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检索条件"主题词=Modulation Coding"

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Redundancy in block coded modulations for channel equalization based on spatial and temporal diversity

Redundancy in block coded modulations for channel equalizati...

引用

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

作者： G. Vazquez F. Rey M. Lamarca Department of Signal Theory and Communications Polytechnic University of Catalonia Barcelona Spain

Linear block codes in the complex field can be applied in spatial and/or temporal diversity receivers in order to develop high performance schemes for (almost-) blind equalization in mobile communications. The proposed technique uses the structure of the encoded transmitted information (with redundancy) to achieve equalization schemes based on a deterministic criterion. Simulations show that the proposed technique is more efficient than other schemes that follow similar equalizer structures. The result is an algorithm that provides the design of channel equalizers in low EbNo scenarios.

关键词： modulation coding Redundancy Mobile communication Block codes Equations Blind equalizers Statistics Time division multiple access Robust stability Decoding

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Robust image transmission using source adaptive modulation and trellis-coded quantization

Robust image transmission using source adaptive modulation a...

引用

IEEE International Conference on Image Processing

作者： J.E. Kleider G.P. Abousleman Systems Solutions Group Motorola Scottsdale AZ USA

The paper presents a robust, low-complexity method of transmitting digitally compressed imagery through very noisy channels. The method is applicable to AWGN and fading channels. The proposed method uses a robust wavelet based image coder employing trellis-coded quantization (TCQ), and optimal source adaptive modulation (SAM) which is implemented through time-frequency diversity. We compare the performance of the SAM-TCQ system to that of a system that utilizes unequal error protection (UEP). We show that for the binary symmetric channel (BSC), the SAM-TCQ system performs as well as UEP-TCQ at high bit error rates (BER), and within 1 dB of the UEP-TCQ system at low bit error rates.

关键词： Robustness Image communication Bit error rate Image coding Additive white noise Gaussian noise AWGN Fading Quantization modulation coding

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A noncoherent coded modulation for 16QAM

A noncoherent coded modulation for 16QAM

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MILCOM, Military Communications Conference

作者： Pingyi Fan Xiang-Gen Xia Department of Electrical and Computer Engineering University of Delaware Newark DE USA

We present a noncoherent coded 16QAM (NC-16QAM) scheme by modifying the trellis-coded 16QAM (TC-16QAM) scheme. Our simulation results show that the performance of the NC-16QAM with noncoherent detection is close to the one of the original TC-16QAM with coherent detection. The NC-16QAM in this paper is an extension of the NC-8PSK previously obtained by Wei and Lin (see IEEE Communications Letters, vol.2, no.9, p.260-62, 1998). A noncoherent initial phase estimation algorithm is also proposed.

关键词： modulation coding Decoding Phase detection Phase estimation Modular construction Phase modulation Detectors Baseband Additive noise Gaussian noise

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An analysis of the effects of filtering on the correlation characteristics of 4-phase sequences for CDMA applications

An analysis of the effects of filtering on the correlation c...

引用

AFRICON Conference

作者： M. Jamil L.P. Linde D.J. van Wyk Department of Electrical & Electronic Engineering University of Pretoria Pretoria South Africa

This paper studies the construction and effects of filtering on the correlation properties of 4-phase sequences that are suitable for the use in spread spectrum multiple access communications. An introduction on the construction methods of these sequences from the set of binary sequences is presented. The effects of filtering on the correlation properties by using Nyquist and constant envelope root-of-unity (CE-LI-RU) filtering technique are also investigated. It is shown that it is possible to achieve better correlation properties by using the latter filtering method while maintaining the perfect constant envelope, which is not possible with Nyquist filtering.

关键词： Filtering Binary sequences Multiaccess communication Spread spectrum communication Phase shift keying Africa Wideband Phase modulation modulation coding Bandwidth

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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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Emulation of transmission links for future S-UMTS constellations: the SUMO testbed

Emulation of transmission links for future S-UMTS constellat...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： H.M. Aziz C. Valadon K. Narenthiran R. Tafazolli B.G. Evans Centre for Communication Systems Research University of Surrey Guildford Surrey UK

In order to evaluate the performance of future S-UMTS constellation, a satellite channel emulator is being developed within the ACTS-SUMO project. With the emulator and the control software developed by the Centre for Communication Systems Research, it is possible to emulate a wide range of satellite constellations (LEO, MEO and GEO) and propagation environments (open, urban, wooded...). Moreover, since the channel bandwidth is equal to 10 MHz, it is possible to use the emulator to evaluate the performance of different modulations, channel coding techniques and multiple access schemes.

关键词： Emulation Testing 3G mobile communication Satellite constellations Bandwidth Communication system control Control systems modulation coding Multimedia systems Artificial satellites

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A fast-acquisition demodulation scheme for 2.4 GHz wireless DSSS transceiver VLSI

A fast-acquisition demodulation scheme for 2.4 GHz wireless ...

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International Symposium on VLSI Technology, Systems and Applications

作者： Hua-Chin Lee Chin-Kae Tzou Chorng-Kuang Wang Viggen Dan Department of Electrical Engineering Chungli Taiwan Hsinchu Taiwan Department of Electrical Engineering Taipei Taiwan Wireless Communication Department Communication Technology Division Computers Communications Laboratory ITRI Hsinchu Taiwan

ISBN: (纸本)0780356209

In this paper, a CMOS cell based system VLSI design for Direct-Sequence Spread-Spectrum (DSSS) wireless LAN transceiver is presented. In addition, an efficient and fast-acquisition demodulation scheme is proposed to use in the receiver architecture. Implementation and testing results are also given. The proposed demodulation scheme can help to positively combine the received signal energy of multipaths so that the detection performance is improved by 3 dB in a typical frequency-selective indoor wireless communication environment. The proposed architecture can synchronize the PN code in 30 /spl mu/s and the chip size is 5600/spl times/4600 /spl mu/m/sup 2/. It can be operated from 3.3 V to 5 V and the power consumption ranges from 189 mW to 250 mW respectively.

关键词： Demodulation Spread spectrum communication Transceivers Very large scale integration Matched filters Transmitters Automatic frequency control Wireless LAN modulation coding Timing

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Power-efficient coded modulation and precoding schemes for wireless infrared communications

Power-efficient coded modulation and precoding schemes for w...

引用

IEEE International Conference on Communications (ICC)

作者： Hyuncheol Park Telecommunication & Network Laboratory Samsung Electronics Company Limited Suwon South Korea

We design new trellis codes based on multiple pulse-position modulation (MPPM) that offer high power efficiency. We randomly search for the optimal code that produces the trellis code with the largest minimum Euclidean distance. To verify our results, we derive an approximation for the minimum distance. We combine partial-response precoding with parallel decision-feedback detection to equalize and to decode the trellis codes. The performance of the proposed scheme is compared to linear equalization, decision feedback equalization, parallel decision-feedback detection, and super-state maximum-likelihood sequence detection. Together, the proposed trellis codes and precoding schemes are an effective solution to the signaling design problem, especially in the face of severe multipath dispersion.

关键词： modulation coding Convolutional codes Decision feedback equalizers Pulse modulation Euclidean distance Maximum likelihood decoding Maximum likelihood detection Signal design Face detection Dispersion

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Performance analysis of wideband CDMA system with coherent demodulation in reverse link

Performance analysis of wideband CDMA system with coherent d...

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IEEE Region 10 International Conference TENCON

作者： Jiang Nanyan Wang Wenbo Yang Dacheng Beijing University of Posts and Telecommunications Beijing China

In this paper, coherent demodulation models, corresponding to two modulation schemes, including pilot channel and pilot symbol assisted in the reverse link of wideband CDMA, are given. Analysis and comparison of the above two schemes with that of noncoherent modulation are given. It is concluded that the performance enhancement, concerning system capacity, is related to the ratio of the pilot signal power to total transmission power in the reverse link for the wideband CDMA systems.

关键词： Performance analysis Wideband Multiaccess communication Demodulation modulation coding Base stations Signal to noise ratio Phase modulation Time division multiplexing Physical layer

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A new layered protocol integrating 5-kHz and 25-kHz DAMA operations: A proposed improvement to the UHF DAMA standards

A new layered protocol integrating 5-kHz and 25-kHz DAMA ope...

引用

MILCOM, Military Communications Conference

作者： G.R. Huckell F.M. Tirpak E.W. Chandler SPAWAR Systems Center San Diego CA USA Milwaukee School of Engineering Milwaukee WI USA

The Joint UHF MILSATCOM Technical Working Group (TWG) is developing a single integrated waveform that will provide a significant improvement over the two current demand assigned multiple access (DAMA) waveforms now required for operation over 5-kHz and 25-kHz UHF military satellite channels. The integrated waveform will be defined in revisions to the two existing standards. Each revised standard will cover a different protocol layer for the integrated waveform. The revised standard for the lower layer will define the interoperable modulation, error-correction coding and multiple-access protocols required to access the satellite channel. The revised standard for the higher layer will define demand-assignment protocols and requirements for voice and data interoperability. This paper describes the proposed waveform and protocols.

关键词： Access protocols Satellite broadcasting Military satellites Transponders Standards development modulation coding Bandwidth Amplitude modulation Interference Military standards

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