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检索条件"主题词=modulation coding"

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CDMA receiver performance for multiple-input multiple-output antenna systems

CDMA receiver performance for multiple-input multiple-output...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： M. Ahmed J. Pautler K. Rohani Motorola Research Laboratories Fort Worth TX USA

We consider the performance of a forward link (base-to-mobile) shared channel with and without a multiple-input multiple-output (MIMO) antenna system. A CDMA shared channel is analyzed and simulated for which users are served in a time division multiplexed (TDM) manner. The slot structure and chip rate are based on the wideband CDMA standard. Link-level simulations are presented to compare the performances of two different receivers: linear minimum mean-square-error (MMSE), and nonlinear (turbo/iterative) MMSE. In addition, MIMO performance is compared with and without antenna array weight feedback.

关键词： Multiaccess communication MIMO Receiving antennas Transmitters Transmitting antennas Time division multiplexing Antenna arrays Feedback modulation coding Baseband

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Resource Consumption in Dynamic Spectrum Access Networks: Applications and Shannon Limits

Resource Consumption in Dynamic Spectrum Access Networks: Ap...

引用

Information Theory and Applications Workshop, ITA

作者： Michael B. Pursley Thomas C. Royster Clemson University USA

When a frequency band has been selected for a session in a dynamic spectrum access network, the initial choices for the modulation and coding must be consistent with the bandwidth that is available and the session's quality-of-service priorities. A measure of resource consumption is developed for use in the selection of the code-modulation combination. The resource- consumption metric accounts for the bandwidth, data- transmission time, and transmitted power for the session. Shannon capacity limits are employed to bound the resource consumption and permit tradeoffs between the time-bandwidth product of the signals and the amount of power that must be transmitted to achieve reliable communication.

关键词： Pulse modulation Frequency Quadrature amplitude modulation Access protocols modulation coding Bandwidth Product codes Biorthogonal modulation Interleaved codes Quality of service

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A novel adaptive predictor DPCM system for speech signals

A novel adaptive predictor DPCM system for speech signals

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

作者： T. Eger L. Varner Analytic Sciences Corporation Mclean VA USA

A novel Adaptive Predictor Differential Pulse Code modulation (DPCM) technique has been developed in which the predictor, rather than the quantizer, is adapted. The z-plane pole locations are adjusted on a sample-by-sample basis, tuning the predictor to track the instantaneous frequency of the input speech waveform. The adaptive algorithm employs a simple estimate of the correlation coefficient of the input signal, based upon the three previous samples. The system has been proven operable at bit rates as low as 8 kbs, resulting in improved performance over more conventional DPCM systems. Robust performance has been obtained with bauded data signals as well as speech signals with input SNRs as low as 0 dB, and under conditions of crosstalk as high as 0 dB relative to input speech.

关键词： Adaptive systems Speech Pulse modulation modulation coding Tuning Frequency Adaptive algorithm Bit rate Knowledge based systems Robustness

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Iterative SOMA-Based SU-MIMO Receivers with Extrinsic-Information Adaptive Front-Ends

Iterative SOMA-Based SU-MIMO Receivers with Extrinsic-Inform...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Haralabos C. Papadopoulos Ming-Yang Chen Sean A. Ramprashad Carl-Erik W. Sundberg DoCoMo Communications Laboratory USA Inc. Palo Alto CA USA

ISBN: (纸本)9781424425143

In this paper we present reduced-complexity high-performance iterative receivers for single-user MIMO systems that employ OFDM with bit-interleaved coded modulation. The proposed inner-outer decoder structures exploit the Soft-Output M algorithm (SOMA) to calculate bit-likelihood estimates via a limited search on a tree. A key element of the proposed designs is the way the SOMA front-end adapts at each iteration to new extrinsic information. This front-end defines the tree, both in terms of the order in which symbols are considered, as well as in terms of the subspaces used in the likelihood calculations at each depth in the tree. The proposed SOMA front-ends are different from the conventional QR-decomposition front-ends and provide a systematic way to adapt both the order and the subspaces at each iteration in an iterative decoding structure. Simulations for 4 × 4 16 QAM systems show that the proposed iterative receivers can yield significant performance gains over receivers using non-adaptive conventional front-ends.

关键词： MIMO Receiving antennas Iterative decoding Quadrature amplitude modulation Transmitting antennas Interleaved codes modulation coding OFDM modulation Modems Radio transmitters

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Variable block-size double predictor DPCM (VBDP-DPCM) image transmission system over wireless fading channel

Variable block-size double predictor DPCM (VBDP-DPCM) image ...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Jia-Chyi Wu N.H.C. Chung Department of Communication and Guidance Engineering National Taiwan Ocean University Keelung Taiwan Division of Research and Development MTI Corporation Hsinchu Taiwan

A variable blocksize double predictor differential pulse code modulation (VBDP-DPCM) image coding algorithm is utilized for image transmission over Rayleigh fading channels. Quadtree segmentation algorithm is applied to divide a given digital image into segments of variable size, square blocks, in which the nonstationary statistical characteristics of the given image source can be better exploited. Each variable blocksize sub-image is then applied the double predictor DPCM (DP-DPCM) coding scheme to further reduce the quantization error and produce a better data compression ratio than that of a DPCM scheme. To improve the system performance for transmitting VBDP-DPCM encoded images over wireless fading channel, we have adopted the quadrature phase shift keying (QPSK) modulation as well as a channel coding algorithm in this study. The convolutional encoder and maximum-likelihood Viterbi hard decision decoder are applied to protect the transmitted source data and to reduce bit error rate (BER) in fading channel. Performance of this VBDP-DPCM image transmission system over Rayleigh fading channel is evaluated in this research.

关键词： Image communication Fading Pulse modulation modulation coding Image segmentation Quadrature phase shift keying Bit error rate Image coding Digital images Quantization

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The Intel/spl reg/ PXA800F wireless Internet-on-a-chip architecture and design

The Intel/spl reg/ PXA800F wireless Internet-on-a-chip archi...

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Custom Integrated Circuits Conference (CICC)

作者： D. Krishnaswamy R. Stevens R. Hasbun J. Revilla C. Hagan Wireles Communications and Computing Group Intel Corporation Folsom CA USA

The Intel/spl reg/ PXA800F cellular processor is the first product in the wireless industry to integrate a DSP processor core, a high performance applications processor core, baseband communication logic, with flash and SRAM memories, all on one chip. It is a revolutionary system-on-chip (SOC) product in the cellular industry with dedicated access to integrated memories by both processor cores and which delivers industry-leading performance. This paper presents the key innovative architectural features and the key SOC design and validation issues associated with the design of this product, with preliminary results on system-level performance.

关键词： Internet GSM Baseband Random access memory Frequency Communication standards Time division multiple access Ground penetrating radar modulation coding Computer architecture

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Cross-layer optimization of hybrid satellite network over the Amazonian region

Cross-layer optimization of hybrid satellite network over th...

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International Workshop on Satellite and Space Communications (IWSSC)

作者： Jose Radzik Oriol Vidal David Pradas Maria Angeles Vazquez Castro S.C.A.N Group ISAE Université de Toulouse Toulouse France Department of Telecommunications and Systems Engineering Universidad Autonoma de Barcelona Barcelona Spain

Tabatinga is a SATNEX initiative aimed at defining and designing a DVB-S2/RCS WiMAX system to provide access network services over the Amazonian region of Brazil at Ku band. This paper summarizes the work done on the ... 详细信息

关键词： Digital video broadcasting Satellite broadcasting WiMAX Access protocols Physical layer IP networks Telecommunication services Streaming media modulation coding Asynchronous transfer mode

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Performance Trade-Off Investigation of B-IFDMA

Performance Trade-Off Investigation of B-IFDMA

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Johnny Karout Leela Srikar Muppirisetty Tommy Svensson Communication Systems Group Department of Signals and Systems Chalmers University of Technology Gothenburg Sweden

ISBN: (纸本)9781424425143

A performance trade-off investigation is carried out between different possible uplink multiple access schemes, that are based on Orthogonal Frequency Division Multiplexing (OFDM), for International Mobile Telecommunication (IMT) Advanced systems. Between the Discrete Fourier Transform (DFT) preceded systems with different subcarrier allocation mappings and systems lacking DFT-precoders, Block Interleaved Frequency Division Multiple Access (B-IFDMA) is shown to provide a good trade-off between the frequency diversity collected, envelope properties achieved, and channel estimation performance compared to the other mapping schemes. The schemes are analyzed in the presence of the different possible modules which include equalizers, modulators, interleavers, and channel codes. In particular, robust codes such as Turbo codes are able to collect the diversity provided by such schemes, and B-IFDMA systems is shown to be able to beat the other systems in bit error rate (BER) performance terms.

关键词： OFDM Discrete Fourier transforms Bit error rate Frequency conversion Frequency diversity Channel estimation Equalizers modulation coding Robustness Turbo codes

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A serial Unequal Error Protection Code system using multilevel Trellis Coded modulation with two ring signal constellations for AWGN channels

A serial Unequal Error Protection Code system using multilev...

引用

IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS)

作者： Satoshi Yamazaki David K. Asano Department of Mathematics and System Development Graduate School Shinshu University Nagano Nagano Japan Department of Information Engineering Shinshu University Nagano Nagano Japan

A serial unequal error protection (UEP) code system for use with information sources that contain a mixture of both important and less important data is proposed. To achieve UEP, the proposed scheme uses a form of trellis coded modulation (TCM) which encodes the data by switching between two codes that use different signal constellations. The proposed system uses two ring signal constellations (2RING). No extra information about which code was used is added. The receiver decides which code was used by examining the received signal points. In this paper, a theoretical analysis of the 2RING signal constellation is presented, and the effectiveness of the system for AWGN channels is shown using computer simulations.

关键词： Error correction codes modulation coding Constellation diagram AWGN channels Asynchronous transfer mode Switches Communication systems Data engineering Signal analysis Computer simulation

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Status of Industry Efforts to Deploy EDC and Advanced modulation Schemes for Extended Reach Transport Applications

Status of Industry Efforts to Deploy EDC and Advanced Modula...

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Optical Fiber Communication (OFC) Conference

作者： Y. Chang Transport Systems Engineering Vitesse Semiconductor Corporation Camarillo CA USA

The current status of industrial efforts to standardize interoperable optical interfaces applied to transmitters and receivers is reviewed with particular emphasis on the application of EDC and advanced modulation sch... 详细信息

ISBN: (纸本)9781557528568

关键词： Optical transmitters Optical receivers Optical modulation Stimulated emission Costs CMOS technology Chirp modulation Brillouin scattering Communication industry modulation coding

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