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检索条件"主题词=modulation coding"

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Turbo coded modulation for systems with transmit and receive antenna diversity

Turbo coded modulation for systems with transmit and receive...

引用

Seamless Interconnection for Universal Services. Global Telecommunications Conference. GLOBECOM'99. (Cat. No.99CH37042)

作者： A. Stefanov T.M. Duman Telecommunications Research Center Electrical Engineering Department Arizona State University Tempe AZ USA

In a previous work Stefanov and Duman (see Proceedings of VTG-Fall, 1999) introduced turbo coded modulation for wireless communication systems with transmit and receive antenna diversity over block Rayleigh fading channels. We showed that a simple, arbitrarily picked, turbo coded modulation scheme using the 4-PSK constellation outperforms the space-time block and trellis codes significantly. In this paper we present further results on the use of turbo coded modulation for antenna diversity systems. In particular, we consider different constellation sizes and various spectral efficiencies. We observe very high gains over the corresponding space-time codes for large interleaver lengths, which is suitable for data communications. We also observe that, depending on the channel model, the turbo code block size can be chosen small enough to be suitable for speech applications, and still offer significant performance improvement in terms of frame error rates.

关键词： Turbo codes modulation coding Receiving antennas Wireless communication Fading Quadrature phase shift keying Convolutional codes Space time codes Data communication Speech coding

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Supplement multi-media services for ACeS

Supplement multi-media services for ACeS

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MILCOM, Military Communications Conference

作者： You-Yun Xu Wen-Tao Song Han-Wen Luo Department of Electronic Engineering Shanghai Jiaotong University Shanghai China

Asia Cellular Satellite System (ACeS) is a $900 million fully financed project that uses two A2100AX geo satellites manufactured by Lockheed Martin. The services of the original design are voice, data, fax and paging throughout Southeast Asia, China and India. In this paper, we present a supplementary design, which called ACeS Multi-media System (AMS), for the original ACeS to offer some more narrow-band multi-media services such as Internet, Intranet and ISDN services to mobile or fixed users thus to make it more competitive in the market. The paper discusses the system description, frame/burst formats of satellite transmission links, design of the combining scheme of turbo codes and QAM modulation etc. This system can also be modified for military communications.

关键词： Asia Multimedia systems Manufacturing Narrowband Web and internet services ISDN Military satellites Turbo codes Quadrature amplitude modulation modulation coding

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Transfer function bounds on performance of turbo codes for M-ary orthogonal signals

Transfer function bounds on performance of turbo codes for M...

引用

IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： T. Ohtsuki J.M. Kahn Department of Electrical Engineering Science University of Tokyo Noda Chiba Japan Department of Electrical Engineering and Computer Sciences University of California Berkeley CA USA

We obtain upper bounds on the bit-error rate (BER) for maximum-likelihood (ML) decoding of turbo codes constructed with uniform interleavers for M-ary orthogonal signals. We use transfer function bounding techniques to obtain the above bounds. Thus, the upper bounds result in the average bound over all interleavers of a given length. We apply the techniques to parallel concatenated coding (PCC) schemes where recursive convolutional codes are used as constituent codes. We present the average bounds on the BER of turbo codes with constraint length 3 for M-ary orthogonal signals on additive white Gaussian noise (AWGN) channels. We show that the performance advantage of turbo-coded 4-ary orthogonal signals over turbo-coded binary orthogonal signals is smaller than the performance advantage in the absence of coding, which is 3.0 dB.

关键词： Transfer functions Turbo codes Bit error rate Upper bound Maximum likelihood decoding Convolutional codes AWGN Computer simulation modulation coding Concatenated codes

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Efficient hierarchical broadcasting using multilevel codes

Efficient hierarchical broadcasting using multilevel codes

引用

Information Theory and Networking Workshop

作者： D.W. Schill Dong-Feng Yuan J.B. Huber Lehrstuhl für Nachrichtentechnik II Universität Erlangen Nurnberg Nurnberg Germany Shandong University Jinan China

Coded modulation schemes for hierarchical broadcasting employing multilevel coding (MLC) are considered for both, AWGN and flat Rayleigh fading channels. Design rules for signal constellations and codes are discussed.... 详细信息

关键词： Broadcasting AWGN Fading Signal to noise ratio Amplitude shift keying Time sharing computer systems Decoding Additive white noise Constellation diagram modulation coding

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Performance of turbo coded modulation schemes in frequency selective Rayleigh fading channels

Performance of turbo coded modulation schemes in frequency s...

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IEEE Conference on Vehicular Technology (VTC)

作者： Gi Ho Park Nguyen Hoang Ha A.D.S. Jayalath R.M.A. Rajatheva SAT Asian Institute of Technology Klong Luang Pathum Thani Thailand

This paper presents the performance of different turbo coded modulation schemes in a Rayleigh multipath-fading channel. The performances of spectrally efficient multilevel modulation schemes combined with binary turbo codes are first observed. The results of the above scheme are then compared with that of turbo coded trellis coded modulation scheme (T-TCM). Simulation results show that the binary turbo codes combined with multilevel modulation schemes perform well in Rayleigh fading channels compared to the performance of T-TCM.

关键词： Turbo codes Frequency modulation modulation coding Fading Equalizers Iterative decoding Bandwidth Iterative algorithms Bit error rate Intersymbol interference

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MAP equalization of space-time coded signals over frequency selective channels

MAP equalization of space-time coded signals over frequency ...

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IEEE Conference on Wireless Communications and Networking

作者： G. Bauch A.F. Naguib Institute for Communication Engineering (LNT) Munich University of Technology Munich Germany Information Sciences Research-Shannon Laboratory AT and T Research Laboratories Florham Park NJ USA

This paper addresses the problem of equalization space-time codes with transmit diversity. We derive a symbol-by-symbol MAP equalizer/decoder for space-time coded signals over frequency selective channels. We describe a turbo equalization/decoding scheme where the results of the decoding are fed back to the equalizer. Simulation results show an improved equalizer performance due to the feedback.

关键词： Frequency Transmitting antennas Receiving antennas Transmitters Space time codes Decoding Equalizers modulation coding Block codes Convolutional codes

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The effect and influence of the slotted pilot scheme on the mobile CDMA systems

The effect and influence of the slotted pilot scheme on the ...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： J. Nanyan W. Wenbo Y. Dacheng Beijing University of Posts and Telecommunications Beijing China

Phase-shift keying (PSK) is an attractive modulation scheme for mobile radio due to its high power efficiency at moderate bit error rates. However, an appropriate pilot signal is required to achieve reliable transmission with coherent modulation on fading channels in code division multiple access (CDMA) technology. In this paper, a pilot-symbol-assisted modulation scheme is investigated. The choice of the slot (including pilot symbols and data symbols) length and pilot spacing is discussed. Since the Doppler spread is related to vehicle speed and carrier frequency, the slot length should be decided by the channel coherent time in order to maintain the required channel quality. It is shown that the higher the vehicle speed, the shorter the slot should be. The spacing of the pilot should be satisfied, also due to the vehicle speed.

关键词： Vehicles Phase shift keying Multiaccess communication Phase modulation Land mobile radio Bit error rate modulation coding Fading Appropriate technology Frequency

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A reduced complexity decoding scheme for wireless applications

A reduced complexity decoding scheme for wireless applicatio...

引用

IEEE Annual Joint Conference: INFOCOM, IEEE Computer and Communications Societies

作者： M. Sajadieh F.R. Kschischang Bell Laboratory Lucent Technologies Inc. Holmdel NJ USA Department Electrical and Computer Eng. University of Toronto Toronto ONT Canada

Cellular transmission standards such as GSM and IS-54 produce data streams with varying degrees of significance at the source encoder level. We propose an unequal error protection scheme based on a non-uniform signal set which provides the more important data with a preferential Euclidean distance. The unequal error protection is partly accomplished by the modulator in contrast to the conventional systems where the channel encoder is solely responsible. The coding gain resulting from the asymmetric modulation can be translated into a reduction in the complexity of the channel encoder; specifically a reduction by more than half in the number of encoder states can be expected. We study the interaction between the code complexity and the modulation asymmetry in quantitative terms. For differentially coherent systems, a /spl pi//6-shifted differential embedded QPSK is proposed. Decentralizing the bit protection culminates in an extra degree of freedom which in turn introduces more flexibility into the system design.

关键词： Decoding Error correction codes Protection modulation coding Code standards GSM Quadrature phase shift keying Constellation diagram Fading Transceivers

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1.6 Mbit/sec high capacity land mobile transmission characteristics of differential coding CDMA over multi-ray Rayleigh fading channel

1.6 Mbit/sec high capacity land mobile transmission characte...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： M. Shamoto M. Ohba Kuixi Yin M. Kishi Denso Corporation Kariya Aichi Japan Nanjing Normal University Nanjing China Aichi Institute of Technology Toyota Aichi Japan

Differential coding CDMA (diffCDMA) is verified to conquer the fatal transmission error when communications are carried from high speed vehicles running through an urban environment with rapid multi-ray Rayleigh channels. With the introduction of differential coding into the primary modulation and employing analytic receiving for primary differential demodulation, the proposed diffCDMA system improves the transmission characteristics of similar CDMA systems such as IS-95 and WcdmaOne IMT2000 for mobile communications at vehicle speeds of more than 100 mile/h mobiles even if a multi-ray environment. Previously, differential coding primary modulation has not been considered for use with CDMA owing to the strict sense synchronization required in demodulation, which suffered from bit error under such rapid multi-ray Rayleigh fading. However, its use is now possible in high speed and high capacity transmission since analytic receiving is being adopted into CDMA systems. In the demodulation procedure of the diffCDMA, the received waves are first detected after multi-ray propagation with certain inevitable errors both in phase and frequency of the recovered carrier for the pseudo synchronization primary demodulation during analytic receiving.

关键词： Multiaccess communication Signal analysis Fading Demodulation Rayleigh channels Phase shift keying Bit error rate AWGN modulation coding Frequency

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Rate-adaptive modulation techniques for infrared wireless communications

Rate-adaptive modulation techniques for infrared wireless co...

引用

IEEE International Conference on Communications (ICC)

作者： L. Diana J.M. Kahn Department of Electrical Engineering and Computer Sciences University of California Berkeley CA USA

While infrared links can support transmission at high bit rates, it is difficult to maintain a signal-to-noise ratio (SNR) sufficient to support these high bit rates under all conditions using reasonable transmitter power levels. Under adverse conditions, instead of incurring abrupt link failure, it is preferable to achieve graceful degradation by lowering the bit rate until a suitably low error probability can be attained. We describe several coding and decoding schemes for rate-adaptive transmission, and we discuss their performance and implementation complexity. The codes considered are rate-compatible punctured convolutional (RCPC) codes and simple repetition codes. Each code is combined with L-ary pulse-position modulation. We present results of a search for families of good RCPC codes derived from rate-1/5 and rate-1/7 mother codes.

关键词： Bit rate Pulse modulation Signal to noise ratio Transmitters Degradation Error probability Decoding Convolutional codes Convolution modulation coding

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