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检索条件"主题词=Modulation Coding"

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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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VTC2009-Spring in Barcelona [VTS news]

引用

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

作者： Don Hendrickson

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EMC-Influences on Digital Broadcasting Services in Vehicular Environments

EMC-Influences on Digital Broadcasting Services in Vehicular...

引用

International Zurich Symposium on Electromagnetic Compatibility (EMC Zurich)

作者： Niels Koch Weiteck Ltd. Am Schönen Bühl 4 D-63628 Bad Soden-Salmünster Germany nkoch@***

From home entertainment we know a number of digital entertainment sources which we cherish. Especially digital broadcasting, such as DAB, DVB, HD-Radio and SDARS just to name a few, are entering the automotive market. Premium car manufacturers are offering DAB, DVB-T as well as HD-Radio and SDARS as digital sound broadcasting for their customers. However, a lot of efforts need to be undertaken to get good performance. This paper deals with answering the often asked question, why digital broadcasting systems in vehicular environments do not perform as good as their theoretical performance should intend. With an excessive measurement campaign with a number of premium car manufacturers in Germany, we found three main arguments; a) the digital modulation becomes week in terms of bit-errors with enhanced data rates b) wideband modulation schemes, such as COFDM for example, are fragile in fading environments, especially reactive on frequency selective fading and c) used coding and modulation techniques can cope with single-frequency and single-event interferences well but not with permanent broadband interference, which are often found in EMC signatures in well-equipped luxury cars.

关键词： Digital video broadcasting Digital modulation Manufacturing modulation coding Fading Interference Automotive engineering Frequency measurement Wideband Electromagnetic compatibility

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Link Estimation Methods for Routing over FWA Mesh Network

Link Estimation Methods for Routing over FWA Mesh Network

引用

IEEE Conference on Wireless Communications and Networking

作者： Jun Nishioka Satoru Yamano Katsuhiko Yamada System Platforms Research Laboratories NEC Corporation Limited Japan

With the popularity of mobile communication, the importance of backbone network of the mobile networks, i.e. mobile backhaul networks, has increased significantly. With the decreasing size of mobile network system cells, it is considered next-generation mobile backhaul networks will be mesh-based. To reduce the operating expenses, i.e. OPEX, of the network, mobile network carriers are beginning to shift their circuit-switched networks to packet-switched networks. Most mobile backhaul networks are formed with microwave radios. To increase data rate, adaptive modulation and coding (AMC) is used for wireless links. As a result, the data rate of each wireless link changes over time and thus leads to unexpected packet loss or traffic degradation. This paper proposes a routing scheme and methods for estimating the transmission parameters or modes of wireless links to route bandwidth guaranteed flows over mobile backhaul networks. With estimation methods, degradation of existing flows caused by unexpected changes in the data rate of wireless links can be reduced. This paper shows using mode history of link to estimate the link quality can route bandwidth guaranteed flows efficiently by choosing more stable links for the path. We also show that link estimation methods are effective when mode distribution follows normal, uniform and Poisson distributions.

关键词： Routing Mesh networks Degradation Bandwidth Mobile communication Spine Next generation networking Circuits modulation coding Telecommunication traffic

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A 65nm CMOS low-noise direct-conversion transmitter with carrier leakage calibration for low-band EDGE application

A 65nm CMOS low-noise direct-conversion transmitter with car...

引用

IEEE Symposium on Radio Frequency Integrated Circuits (RFIC)

作者： Shin-Fu Chen Yi-Bin Lee Chih-Hao Sun Bing-Jye Kuo Guang-Kaai Dehng MediaTek Inc. Hsinchu Taiwan

ISBN: (纸本)9781424433773

A low-noise EDGE transmitter implemented in a 65nm CMOS process using direct-conversion architecture for low-band application is presented. The transmitter consists of a programmable-gain I/Q modulator, a frequency divider and a power detector for carrier leakage calibration. The design delivers maximum output power > 1.5 dBm with a 0.5 dB gain step for the 30 dB dynamic range and has < -68 dBc modulation spectrum at 400-kHz offset under maximum gain level. The out-of-band noise at 20 MHz offset with the power amplifier is -80.9 dBm with 100-kHz resolution bandwidth. The carrier leakage suppression after calibration can reach -50 dBc. The design consumes 21 mA at 1.5-V supply and 40 mA at 2.7-V supply and is housed in a 40-pin QFN package.

关键词： Transmitters Calibration Power amplifiers CMOS process Frequency modulation modulation coding Frequency conversion Leak detection Detectors Power generation

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Performance Analysis of Different Spread Spectrum Sequence Code on AWGN Channel

Performance Analysis of Different Spread Spectrum Sequence C...

引用

WRI World Congress on Software Engineering, WCSE

作者： YuJuan Sun Qunsan Xu Zengfeng Wang School of Computer Science and Technology Lu Dong University Yantai Shandong China

ISBN: (纸本)9781424435661

The communication model of DSSS is built through Simulink, in which the M-DPSK modem technology and the convolutional encoder are adopted. The antinoise performance on AWGN channel is studied on the different spread spectrum sequence code and different spread spectrum gain. The modulate methods can choose exactly in actual CDMA system and improve the quality of communication.

关键词： Performance analysis Spread spectrum communication AWGN channels modulation coding RF signals Mathematical model Convolution Demodulation Digital modulation Radio transmitters

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Relation between the peak to average power ratio and Doppler sidelobes of the multi-carrier radar signal

Relation between the peak to average power ratio and Doppler...

引用

IEEE International Conference on Radar

作者： R. F. Tigrek W. J. A. de Heij P. van Genderen Thales Netherlands Delft Netherlands Thales Netherlands Hengelo Netherlands IRCTR Delft University of Technnology Delft Netherlands

The performance of the multi-carrier radar signal is investigated using the ambiguity function. The multi-carrier waveform under consideration is modulated by random phase coding, with the intention to combine radar and communications and at the same time solve the Doppler ambiguity. The connection between the instantaneous power of the waveform and the Doppler sidelobes of the ambiguity function are explored. The variance of the Doppler sidelobes, which arises from the random phase coding of the carriers, is connected to the peak to average power ratio of the waveform.

关键词： Peak to average power ratio Doppler radar OFDM Pulse compression methods Pulse measurements Phase modulation Quadrature amplitude modulation Signal processing modulation coding Noise reduction

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Class based scheduling for DVB-S2

Class based scheduling for DVB-S2

引用

International Workshop on Satellite and Space Communications (IWSSC)

作者： Bernhard Collini-Nocker Thomas Soboll Department of Computer Sciences University of Salzburg Salzburg Austria

In this paper we use a combination of adaptive coding and modulation with Diff-Serv techniques to optimize bandwidth allocation within DVB-S2 satellite links and propose logical grouping of receivers. Especially for scenarios setups where receivers of specific services can be grouped, additional information concerning ab area of influence of this service can be utilized to down- or upgrade modulation scheme and coding rate with minimal impact on QoS.

关键词： Digital video broadcasting Satellite broadcasting modulation coding Adaptive coding Delay Encapsulation Physical layer Cross layer design Processor scheduling Channel allocation

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Simulation and analysis of performance of LTE in indoor environments

Simulation and analysis of performance of LTE in indoor envi...

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Mediterrannean Microwave Symposium (MMS)

作者： Víctor Torres Fermín Esparza Francisco Falcone EE Department Edif. Los Tejos Universidad Publica de Navarra (UPNA) Pamplona Spain

In this paper, system simulation for future 3GPP R8 Long Term Evolution (LTE) radio access channel in indoor environment is presented. 3D ray tracing algorithms have been developed in order to analyze coverage-capacity considerations regarding high order modulation schemes present in LTE. The results aid in modeling the behavior of high speed data services in future 4G systems in indoor environments.

关键词： Analytical models Performance analysis Indoor environments Ray tracing Interference Long Term Evolution Bit rate Receiving antennas modulation coding Delay estimation

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Satellite PHY-layer selector design for video applications in tropical areas

Satellite PHY-layer selector design for video applications i...

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International Workshop on Satellite and Space Communications (IWSSC)

作者： David Pradas Lei Jiang M.A. Vazquez Castro Paolo Barsocchi Francesco Potorti Department Telecommunication and Systems Engineering Universitat Autònoma Barcelona Barcelona Spain ISTI CNR Research Area Pisa Italy

This paper aims at providing different cost-efficient solutions for the channel impairments in tropical areas. In order to extend service to isolated areas, we propose an hybrid architecture based on DVB-S2/RCS + Wi-Fi networks. In this scenario, the delay of the ACM reaction to fade changes can affect the quality of the video transmission, especially because of the characteristics of tropical deep fading events. In order to avoid QoS reduction, we focus on the DVB PHY-layer shifted threshold, which we study not only for different Amazon areas and different rain conditions, but also for different reaction delays. The performance of the PHY-layer selector is evaluated in terms of video quality (PSNR), packet error rate and bandwidth efficiency.

关键词： Satellite broadcasting Digital video broadcasting Delay Quality of service Rain Bandwidth Streaming media PSNR Error analysis modulation coding

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