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检索条件"主题词=modulation coding"

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Iterative differential PSK demodulation and channel decoding

Iterative differential PSK demodulation and channel decoding

引用

IEEE International Symposium on Information Theory

作者： P. Hoeher J. Lodge German Aerospace Center Oberpfaffenhofen Germany Communications Research Centre Ottawa ONT Canada

A type of serial "turbo code" is investigated, where a differential encoder (e.g., a DPSK modulator) is concatenated with a convolutional code, separated by interleaving. On fading channels, "turbo-DPSK" has the (perhaps surprising) potential to slightly outperform the performance of coded coherent PSK without differential encoding and perfect channel estimation.

关键词： Phase shift keying Demodulation Iterative decoding Differential quadrature phase shift keying modulation coding Concatenated codes Convolutional codes Interleaved codes Fading Channel estimation

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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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On efficiency of link adaptation mechanisms in H/ARQ systems

On efficiency of link adaptation mechanisms in H/ARQ systems

引用

Proceedings of the International Convention MIPRO

作者： Milos Pilipovic Dragan Samardzija Computing and Control Department University of Novi Sad Novi Sad Serbia

In this study we analyze the synergy effects among ARQ and Hybrid ARQ with rate-adaptive mechanisms. We present several coding and decoding schemes and link adaptation techniques for rate-adaptive transmission, designed to combat noise, and we discuss their performance. We describe approaches for searching and selecting the best modulation and coding scheme (MCS) based on channel quality information (CQI). Hybrid ARQ using convolutional and punctured convolutional codes is used with variable re-transmission packet size and code rate according to CQI. Attractive simulation results are issued and they may be used as a basis for performance trade-off.

关键词： Automatic repeat request Decoding Convolutional codes Quality of service Bit error rate AWGN modulation coding Error correction Cyclic redundancy check Forward error correction

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

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

引用

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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Efficient methods for symbol synchronization and AMC mode selection in OFDM systems

Efficient methods for symbol synchronization and AMC mode se...

引用

International Conference on Advanced Technologies for Communications, ATC

作者： Seong Jin Park Sung Ho Cho Min Soo Kang Division of Electrical & Computer Engineering Hanyang University Seoul South Korea Division of Information & Communication Engineering Hanyang Cyber University Seoul South Korea

This paper presents a symbol synchronization algorithm in the multi-mode orthogonal frequency division multiplexing (OFDM) systems. Efficient system reconfiguration algorithm applying to the adaptive modulation and coding (AMC) method is also presented. The algorithm for the symbol synchronization uses the shorter repetition period for computing correlation values than existing methods. It can reduce the computational complexity and the estimation delay time. We confirm the performance of the algorithm by using the baseband platform equipped with TMS320C6416 DSP chip. After the synchronization process, we propose the efficient AMC method that use throughput based on the channel characteristic. It changes the modulation process and coding rate dynamically. We measure the throughput of the AMC applied to the system reconfiguration algorithm.

关键词： Frequency synchronization modulation coding Delay estimation Throughput OFDM modulation Computational complexity Delay effects Baseband Digital signal processing chips Semiconductor device measurement

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Computational cutoff rate of an input runlength-limited BSC

Computational cutoff rate of an input runlength-limited BSC

引用

IEEE International Conference on Communications (ICC)

作者： Shih-Hsuan Yang National Taipei Institute of Technology Taiwan

Runlength-limited (RLL) codes are widely used in digital recording systems. A new lower bound for the computational cutoff rate of a binary symmetric channel having an input runlength-limited constraint is derived. The derivation is based on a random coding argument together with generating function techniques. Our result outperforms the existing lower hound.

关键词： Decoding Upper bound Interference constraints modulation coding Error probability Channel capacity

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Comparative evaluation of the performance of anti-multipath modulation techniques for digital mobile radio systems

Comparative evaluation of the performance of anti-multipath ...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： K.S. Ju U.S. Goni A.M.D. Turkmani Department of Electrical Engineering and Electronics University of Liverpool Liverpool UK Mobile Systems International London UK

A comparative evaluation of the performance of Manchester coded PSK (MC-PSK), phase shift keying return to zero (PSK-RZ) and phase shift keying varied phase (PSK-VP) anti-multipath modulation techniques is presented. A two-ray propagation channel model using various delay spread values has been employed. The effect of spectral shaping of the transmitted signal on the BER performance of each of these modulation schemes, using Butterworth lowpass and square-root raised cosine premodulation filters, is investigated. The BER performance results obtained using these modulation techniques are compared with that of differential phase-shift keying (DPSK) modulation. It is shown that for a frequency non-selective fading channel, the performance of the anti-multipath modulation schemes is comparable to that of simple DPSK. However as the channel becomes frequency selective, the performance of the anti-multipath modulation systems improves beyond that provided by the DPSK system.< >

关键词： Phase shift keying Phase modulation Differential quadrature phase shift keying Bit error rate Frequency modulation coding Propagation delay Filters Differential phase shift keying Fading

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Power minimization algorithm for high-speed access over copper: Multichannel approach

Power minimization algorithm for high-speed access over copp...

引用

IEEE Pacific Rim Conference on Communications, Computers and Signal Processing

作者： Ali Enteshari Mohsen Kavehrad Center of Information and Communications Technology Research Pennsylvania State University University Park PA USA

ISBN: (纸本)9781424445608

We present an algorithm to reduce the power consumption of single-carrier data transmission over twisted-pair copper cables for future IEEE networking physical connectivity standard, 40GBASE-T. High-complexity coding schemes employed for multi-gigabits transmission systems for higher reliability, e.g., system margin, is one of the major sources of power dissipation. The proposed method reduces the total power consumption by properly partitioning the channel into few sub-channels and using lower complexity coding schemes for the sub-channel with less insertion loss while the margin requirement is met over the entire channel.

关键词： Minimization methods Copper Data communication Communication cables Bandwidth Signal to noise ratio Energy consumption Insertion loss modulation coding Power system reliability

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Digital Audio Broadcasting receiver development

Digital Audio Broadcasting receiver development

引用

IBC 95 International Broadcasting Convention

作者： K. Yamauchi S. Kakiuchi A. Takebe M. Sugitomo Pioneer Electronic Corporation Japan

Digital Audio Broadcasting (DAB) was developed by the European Eureka-147 project. This system has many technical advantages of modulation coding (COFDM), error correction (Viterbi decoding) and source coding (MUSICAM). DAB is used for high speed data broadcasting to mobile vehicles and can provide CD quality audio programs and various data to drivers. The prototype DAB receiver is designed using multiple general purpose DSPs and consists of an RF part, OFDM decoder, Viterbi decoder and MUSICAM decoder. The DAB system is described and the first prototype DAB receiver is introduced. In addition, our first field testing in Toronto and DAB future possibilities are also described.< >

关键词： Digital audio broadcasting Frequency division multiplexing modulation coding Radio receivers Source coding Viterbi decoding

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