedback are required in each acknowledgment packet.

关键词： modulation coding Spread spectrum communication Interference Protocols Radio transmitters Information rates Degradation Throughput Feedback Error correction

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Adaptive modulation and coding for turbo receivers in space-time BICM

Adaptive modulation and coding for turbo receivers in space-...

引用

IEEE Conference on Wireless Communications and Networking

作者： C. Hermosilla L. Szczecinski Institut National de la Recherche Scientifique INRS-EMT Montreal Canada

Adaptive modulation and coding (AMC) consists in adjusting the transmission parameters according to the channel state which affects the performance of the receiver. Practical implementation of the AMC is commonly done in scalar channels, where the signal to noise ratio characterizes sufficiently well the quality of the transmission. In this paper, we propose to use the AMC in matrix (MIMO) channels with the receiver employing the iterative (turbo) processing. Such solutions were not yet proposed in the literature due to the lack of appropriate performance evaluation tools. In the paper we employ the recently proposed method based on the so-called EXIT analysis, which was shown to predict accurately the performance of the turbo receivers. The numerical results obtained in the space-time bit-interleaved coded modulation MIMO transmission indicate that the throughput obtained exceeds considerably a non-adaptive transmission, and approaches the optimal water-filling solution

关键词： modulation coding MIMO Transmitters Signal to noise ratio Interleaved codes Fading Interference Bit error rate Equalizers Transceivers

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Energy-Efficient MISO Systems Using Adaptive modulation and coding

Energy-Efficient MISO Systems Using Adaptive Modulation and ...

引用

Asilomar Conference on Signals, Systems & Computers

作者： Antonio G. Marques Xin Wang Georgios B. Giannakis Department of Signal Theory and Communications Universidad Rey Juan Carlos de Madrid Madrid Spain Department of Electrical Engineering Florida Atlantic University Boca Raton FL USA Department of Electrical and Computer Engineering University of Minnesota Minneapolis MI USA

By viewing the coherent wireless sensor network (WSN) setup as a distributed space-time multi-input single-output (MISO) system, we minimize average transmit-power when sensors communicate with a fusion center (FC) using adaptive modulation and coding over a wireless fading channel. To this end, we derive optimal distributed beamforming and resource allocation strategies when the full (F-) channel state information at the transmitters (CSIT) is available, or, each sensor has F-CSIT of its own link with the FC but only quantized CSIT of other sensors through finite-rate feedback. Numerical results are presented to evaluate the power savings of the novel strategies.

关键词： Energy efficiency Adaptive systems modulation coding Wireless sensor networks Sensor fusion Sensor systems Fading Array signal processing Resource management Channel state information

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modulation and coding Techniques for Infrared Wireless Local Area Networks

Modulation and Coding Techniques for Infrared Wireless Local...

引用

International Conference on Computer Engineering and Systems

作者： T. Aaron Gulliver Department of Electrical and Computer Engineering University of Victoria Victoria BC Canada

Because of low-cost optical devices and virtually unlimited bandwidth, optical wireless communications (OWC) for indoor wireless local area networks (WLANs) has become an attractive alternative to radio frequency systems. Since optical signals cannot penetrate through walls or other opaque barriers, the security of infrared WLANs is very high and there is no interference between rooms. This makes cell planning easier, and the potential capacity of an optical-based network in a building is extremely high. However, an optical link is susceptible to path loss and multipath dispersion. In addition, the average transmit power is constrained by eye-safety regulations and power consumption concerns. modulation, equalization and error-control coding techniques are considered to overcome these drawbacks, especially the effects of multipath dispersion. Pulse-position modulation (PPM) has been employed for IrDA and IEEE802.11 standards because it offers high power efficiency. We introduce a combination of pulse-amplitude modulation (PAM) and differential pulse-position modulation (DPPM), named differential amplitude pulse-position modulation (DAPPM), in order to gain a better compromise between power and bandwidth efficiency. Since these modulation schemes over an ISI channel can be represented by a trellis diagram, their channel capacity is determined using a method for calculating the capacity of a Markov process channel. Although maximum-likelihood sequence detection (MLSD) is the optimal soft decision decoder (SDD) for DPPM systems, its complexity is extremely high. We examine SDDs which are less complex than MLSD, but have performance close to that with MLSD.

关键词： modulation coding Wireless LAN Pulse modulation Optical modulation Amplitude modulation Optical devices Bandwidth Optical fiber networks Wireless communication Radio frequency

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Utility Maximization of Layered Video Multicasting for Wireless Systems with Adaptive modulation and coding

Utility Maximization of Layered Video Multicasting for Wirel...

引用

IEEE International Conference on Communications (ICC)

作者： Jing Shi Daiming Qu Guangxi Zhu The Electronics and Information Engineering Department Huazhong University of Science and Technology Wuhan China

Layered video multicasting can be used to accommodate the heterogeneity of users and their receive channels in wired and wireless system. In a wireless system using adaptive modulation and coding (AMC), total utility of all users can be increased by transmitting the video layers over different AMC modes and allocating proper bandwidth to these video layers. In this paper, it is shown that when the utility function is convex, the utility maximization problem can be formulated into a convex optimization problem. Then several important practical issues like limitation of layer numbers and operational layer rates are considered. With these limitations and no convex constraint on utility function, a genetic algorithm (GA) is proposed to maximize the total utility by layer rate allocation and selecting AMC modes to transmit the video layers. A 7-cell cdma2000 HDR system is used in the simulation to show the performance of the proposed methods.

关键词： Adaptive systems modulation coding Wireless networks Bandwidth Genetic algorithms Multicast algorithms Channel allocation TV broadcasting Internet Dynamic programming

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Unequally Error Protected Data Partitioned Video with Combined Hierarchical modulation and Channel coding

Unequally Error Protected Data Partitioned Video with Combin...

引用

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

作者： M.M. Ghandi B. Barmada E.V. Jones M. Ghanbari Department of Electronic Systems Engineering University of Essex Colchester UK

This paper presents an efficient unequal error protection (UEP) approach for data partitioned video over wireless channels. We consider two methods: 1) forward error correction (FEC) with variable code-rates, and 2) hierarchical quadrature amplitude modulation (HQAM) combined with FEC with a fixed code-rate. In a low-delay application, the variable bit rate ratio between the high-priority and low-priority layers imposes certain constraints on these two methods. These constraints are discussed and solutions are proposed. Simulation results with an H.264 video codec show that combined HQAM and FEC outperforms FEC alone in both Gaussian and fading channels while having advantage over the nonlayered transmission

关键词： Protection modulation coding Channel coding Error correction codes Forward error correction Delay Bit rate Streaming media Switches Data engineering

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modulation and coding

Modulation and Coding

引用

IEEE International Symposium on Power Line Communications and Its Applications (ISPLC)

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A Markov based method for modulation and coding scheme (MCS) with hybrid ARQ retransmission

A Markov based method for modulation and coding scheme (MCS)...

引用

IFIP International Conference on Wireless and Optical Communications Networks (WOCN)

作者： Fan Chen Su Lijun Chen Meiya Yang Dacheng School of Telecommunication Engineering Beijing University of Posts and Telecommunications Beijing China

A Markov based method for modulation and coding scheme (MCS) selection is proposed for pilot assistant adaptive modulation and coding scheme (AMC) with hybrid ARQ (HARQ) retransmissions. A first-order finite-state Markov model (FSMM) is introduced to represent the time correlation character of channel fading during (channel quality indicator) CQI feedback and HARQ retransmissions. According to different QoS targets, such as maximizing the air interface throughput or maintaining a target frame error rate (FER) for each user, the Markov based method can deduce different reference pilot thresholds for each MCS. Theoretical analysis and link level simulation results both show the efficiency of the Markov based method for pilot threshold calculation according to different QoS target and different HARQ retransmission times

关键词： modulation coding Automatic repeat request Throughput Fading Feedback Delay Multiaccess communication Error analysis Analytical models Downlink

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Cross-Layer Design for Combining Adaptive modulation and coding with Hybrid ARQ to Enhance Spectral Efficiency

Cross-Layer Design for Combining Adaptive Modulation and Cod...

引用

International Conference on Broadband Networks (BroadNets)

作者： Dalei Wu Song Ci Department of Computer and Electronics Engineering University of Nebraska Lincoln Omaha NE USA

To enhance spectral efficiency and channel utilization in future wireless communication systems, adaptive modulation and coding (AMC) has been advocated at the physical layer. However, since the constellation size and coding rate are chosen based on the corresponding carrier-to-noise ratio (CNR) region, AMC can not guarantee to achieve the maximum spectral efficiency, especially when the number of available AMC modes are limited and the current CNR is low. In this paper, we present a scheme for spectral efficiency enhancement under fading channels. The proposed scheme combines AMC at the physical layer with hybrid automatic repeat request (HARQ) at the data link layer in a cross-layer fashion, where the upper layer HARQ provides an effective means to fine-tune the performance of the lower layer AMC. Both type-I and type-II HARQ are considered in our design. We have analyzed the system PER performance and the spectral efficiency of the proposed cross- layer design scheme. Numerical results show that our scheme can achieve maximum spectral efficiency while satisfying QoS requirements. The cross-layer design with AMC and type-II HARQ provides a large spectral efficiency improvement over the design with AMC and type-I HARQ.

关键词： Cross layer design modulation coding Automatic repeat request Fading Error correction codes Delay Physical layer Wireless communication Error correction Redundancy

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VTC2009-Spring in Barcelona [VTS news]

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IEEE Vehicular Technology Magazine 2009年第2期4卷 90-91页

作者： Don Hendrickson

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