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检索条件"主题词=modulation coding"

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Linear PCM signal processing for audio processing unit in multipoint video conferencing system

Linear PCM signal processing for audio processing unit in mu...

引用

IEEE Symposium on Computers and Communications (ISCC)

作者： Kyeong-Yeol Yu Jong-Hoon Park Jong-Hyeong Lee Network Architecture Section Electronics and Telecommunications Research Institute South Korea

This paper describes the architecture and functions of the audio processing unit (APU) which deals with linear pulse code modulation (PCM) audio signals in the multipoint control unit (MCU), that used for a multipoint video conferencing system. The MCU receives audiovisual data from the subscriber, carries out video merging and audio mixing, and distributes the data to them. It also performs session setup, tear down, and control of the conference. The audio processing unit consists of a local processor and peripheral memories, a VME bus control block, a current speaker detection block, and an audio-mixing block. The current speaker detection block determines the channel of the current speaker by comparing the mean power of each channel. A mixing block mixes linear PCM audio data using speaker information and, performs echo cancellation. We propose another speaker detection algorithm using the scale factor of the MPEG-1 audio elementary stream. In simulation, it showed a similar result in speaker detection with that of linear PCM audio.

关键词： Phase change materials Signal processing Pulse modulation Videoconference Video signal processing modulation coding Control systems Merging Echo cancellers Detection algorithms

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Real time low bit-rate video coding algorithm using multi-stage hierarchical vector quantization

Real time low bit-rate video coding algorithm using multi-st...

引用

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

作者： K. Terada M. Takeuchi K. Tamaru Kyoto Daigaku Kyoto JP

We propose a low bit-rate coding algorithm for wireless communication based on multi-stage hierarchical vector quantization, motion compensation and differential pulse code modulation. Our method adapts bit allocation to spatial and temporal correlation. Conventional schemes based on the discrete cosine transform (DCT) need a large amount of computation on both encoding and decoding. On the other hand, our proposed method consists of addition, subtraction and shift operation. It does not use multiplication. It can decode in real time on a conventional serial processor. Encoding by vector quantization (VQ), however, consumes a large amount of computation. We developed a new LSI to accelerate VQ. Our scheme can send 10 frames of QCIF video sequences through a 29.2 kbps line. The quality of reconstructed image is over 30 dB.

关键词： Video coding Vector quantization Pulse modulation Discrete cosine transforms Encoding Decoding Wireless communication Motion compensation modulation coding Bit rate

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Performance of COFDM for LEO satellite channels in global mobile communications

Performance of COFDM for LEO satellite channels in global mo...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： W.A.C. Fernando R.M.A.P. Rajatheva Telecommunications program SAT Asian Institute of Technology Klong Luang Pathum Thani Thailand

The growing interest in orthogonal frequency division multiplexing (OFDM) research motivated us to propose OFDM for satellite communications. In this paper, convolutional coding (CC) and trellis coded modulation (TCM) are combined with OFDM for a Rician fading channel according to the specifications given by the Iridium system. Here, the bit error rate (BER) performance of OFDM with 8-PSK and 16-QAM modulation techniques along with two different coding schemes are considered for a LEO satellite channel. Results are analyzed with two frequency bands, i.e. Ka and L band. Results show that there is no significant difference of the BER performance between the two frequency bands considered. Trellis coded OFDM gives the best performance compared to convolutional coded OFDM. The peak to average power ratio (PAPR) can be reduced approximately by 1.5 dB with the help of the partial transmit sequence technique (PTS).

关键词： Low earth orbit satellites Artificial satellites Mobile communication Convolutional codes OFDM modulation Convolution modulation coding Transmitters Signal mapping Satellite broadcasting

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Fixed point error analysis of multiuser detection and synchronization algorithms for CDMA communication systems

Fixed point error analysis of multiuser detection and synchr...

引用

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

作者： C. Sengupta S. Das J.R. Cavallaro B. Aazhang Electrical and Computer Engineering Rice University Houston TX USA

Conventional correlation based single-user techniques for direct sequence code division multiple access (DS-CDMA) wireless communication systems are susceptible to performance degradation due to interference from other users. Previous research has focused on development of several multiuser techniques where information about multiple users is used to improve performance for each individual user. Due to performance benefits of these methods, they are attractive candidates for implementation in future cellular systems. In this paper we present an error analysis of fixed point implementation of some of these techniques.

关键词： Error analysis Multiuser detection Multiaccess communication Frequency synchronization modulation coding Hardware Degradation Base stations Delay Timing

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Adaptive signaling for multimedia transmission in CDMA cellular radio systems

Adaptive signaling for multimedia transmission in CDMA cellu...

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MILCOM, Military Communications Conference

作者： M.B. Pursley J.M. Shea Department of Electrical and Computer Engineering Clemson University Clemson SC USA

We have previously introduced modulation and coding schemes that permit the simultaneous reception of a basic message stream by receivers with a wide range of capabilities and an additional message stream by more capable receivers. In a tactical military application, the basic message may represent a voice message, while the additional message may correspond to a digitized image. We investigate adaptive modulation and coding techniques based on our previous schemes, and we apply the adaptive techniques to a cellular communication system that employs direct-sequence spread-spectrum multiple access, also known as code-division multiple access (CDMA). In a cellular CDMA system each mobile terminal experiences variations in both the received signal strength and the interference. We show that by adapting the parameters of the modulation and coding to the signal-to-interference ratio, the throughput can be increased for the additional message while maintaining an acceptable error rate for the basic message.

关键词： Multimedia systems Multiaccess communication Land mobile radio cellular systems modulation coding Interference Telephone sets Base stations Receivers Streaming media Spread spectrum communication

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On the performance of interleaved convolutional codes and the comparison with BCH codes in different mobile channels

On the performance of interleaved convolutional codes and th...

引用

IEEE Region 10 International Conference TENCON

作者： Yuan Dongfeng Luo Jijun Maning Electronic Engineering Department Shandong University Jinan Shandong China

The 3-state and 4-state Markov models are proposed as the long-bursting error possibility models of mobile channels. The coding and decoding of simple convolutional codes and the method of interleaving are combined. The error-correcting performance of interleaved convolutional codes in nine different channels with different modulation styles, vehicle speeds, and different information transmitting rates is simulated and researched. In addition, the above is compared with former research work on BCH codes and analyzed. Some significant conclusions are obtained.

关键词： Convolutional codes Decoding Interleaved codes modulation coding Vehicles Computer errors Electronic mail Frequency shift keying Error correction codes Computer simulation

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The application of code division multiple access for transport overhead information in transparent optical networks

The application of code division multiple access for transpo...

引用

Optical Fiber Communication (OFC) Conference

作者： L. Giehmann A. Gladisch N. Hanik J. Rudolph O. Ziemann Technologiezentrum Deutsche Telekom AG Berlin Germany Technische Universitat Ilmenau Germany

ISBN: (纸本)1557525293

Summary form only given. The operation, administration, and maintenance (OAM) of a transport network require the generation, transmission, and detection of OAM signals that are related to each network layer. In the modelled system Gold codes have been applied for transport of the OAM-signals at channels, which have been modulated externally (by Mach-Zehnder modulators) at different modulation levels in order to characterize the influence of the modulation depth. The simulation has shown the feasibility of CDMA for transport of OAM-signals with a bandwidth up to l0-kbit/s per optical carrier in transparent optical networks with minimised distortion of the high speed data stream.

关键词： Multiaccess communication modulation coding Optical distortion Optical fiber networks Signal generators Signal detection Gold Bandwidth High speed optical techniques Optical modulation

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Concatenated coding for packet transmission over the collision channel

Concatenated coding for packet transmission over the collisi...

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IEEE International Symposium on Information Theory

作者： G. Caire E. Leonardi E. Viterbo Dipartimento di Elettronica Politecnico of Torino Torino Italy AT and T Research Laboratories Florham Park NJ USA

We consider a collision channel (Massey and Mathys 1985) with additive white Gaussian noise (AWGN) and slow fading. We assume that data on a collided slot are completely lost. Caire et al. (1998) proposed a combination of signal-space coding and slow time-frequency hopping for this channel. Code vectors (or equivalently, signals) are points in a D-dimensional real Euclidean space. The main idea is that, under certain conditions on the signal-space code and provided that signal points are transmitted so that their D components belong to different time-frequency slots, even if k

关键词： Concatenated codes Delay Decoding Interleaved codes Error probability AWGN Time frequency analysis modulation coding Error analysis Additive noise

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A 2D DPCM scheme using cellular neural networks

A 2D DPCM scheme using cellular neural networks

引用

IEEE International Workshop on Cellular Nanoscale Networks and their Applications, (CNNA)

作者： M.E. Celebi C. Guzelis Electronics and Communication Engineering Department İstanbul Technical University Maslak Istanbul Turkey

We formulate differential pulse code modulation (DPCM) for image compression as the minimization of a quadratic cost function. Non-causal interpolation error image in lieu of causal prediction error image can be coded in this fashion providing efficient compression. We implement the optimization process through the dynamics of cellular neural networks (CNNs). Two CNNs, one of them operated in binary mode and the other in gray level mode, are used in the coding stage. The first CNN creates an optimum differential image while the other tries to create a replica of the reconstructed image of the receiver. Decoding is realized by another gray level mode CNN fed by the differential image.

关键词： Cellular neural networks Image coding Pulse modulation Cost function Lyapunov method Image processing Steady-state Pulse compression methods modulation coding Symmetric matrices

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Decision feedback for IS-95 CDMA uplink in multipath and Rayleigh fading

Decision feedback for IS-95 CDMA uplink in multipath and Ray...

引用

IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： P.U. Volz M.E. Magana Department of Electrical and Computer Engineering Oregon State University Corvallis OR USA

A decision feedback receiver/decoder for IS-95 CDMA uplink in multipath and Rayleigh fading is presented. The receiver/decoder design shows a consistently better performance than conventional receivers that use the sa... 详细信息

关键词： Feedback Multiaccess communication Rayleigh channels Convolutional codes Convolution Decoding modulation coding Personal communication networks Quadrature phase shift keying Viterbi algorithm

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