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检索条件"主题词=Modulation Coding"

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A 5.8 GHz transmitter MMIC for electronic toll collection system

A 5.8 GHz transmitter MMIC for electronic toll collection sy...

引用

Annual IEEE Symposium on Gallium Arsenide Integrated Circuit (GaAs IC)

作者： Zhongmin Wen T. Katayanagi Y. Arai H.I. Fujishiro S. Seki Semiconductor Technology Laboratory R & D Group Oki Electric Industry Company Limited Hachioji Tokyo Japan

The results on the design and the measurement of a 5.8 GHz GaAs transmitter MMIC for electronic toll collection (ETC) system on-board equipment are presented. The MMIC of single chip and single supply without any external element is assembled into a 16-pin SSOP package. A novel drain-controlling modulation circuit is invented as a modulator to provide linear modulation. The measured adjacent channel power (ACP) is lower than -47 dBc. The on/off ratio of modulation is above 40 dB at 5.8 GHz under a random data modulation of 1.024 Mbps with Manchester coding.

关键词： Transmitters MMICs Semiconductor device measurement modulation coding Gallium arsenide Assembly Electronics packaging Packaging machines Circuits Power measurement

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A high efficiency channel estimation and equalisation strategy for a broadband COFDM system

A high efficiency channel estimation and equalisation strate...

引用

URSI International Symposium on Signals, Systems, and Electronics (ISSSE)

作者： R.F. Ormondroyd E.A. Al-Susa Communications and Wireless Networks Research Group Cranfield University Swindon UK Department of Electronic and Electrical Engineering University of Bath Bath UK

COFDM is a channel coding and modulation scheme that mitigates the adverse effects of time-varying, frequency-selective fading by using multi-carrier modulation combined with time- and frequency-domain interleaving and forward error correcting coding (FEC). COFDM effectively transforms the time-domain equalisation problem of conventional single carrier systems into the frequency domain. This paper examines the performance of an efficient feedback channel estimation and equalisation algorithm for a 25 Mb/s COFDM-QAM system in a frequency-selective multipath channel. In particular, the effect of the COFDM block length relative to the coherence time of the channel is discussed.

关键词： Channel estimation modulation coding Channel coding Fading Interleaved codes Error correction Forward error correction Time domain analysis Frequency domain analysis Feedback

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Performance of the non-coherent DLL in multiple access interference

Performance of the non-coherent DLL in multiple access inter...

引用

IEEE International Symposium on Spread Spectrum Techniques and Applications

作者： J. Caffery G.L. Stuber School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA

The performance of a non-coherent delay-locked loop (DLL) in the presence of multiple-access interference (MAI) is presented. The effect of the MAI on performance is evaluated in terms of two performance criteria: the mean-time-to-loss-lock (MTLL) and the root-mean-square (rms) tracking error. It is shown that the performance of the non-coherent DLL is drastically effected as the number of users in a system is increased. The effect of the near-far ratio, PN code sequence length, and loop signal-to-noise ratio (SNR) on the DLL's performance in MAI are also examined.

关键词： Multiple access interference Tracking loops Multiaccess communication Signal to noise ratio modulation coding Gaussian noise Delay estimation Spread spectrum communication Statistical analysis Performance analysis

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Fading-resistant transmission using built-in time diversity and several antennas

Fading-resistant transmission using built-in time diversity ...

引用

International Symposium on Telecommunications

作者： G.A. De Silva F.M. De Assis M.S. Alencar Escola Tecnica Fed. do Rio Grande do Norte Brazil Universidade Federal da Paraíba Brazil

Transmission over mobile fading channels requires some diversity scheme to obtain better error rates. The objective of this paper is to present systems that combine coded modulation with built-in time diversity, an optimized constellation and multiple transmission antennas. The transmission systems are simulated over fast-fading channels that present Doppler effects. A gain of 12 dB is attained in comparison with other proposed systems.

关键词： Transmitting antennas Fading Delay Multidimensional systems modulation coding Mobile communication Space stations Signal to noise ratio Antenna measurements Antenna accessories

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Performance analysis of the effects of time delay spread on trellis code modulation

Performance analysis of the effects of time delay spread on ...

引用

International Conference on Universal Personal Communications

作者： P. Fan K.B. Letaief R.D. Murch Center for Wireless Information Technology Electrical & Electronic Engineering Department Hong Kong University of Science and Technology Kowloon Hong Kong China

Time delay spread is an impairment which can seriously degrade the performance of wireless personal communication systems. This paper investigates the effects of time delay spread on unequalized trellis coded modulation (TCM) in multipath fading channels. Explicit bounds for the pairwise error probability (PEP) of TCM over such channels are derived and then used to evaluate TCM performance as well as investigate the delay spread tolerance limit of TCM, including I-Q TCM.

关键词： Performance analysis Delay effects Convolutional codes modulation coding Fading Frequency Dispersion Upper bound Analytical models Information technology

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DPCM with a recurrent neural network predictor for image compression

DPCM with a recurrent neural network predictor for image com...

引用

International Joint Conference on Neural Networks (IJCNN)

作者： Dong-Chul Park Tae-Hoon Park School of Electrical and Electronic Engineering MyongJi University South Korea

ISBN: (纸本)0780348591

A new predictor for DPCM based on a recurrent neural network is proposed. The proposed predictor which uses the bilinear recurrent neural network (BLRNN), has shown good performance for time-series prediction problems, and it is applied to DPCM for image compression with predictive coding. The performance of DPCM with BLRNN predictor is compared with the conventional DPCM with different predictors, such as the linear predictor and median predictor. The results show that the proposed method gives improved results over the conventional DPCM with linear predictor or median predictor in terms of PSNR or reconstructed images.

关键词： Recurrent neural networks Image coding Pulse modulation Pixel Neural networks Image reconstruction modulation coding Decoding Neurons Predictive coding

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In-service link quality estimation for link adaptation algorithms, applied to GSM

In-service link quality estimation for link adaptation algor...

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International Conference on Universal Personal Communications

作者： J. Pons J. Dunlop Department of Electronic and Electrical Engineering University of Strathclyde Glasgow UK

This paper investigates link quality estimates for GSM, in order to use them as an input for link adaptation algorithms. Two channel heuristics are extracted from the GSM transmission chain. Their suitability as triggering criteria is assessed by mapping them onto a bit error rate estimate. Then a real bit error rate characterisation is outlined, and the prediction error obtained is compared to the prediction error observed for the bit error rate estimates extracted from the heuristics. Results show that the accuracy of these estimates is similar to what could be achieved if real bit error rate measurements were available, being suitable for application to link adaptation algorithms.

关键词： GSM Bit error rate Interchannel interference Data mining Adaptive algorithm Speech enhancement Time division multiple access Robustness Decoding modulation coding

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VLSI chaotic pulse coded modulator using neural type cells

VLSI chaotic pulse coded modulator using neural type cells

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： L. Sellami M.E. Zaghloul R.W. Newcomb Electrical Engineering Department U.S. Naval Academy Annapolis MD USA Electrical Engineering Department University of Maryland College Park MD USA Electrical Engineering and Computer Science Department George Washington University Washington D.C. DC USA

A means of modulating information signals in both additive and multiplicative ways by chaotic signals is considered. The chaotic signals are obtained from neural type cells set to their chaotic oscillation mode. The information containing signals are modulated by these chaotic signals by introducing each as the input to a differential pair.

关键词： Pulse modulation Very large scale integration Chaos modulation coding Chaotic communication Circuits Voltage Neurons Hysteresis Resistors

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Maximum likelihood and multistage decoding for optimised multilevel coded modulation

Maximum likelihood and multistage decoding for optimised mul...

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IEEE (first ITW conference of the year) Information Theory Workshop (ITW)

作者： A.G. Burr Department of Electronics University of York York UK

We consider maximum likelihood trellis decoding of multilevel coded modulation optimised for finite BER. We introduce a class of optimised block coded modulation (BCM) schemes for 8-PSK with a very simple trellis deco... 详细信息

关键词： Maximum likelihood decoding modulation coding Bit error rate Iterative decoding Euclidean distance Binary codes Hamming distance Error probability Maximum likelihood estimation Turbo codes

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Recent advances in joint source-channel coding of video

Recent advances in joint source-channel coding of video

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URSI International Symposium on Signals, Systems, and Electronics (ISSSE)

作者： M. Bystrom J.W. Modestino ECE Department Drexel University Philadelphia PA USA

It has previously been shown that for an image or video transmission scheme to be both efficient and robust in practice that a joint source-channel coding approach is necessary. In this work, we discuss efforts in the field of joint source-channel coding of images and video. We then present a general methodology for determining the optimal tradeoff between source and channel coding as a function of channel characteristics for transmission of video. Further reduction in the computational complexity of this methodology through the use of models is discussed. Results of the optimal rate allocation procedure are presented for selected source and channel coding schemes and as a function of channel parameters.

关键词： Channel coding Image coding Source coding Character generation Robustness Video compression Signal design modulation coding Bit rate Forward error correction

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