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检索条件"主题词=Modulation coding"

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A monolithic step-down SC power converter with frequency-programmable subthreshold z-domain DPWM control for ultra-low power microsystems

A monolithic step-down SC power converter with frequency-pro...

引用

European Conference on Solid-State Circuits (ESSCIRC)

作者： Ling Su Dongsheng Ma A. Paul Brokaw Department of Electrical and Computer Engineering University of Arizona Tucson Tucson AZ USA Analog Devices Inc.orporated Tucson AZ USA

This paper presents a fully integrated switched-capacitor (SC) power converter for ultra-low power microsystems. The design features an efficient step-down charge pump and a frequency-programmable digital feedback controller. The controller is designed in the subthreshold region to reduce power dissipation significantly. It employs a programmable switching frequency digital pulse-width modulation (DPWM) to maintain high efficiency under various loading scenarios, without causing random noise spectrum as in pulse-frequency modulation (PFM). The monolithic implementation effectively suppresses switching noises and glitches introduced by parasitic components from traditional bonding, packaging and PCB wiring. The test prototype was designed and fabricated with a 0.35-mum digital CMOS N-well process. It supplies a variable power output from 0.8 to 1.5 V and from 400 muW to 7.5 mW precisely, with a variable switching frequency ranging from 200 KHz to 1 MHz. The converter achieves 66.7% efficiency with a controller power of only 147.5 muW.

关键词： Frequency conversion Pulse modulation Switching frequency Digital modulation modulation coding Switching converters Charge pumps Adaptive control Power dissipation Space vector pulse width modulation

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modulation-mode and power assignment for MIMO-BICM schemes

Modulation-mode and power assignment for MIMO-BICM schemes

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ITG Workshop on Smart Antennas

作者： Andreas Ahrens Volker Kuhn Institute of Communications University of Rostock Rostock Germany

In this contribution we jointly optimize the number of activated MIMO layers and the number of bits per symbol along with the appropriate allocation of the transmit power under the constraint of a given fixed data throughput and integrity. In analogy to bit-interleaved coded irregular modulation, we introduce a MIMO-BICM scheme, where different signal constellations and mappings were used within a single codeword. EXIT charts are used for analyzing and optimizing the convergence behaviour of the iterative demapping and decoding.

关键词： MIMO Interleaved codes modulation coding Transmitters Constraint optimization Throughput Constellation diagram Signal mapping Iterative decoding Bandwidth

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An overview of multi-mode multi-user adaptation and scheduling techniques in mimo-based fourth-generation wireless systems

An overview of multi-mode multi-user adaptation and scheduli...

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IEEE Convention of the Electrical and ELectronic Engineers in Israel

作者： Arie Reichman Ruppin Academic Center Israel

MIMO-OFDM is widely recognized today as a key combination of technologies to achieve high spectral efficiency and high link reliability over space and frequency selective wireless channels, at a reasonable hardware cost. Both OFDM and MIMO have a variety of modes of operation and parameters and for each channel state, users¿ requirements of data transmission and criterion of estimation performance, there is an optimal scheme and set of parameters based on channel state information. Adaptive switching between MIMO-OFDMA schemes yields significant capacity gains over fixed transmission schemes. A combination of modulation and coding scheme and MIMO method maximizes the throughput whilst satisfying a predefined average BER.

关键词： Space technology MIMO Hardware Costs OFDM Data communication State estimation Channel state information modulation coding Throughput

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A Joint Coded Two-Step Interference Cancellation Technique for a Multiuser MIMO-SC-FDE System

A Joint Coded Two-Step Interference Cancellation Technique f...

引用

International Conference on Systems and Networks Communications (ICSNC)

作者： A. Aljohani J. Chambers Advanced Signal Processing Group Department of Electronic and Electrical Engineering Loughborough University Leicestershire UK

In this paper, we present a transceiver design for a broadband multiuser-MIMO communication system, where the co-channel users are equipped with multiple transmit and multiple receive antennas. In particular, we propose a joint coded two-step interference cancellation scheme which effectively combats the effect of co-channel interference (CCI) and inter-symbol interference (ISI) in multipath channels. To overcome the peak-to-average-power ratio limitation of multicarrier systems, the scheme employs single-carrier frequency-domain equalization (SC-FDE) based modulation combined with time-reversed space-time block codes (TR-STBC). The receiver performs minimum mean-squared error (MMSE) interference suppression at the first stage, and then, CCI cancellation is implemented with a bank of single-user channel decoders. Also, forward error correction outer convolutional encoding, and random bit interleaving are used to correct the carrier in deep fades. To verify the utility of the proposed approach, the paper also includes two sets of average symbol error rate simulations for two different channel models. The first set is for a frequency selective quasi-static fading channel while the secondset is for a Rayleigh fading channel modeled by a modified Jakes' model, both of which confirm the advantage of the proposed scheme.

关键词： Interference cancellation Radiofrequency interference Fading Transceivers Broadband communication Receiving antennas Interchannel interference Intersymbol interference Multipath channels modulation coding

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Performance enhancement of TCP over adaptive multi-rate IEEE 802.11 wireless LANs

Performance enhancement of TCP over adaptive multi-rate IEEE...

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IEEE Radio and Wireless Symposium (RWS formerly RAWCON)

作者： Kenichi Kashibuchi Tarik Taleb Abbas Jamalipour Yoshiaki Nemoto Nei Kato Graduate School of Information Sciences University of Tohoku Sendai Miyagi Japan School of Electrical and Information Engineering University of Sydney NSW Australia

This paper presents a new TCP window size adjustment scheme for the automatic rate fallback (ARF) algorithm. The proposed scheme utilizes the information about radio usage monitored on the IEEE 802.11 MAC layer. Each station calculates the maximum available window size on each long-lived connection based on these information when the data transmission/reception rate is switched, and limits the maximum sending window size. The performance of the proposed scheme is investigated and compared with that of standard TCP through several simulations. The simulation results show that the proposed scheme enhances the transmission efficiency of TCP.

关键词： Wireless LAN Media Access Protocol modulation coding Physical layer Australia Switches Condition monitoring Data communication Programmable control Adaptive control

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Performance evaluation of CSK spread spectrum Boomerang system

Performance evaluation of CSK spread spectrum Boomerang syst...

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International Symposium on Information Theory and Its Applications, ISITA

作者： Toru Sugimoto Tsuyoshi Arai Hiroshi Inai Faculty of Computer Science and System Engineering University of Oklahoma Soja Japan

ISBN: (纸本)9781424420681

In this paper, the spread-spectrum (SS) Boomerang system using code-shift-keying (CSK) is proposed. CSK is one of the orthogonal modulation systems which transmit an orthogonal code sequence according to information bits. The conventional SS-Boomerang system which used direct-sequence spread-spectrum (DS/SS) technique applies the spreading sequence to every information bits. However, since the proposed SS-Boomerang system uses CSK, it can transmit more than one information with one spreading sequence. It is able to improve information transmission rate. Moreover, it is shown that the bit error rate and distance ranging performance of the proposed system is superior to that of the conventional system.

关键词： Spread spectrum communication Bit error rate Communication systems modulation coding Bandwidth Interference Mobile communication AWGN channels Information theory Application software

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modulation codes for reader-tag communication on inductively coupled channels

Modulation codes for reader-tag communication on inductively...

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International Symposium on Information Theory and Its Applications, ISITA

作者： Angela I. Barbero Greg D. Horler Eirik Rosnes Oyvind Ytrehus Department of Applied Mathematics University of Valladolid Valladolid Spain Instrumentel and School of Electronic & Electrical Engineering University of Leeds UK

In this paper we study and compare methods for representing information for transmission on inductively coupled channels. We introduce combined runlength and power constraints on modulation codes for such channels, ca... 详细信息

ISBN: (纸本)9781424420681

关键词： modulation coding Amplitude modulation Costs Error correction codes Signal to noise ratio Additive noise Decoding Frequency synchronization Timing Couplings

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A gaze prediction technique for open signed video content using a track before detect algorithm

A gaze prediction technique for open signed video content us...

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IEEE International Conference on Image Processing

作者： S.J.C. Davies D. Agrafiotis C.N. Canagarajah D.R. Bull Department of Electrical and Electronic Engineering University of Bristol Bristol UK

This paper proposes a gaze prediction model for open signed video content. A face detection algorithm is used to locate faces across each frame in both profile and frontal orientations. A grid-based likelihood ratio track before detect routine is used to predict the orientation of the signer's head, which allows the gaze location to be localised to either the signer or the inset. The face detections are then used to narrow down the gaze prediction further. The gaze predictor is able to predict the results of an eye tracking study with up to 95% accuracy, and an average accuracy of over 80%.

关键词： Handicapped aids Face detection Video coding Multimedia communication Broadcasting Electronic mail Predictive models modulation coding Protection Detectors

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Performance analysis of a JTIDS/Link-16-type waveform transmitted over Nakagami fading channels with pulsed-noise interference

Performance analysis of a JTIDS/Link-16-type waveform transm...

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MILCOM, Military Communications Conference

作者： Chi-Han Kao Frank Kragh Clark Robertson Electrical and Computer Engineering Department Naval Postgraduate School Montreal CA USA

The Joint Tactical Information Distribution System (JTIDS) is the communication terminal of Link-16. JTIDS is a hybrid direct sequence/frequency-hopping spread spectrum system and features Reed-Solomon codes for channel coding, cyclic code-shift keying for 32-ary symbol modulation, minimum-shift keying for chip modulation, symbol interleaving, chip sequence scrambling and random jittering for transmission security, and a double-pulse structure for diversity. Assuming that coherent chip demodulation is practical, we investigate the probability of symbol error of a JTIDS/Link-16-type waveform for both the single- and the double-pulse structure transmitted over a slow, flat Nakagami fading channel in the presence of pulsed-noise interference (PNI) in this paper. In general, the results show that the double-pulse structure always outperforms the single-pulse structure, whether the PNI is present or not and whether the channel is fading or not. Furthermore, barrage noise interference has the most effect in degrading performance when signal-to-interference ratio (SIR) is small. When SIR is large, PNI with a smaller fraction of time that interference is on causes the greatest degradation.

关键词： Performance analysis Fading Interference modulation coding Degradation Frequency diversity Spread spectrum communication Reed-Solomon codes Channel coding Interleaved codes

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A Framework of Cross-Layer Superposition Coded Multicast for Robust IPTV Services over WiMAX

A Framework of Cross-Layer Superposition Coded Multicast for...

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IEEE Conference on Wireless Communications and Networking

作者： James She Xiang Yu Fen Hou Pin-Han Ho En-Hui Yang Electrical & Computer Engineering University of Waterloo Canada

A cross-layer design (CLD) framework for robust and efficient video multicasting over IEEE 802.16 (or WiMAX) is introduced. In the framework, multiple description coding on scalable video bitstreams at the source for achieving multi-resolution robustness is jointly designed with superposition coding (i.e., multi-resolution modulation) on multicast signals at the channel to overcome the channel diversity problem in wireless multicast. The resulting cross-layer coded multicast signals enable us to recover some lost bitstreams in high quality layers, which is not possible if multi-resolution modulation is used alone for multicasting as in previous works. Simulation results show that indeed our joint design outperforms the scheme using only superposition coded multicast by achieving better video quality for users under multi-user channel diversity.

关键词： Robustness IPTV WiMAX Cross layer design modulation coding Receivers Multiresolution analysis Web and internet services Equations Automatic repeat request

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