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检索条件"主题词=modulation coding"

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Space-time coding for MIMO kronecker channels

Space-time coding for MIMO kronecker channels

引用

International Conference on Electrical Engineering, Computing Science and Automatic Control (CCE)

作者： V.J. Rivera-Alvarez V.Ya. Kontorovitch Department of Electrical Engineering and Computer Sciences CINVESTAV-IPN Guadalajara Mexico Department of Electrical Engineering CINVESTAV-IPN San Pedro Zacatenco DF Mexico

Space-Time coding and MIMO wireless systems are two recent technological breakthroughs in modern communications. The promises of information theoretic MIMO analysis has ignited the study of related areas such as MIMO channel modeling, Space-Time coding, Space-Time signal processing, etc. One of the most popular models because of its simplicity is the Kronecker mode1. In this paper we analyze the Alamouti coding scheme and study the impact of antenna correlation for this scheme using BPSK modulation and a 2 x 2 MIMO channeI. The MIMO Kronecker model was used in the simulation for various spatial correlation factors and the associated Doppler shifts in each branch. The results in this paper are new in this context and have not been found elsewhere.

关键词： MIMO Receiving antennas Space technology Transmitting antennas Signal processing Information analysis Signal analysis modulation coding Fading Space time codes

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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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Performance of DS/GMSK/PSK modem using four-phase correlator

Performance of DS/GMSK/PSK modem using four-phase correlator

引用

IEEE International Symposium on Spread Spectrum Techniques and Applications

作者： Y. Yano H. Tachika T. Fujino Radio Communication Department Information Technology R & D Center Mitsubishi Electric Corporation Limited Kamakura Kanagawa Japan

Direct-sequence spread-spectrum (DS/SS) system has been extensively studied for land mobile communications because of the notable and attractive features such as its robustness and applicability to code division multiple access (CDMA). We propose a DS/SS modulation method which employs Gaussian-filtered minimum-shift-keying (GMSK) and permits simple code acquisition. The modulated signal can be demodulated by a four-phase correlator which can obtain the correlation value of the received signal even if a phase difference between the transmitter and the receiver exists. The bit error performance obtained by the hardware experiments ensures the validity of this modulation method.

关键词： Phase shift keying Modems Correlators Multiaccess communication Spread spectrum communication Mobile communication Robustness modulation coding Gaussian processes Phase modulation

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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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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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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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Optimal Operation of Ultrasonic Correlation Systems

Optimal Operation of Ultrasonic Correlation Systems

引用

IEEE Symposium (IUS) Ultrasonics

作者： E.S. Furgason School of Electrical Engineering Purdue University West Lafayette IN USA

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Teaching Rate Conversion using Hardware-Based DSP

Teaching Rate Conversion using Hardware-Based DSP

引用

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

作者： Thad B. Welch Cameron H. G. Wright Michael G. Morrow Department of Electrical Engineering U.S. Naval Academy MD USA Department of Electrical and Computer Engineering University of Wurzburg WY USA Department of Electrical and Computer Engineering University of Wisconsin Madison WI USA

To enable us to affordably teach software defined radio at the undergraduate level, we developed a low cost system that allows realistic hardware projects and demonstrations. This new board connects a Texas Instruments C67x DSP starter kit (DSK) to an analog devices AD9857 quadrature modulator. This modulator is capable of operating at up to 200 million samples per second (MS/s), with a carrier (or intermediate frequency) of up to 80 MHz. Baseband 14-bit in-phase and quadrature (I/Q) data are presented to the modulator, which can be programmed to interpolate the data at rates from 4x to 252x. The AD9857 is interfaced to the DSK using an Altera Cyclone FPGA which provides queuing of the I/Q data and the logic for control/programming of the modulator. This paper describes the associated hardware and software issues and briefly describes recommended classroom use.

关键词： Education Digital signal processing Hardware modulation coding Logic programming Software radio Costs Instruments Frequency Baseband

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High data rate (10 Gbit/sec) demonstration in holographic disk digital data storage system

High data rate (10 Gbit/sec) demonstration in holographic di...

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Conference on Lasers and Electro-Optics (CLEO)

作者： S.S. Orlov W. Phillips E. Bjornson L. Hesselink R. Okas Department of Electrical Engineering Stanford University Stanford CA USA

Summary from only given. In digital holographic data storage data modulation coding, data interleaving, and error correction are usually implemented in addition to conventional holography and multiplexing. The performance of the holographic disk digital data storage system is determined by several major factors, most notably, by the optical parameters (such as the imaging NA), material performance (dynamic range or M/#, scattering, and thickness), as well as available laser power.

关键词： Holography Data storage systems Holographic optical components Optical scattering Memory modulation coding Interleaved codes Error correction codes Optical modulation Optical imaging

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A study on quasi-synchronous CDMA based on selected PN signature sequences

A study on quasi-synchronous CDMA based on selected PN signa...

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IEEE International Symposium on Spread Spectrum Techniques and Applications

作者： S. Kuno T. Yamazato M. Katayama A. Ogawa Department of Information Electronics School of Engineering University of Nagoya Nagoya Japan

The performance of quasi-synchronous CDMA (QS-CDMA) system, which can allow an increased timing error in synchronized access, is discussed. The QS-sequences are selected from an M-sequence set or a Gold-sequence set considering the cross-correlation property, and the average BER is calculated for the system with QS-sequences. As a result, the average BER of the system with QS-sequences is improved considerably compared with asynchronous CDMA when the access timing error is within a few chip durations.< >

关键词： Multiaccess communication Timing Bit error rate Interchannel interference Code division multiplexing modulation coding Fading Degradation Base stations Additive white noise

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