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检索条件"主题词=Modulation coding"

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Broadband RF communications in underwater environments using multi-carrier modulation

Broadband RF communications in underwater environments using...

引用

IEEE International Conference on Systems, Man and Cybernetics

作者： Brian Kelley Kranthi Manoj Mo Jamshidi Department of ECE University of Technology San Antonio USA

We describe new methods that solve well-known problems associated with high throughput, robust communication in underwater environments. By robust, we imply simultaneous increases in enabled underwater communication data rates, range, and reliability. Our methods borrow concepts from advanced multi-carrier modulation using orthogonal frequency division multiplexing (OFDM), multiple input multiple output (MIMO) space time codes (e.g. Alamouti diversity), and zero carrier frequency ultra wideband (UWB) wireless. In addition, we discuss system optimization involving the elimination of the phase synthesizer and analog mixer through direct sampling of the RF antenna port.

关键词： Broadband communication Radio frequency Underwater communication OFDM modulation Robustness MIMO Throughput Frequency modulation modulation coding Space time codes

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Mixed TUSC and Band AMC Permutation Zone in OFDMA Systems with Limited Feedback

Mixed TUSC and Band AMC Permutation Zone in OFDMA Systems wi...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： I. Gutierrez J. L. Pijoan F. Bader Research Group Electromagnetism and Communications Enginyeria i Arquitectura La Salle Universitat Ramon Llull Barcelona Spain Centre Tecnològic de Telecomunicacions de Catalunya Spain

In this paper a new permutation zone which combines adjacent and distributed subcarrier permutation is proposed for Orthogonal Frequency Division Multiple Access (OFDMA) systems. For such purpose two types of burst are defined: localized and distributed. A new resource allocation and scheduling algorithm that exploits such structure is then proposed. Furthermore, the effects of limited feedback are also investigated where only the n-best subchannel quality metrics are feedback. As shown in the simulation results, a tradeoff between spectral efficiency, delay and load signaling requirements is obtained which can be adjusted by modifying the number of subchannels signaled in the uplink. Additionally, the proposed scheme turns out to be a very efficient way to increase the system fairness and therefore improving the quality of service.

关键词： Feedback Resource management Frequency conversion Bandwidth modulation coding Frequency diversity Telecommunications Irrigation Scheduling algorithm Delay

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Low power high speed UWB modem

Low power high speed UWB modem

引用

IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB)

作者： Ozgur Dural Samir S. Soliman Qualcomm Inc. San Diego CA USA

With many emerging technologies focusing on high speed data delivery at short distance, power consumption of the UWB modem must be optimized for it to be a competitive solution. We show that we can trade extra link margin with savings on power consumption effectively by changing the constraint length of convolutional code and using QPSK when operating at data rates 320 Mbps and up. We also present a new link adaptation algorithm using this flexibility, which provides 33% savings on power at LLR and Decoder blocks.

关键词： Modems Decoding Viterbi algorithm Energy consumption Convolutional codes Quadrature phase shift keying Phasor measurement units Physical layer Batteries modulation coding

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Tunable N-path mismatch shaping for multibit bandpass delta-sigma modulators

Tunable N-path mismatch shaping for multibit bandpass delta-...

引用

Asilomar Conference on Signals, Systems & Computers

作者： Waqas Akram Earl E. Swartzlander Department of Electrical and Computer Engineering University of Technology Austin TX USA

Many radio applications require the use of programmable bandpass ¿¿ converter. In the digital-to-analog converter (DAC) used within a ¿¿ converter, non-linearities created by DAC element mismatch error can be spectrally shaped to fall outside the signal band. The mismatch shapers within these converters thus also need to be programmable in order to follow the signal band. This paper proposes a new technique that tunes the center frequency of a mismatch noise transfer function while using an arbitrary mismatch shaping algorithm.

关键词： Delta modulation Noise shaping modulation coding Linearity Frequency Transfer functions Baseband Filters Application software Signal to noise ratio

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Lab Performance Analysis of a 4G LTE Prototype

Lab Performance Analysis of a 4G LTE Prototype

引用

IEEE Conference on Wireless Communications and Networking

作者： Shirish Nagaraj Sanjeev Garg Frank Liang Weidong Yang Nitin Mangalvedhe John Haug K. V. Pradap Home and Networks Mobility Motorola Inc. Arlington Heights IL USA

The uplink performance of a 4G LTE system, which includes an eNodeB modem and higher layer network elements, is presented in this paper. The physical layer link performance of this pre-commercial prototype, along with comparisons to simulations, is presented. The performance characterization in the lab is done for the shared channel as well as the control channel. Further, we present a demonstration of adaptive modulation and coding capabilities in the LTE uplink.

关键词： Performance analysis Prototypes Modems Physical layer Throughput Frequency estimation modulation coding Traffic control System testing AWGN

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Iterative equalization for underwater acoustic channels using bit interleaved coded modulation and decision feedback equalization

Iterative equalization for underwater acoustic channels usin...

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OCEANS - Europe

作者： C. P. Shah C. C. Tsimenidis B. S. Sharif J. A. Neasham School of Electrical Electronics and Computer Engineering University of Newcastle Newcastle-upon-Tyne UK

An iterative receiver scheme combining decision feedback equalizer (DFE) and bit interleaved coded modulation (BCIM-ID), suitable for transmission over frequency selective channels with large delay spread is proposed, where adaptive equalization and channel decoding are jointly optimized. Extensive simulation results presented for a realistic underwater time varying multipath channel exhibiting multipath delay spread of the order of 10 ms for data rates of 8 kbps, demonstrate that the proposed receiver not only reduces intersymbol interference and error propagation in the DFE, but also provides better bit error rate (BER) performance than the system employing turbo codes.

关键词： Decision feedback equalizers Underwater acoustics Interleaved codes modulation coding Bit error rate Frequency Delay Adaptive equalizers Iterative decoding Time varying systems

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Rateless unequal error protection codes for the additive white Gaussian noise channel

Rateless unequal error protection codes for the additive whi...

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MILCOM, Military Communications Conference

作者： Kevin P. Boyle Philip J. Lin Christopher C. Yu MITRE Corporation Bedford MA USA The Charles Stark Draper Laboratory Inc. Cambridge MA USA

Unequal error protection (UEP) and rateless coding are both methods used to combat channel uncertainty. With a rateless code, the code rate automatically adapts to the channel quality through the use of incremental redundancy. However, a rateless code lacks the ability to differentiate priorities and all bits suffer the same long delay in poor channel conditions. In contrast, UEP ensures reliable reception of higher priority bits and drops lower priority bits if the channel condition is poor. All bits can be decoded if the channel condition is above a design threshold. Enabling prioritization is one main advantage of UEP. While UEP is often highly desirable, it is constrained by the fixed design points for the various priority levels. That is, the minimum required signal-to-noise ratio (SNR) for each priority must be specified a priori. The multiple thresholds cannot be matched by the channel simultaneously, resulting in a loss in throughput. We create a coding scheme for the additive white Gaussian noise (AWGN) channel that has both rateless and unequal error protection advantages. We will use the abbreviation RUEP to refer to a rateless unequal error protection code. An RUEP code prioritizes the bitstream, as traditional UEP does, but by layering multiple rateless codes, the RUEP code is more efficient than a traditional UEP code.

关键词： Error correction codes Additive white noise AWGN Decoding Signal to noise ratio Throughput modulation coding Laboratories Delay Transmitters

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Storage coding for wear leveling in flash memories

Storage coding for wear leveling in flash memories

引用

IEEE International Symposium on Information Theory

作者： Anxiao Jiang Robert Mateescu Eitan Yaakobi Jehoshua Bruck Paul H. Siegel Alexander Vardy Jack K. Wolf Department of Computer Science Texas A&M University College Station TX U.S.A. California Institute of Technology Pasadena CA U.S.A. Electrical and Computer Engineering University of California San Diego La Jolla CA U.S.A.

ISBN: (纸本)9781424443123

NAND flash memories are currently the most widely used flash memories. In a NAND flash memory, although a cell block consists of many pages, to rewrite one page, the whole block needs to be erased and reprogrammed. Block erasures determine the longevity and efficiency of flash memories. So when data is frequently reorganized, which can be characterized as a data movement process, how to minimize block erasures becomes an important challenge. In this paper, we show that coding can significantly reduce block erasures for data movement, and present several optimal or nearly optimal algorithms. While the sorting-based non-coding schemes require O(n log n) erasures to move data among n blocks, coding-based schemes use only O(n) erasures and also optimize the utilization of storage space.

关键词： Flash memory Nonvolatile memory Computer science Lifting equipment Postal services Scattering Statistics File systems Error correction codes modulation coding

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On destructive superposition of shaping pulses in band-limited linear modulation systems

On destructive superposition of shaping pulses in band-limit...

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IEEE International Symposium on Information Theory

作者： Makoto Tanahashi Hideki Ochiai Department of Electrical and Computer Engineering Yokohama National University Yokohama Kanagawa Japan

ISBN: (纸本)9781424443123

We analyze pulse-shaped transmit signals with correlated input sequences in the framework of band-limited liner modulations. These signals are formed by superposition (convolution) of the shaping pulses and may have different amplitude statistics depending on the correlation properties of the input sequences. Hence, even if the sequences have a unit average power in discrete-time domain, the resulting transmit signals exhibit smaller (or larger) average power if there are many destructive (or constructive) superpositions produced by the correlated source. Since such a reduction of average transmit power does not change the amplitude of the underlying discrete-time sequence, one may expect the so-called shaping gain. We comprehensively analyze the shaping gain achieved by the correlation of the input sequences, and show that the use of a pulse shape, which convolves the sequence destructively, is capable of increasing the achievable information rate of the system.

关键词： Pulse modulation Pulse shaping methods Constellation diagram Matched filters modulation coding Phase shift keying Intersymbol interference Information analysis Source coding Binary phase shift keying

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Contrasting Open-Loop and Closed-Loop Power Control Performance in UTRAN LTE Uplink by UE Trace Analysis

Contrasting Open-Loop and Closed-Loop Power Control Performa...

引用

IEEE International Conference on Communications (ICC)

作者： R. Mullner C. F. Ball K. Ivanov J. Lienhart P. Hric Radio Access Nokia Siemens Networks GmbH and Company KG Munich Germany Siemens AG Vienna Austria

Uplink power control in UTRAN Long Term Evolution consists of an open-loop scheme handled by the User Equipment and closed-loop power corrections determined and signaled by the network. In this study the difference in performance between pure open-loop and combined open and closed-loop power control has been analyzed and the different behavior of fractional vs. full path-loss compensation has been evaluated. A comprehensive system level simulation model has been used with a facility to trace a particular test user during its motion from eNodeB towards the cell border and back to its initial position. This study demonstrates the effect of distance path-loss of a test user on several physical layer performance metrics including throughput, resource allocation as well as modulation and coding scheme utilization. Simulation results in a fully loaded network show high throughput for open-loop fractional power control for the user located in the vicinity of the serving eNodeB, however, steep performance degradation has been observed when the user is moving towards the cell edge. The user throughput at the cell border can be increased by the closed-loop component. The benefit of closed-loop power control is the higher homogeneity in terms of throughput across the entire network area and the ability to automatically stabilize the network performance under different conditions like cell load and traffic distribution.

关键词： Power control Performance analysis Throughput Long Term Evolution Power system modeling System testing Physical layer Measurement Resource management modulation coding

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