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检索条件"主题词=Modulation Coding"

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Transmitter-receiver design in multicarrier CDMA communications

Transmitter-receiver design in multicarrier CDMA communicati...

引用

Asilomar Conference on Signals, Systems & Computers

作者： Hujun Yin Hui Liu Dept. of Electr. Eng. Washington Univ. Seattle WA USA Department of Electrical Engineering University of Washington Seattle WA USA

ISBN: (纸本)0780351487

We consider the design of multiuser receivers for multicarrier direct-sequence CDMA communications over fading channels. We present a class of spreading codes that enables the simple despreading-combining (DC) receiver to achieve the performance of an optimum multiuser linear receiver. These codes are shown to be optimum for independent fading channels under the code design criterion derived. Simulation results are provided to demonstrate the significant gains in performance and simplicity due to the proposed techniques.

关键词： Multiaccess communication Fading Multicarrier code division multiple access Baseband Frequency Narrowband Performance gain Performance analysis Statistical analysis modulation coding

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A study of turbo codes for multilevel modulations in Gaussian and mobile channels

A study of turbo codes for multilevel modulations in Gaussia...

引用

Canadian Conference on Electrical and Computer Engineering (CCECE)

作者： L. Sylla P. Fortier Department of Electrical and Computer Engineering Laval University Sainte-Foy QUE Canada

In this paper, we present simulation results for a system combining turbo codes and multilevel modulation. This scheme is shown to be an excellent solution when it comes to transmission over bandlimited channels. Its ... 详细信息

关键词： Turbo codes modulation coding Decoding Land mobile radio Delay Frequency Intersymbol interference Computational modeling Computer simulation OFDM

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Principal ratio combining for fixed wireless applications when transmitter diversity is employed

Principal ratio combining for fixed wireless applications wh...

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International Conference on Universal Personal Communications

作者： V. Tarokh T.K.Y. Lo AT and T Research Laboratories Florham Park NJ USA AT&T Wireless Services Inc. Redmond WA USA

We present a near-optimal detection method for decoding codes appropriate to transmission using multiple transmit antennas in a fixed wireless environment. The method is a non-trivial generalization of maximum ratio c... 详细信息

关键词： Diversity reception Transmitters Transmitting antennas Fading Receiving antennas Decoding Bandwidth Constellation diagram modulation coding Signal processing

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On DS-SS code acquisition time probability distribution-Serial search by multiple-dwell detector in fading channel

On DS-SS code acquisition time probability distribution-Seri...

引用

IEEE International Symposium on Spread Spectrum Techniques and Applications

作者： J. Simsa Institute of Radio Engineering and Electronics Academy of Sciences슠of the슠Czech Republic Praque Czech Republic

The complete description of code acquisition time is given by its probability distribution. In the contribution, serial search multiple-dwell code acquisition of a direct sequence spread spectrum receiver is analyzed and acquisition time probability distribution is derived using its moment generating function. The method is applied to a nonselective fading channel, which causes the amplitude of a random received signal. The probability distribution is expressed as an average over a given amplitude probability distribution.

关键词： Probability distribution Detectors Testing modulation coding Signal generators Fading Spread spectrum communication Delay Uncertainty Binary phase shift keying

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Concatenated coded spreading with coherent demodulation for DS-CDMA

Concatenated coded spreading with coherent demodulation for ...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： T. Frey P. Schramm Information Technology Department University of Ulm (EBS) Ulm Germany Research and Development Radiocommunication Ericsson Eurolab Deutschland GmbH Nurnberg Germany

In DS-CDMA systems, spreading may be viewed as inner coding and user-specific scrambling. In practice, spreading is combined with an outer convolutional code, which leads to so-called concatenated coded spreading (CCS). The standard approach is to use repetition codes. In the IS-95 uplink, a (64,6,32) orthogonal code is defined, which can be interpreted as 64-ary orthogonal modulation. In this paper, a CCS scheme with power efficiency superior to the IS-95 uplink is proposed. The use of decision-directed coherent demodulation for both schemes is discussed, and it will be shown that the coding gain of the improved CCS requires a modified channel estimation scheme.

关键词： Concatenated codes Demodulation Multiaccess communication Carbon capture and storage Convolutional codes Channel estimation modulation coding Binary phase shift keying AWGN channels Information technology

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Noncoherent sequence detection of coded linear modulations

Noncoherent sequence detection of coded linear modulations

引用

International Conference on Universal Personal Communications

作者： G. Colavolpe R. Raheli Dipartimento di Ingegneria dellInformazion Università di Parma Parma Italy

New noncoherent sequence detection algorithms for combined demodulation and decoding of coded amplitude/phase modulations transmitted over additive white Gaussian noise (AWGN) channels are presented. Optimal noncoherent sequence detection requires a tree search and a complexity exponentially increasing with the duration of the transmission. In order to realize simple suboptimal receivers based on the Viterbi algorithm (VA), approximate schemes are proposed, characterized by a performance which approaches that of coherent detection. In the proposed schemes the tradeoff between complexity and performance is simply controlled by a parameter referred to as implicit phase memory and the number of trellis states. These schemes represent a significant improvement over previous results.

关键词： modulation coding Phase detection Phase frequency detector AWGN Continuous phase modulation Envelope detectors Demodulation Phase modulation Additive white noise Viterbi algorithm

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A study on iterative decoding techniques applied to GSM full-rate channels

A study on iterative decoding techniques applied to GSM full...

引用

IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： F. Jordan K.-D. Kammeyer FB 1 Department of Telecommunications University of Brethemen Bremen Germany

In this paper, we discuss applying iterative decoding algorithms (turbo-equalizer) to GSM speech channels. Although the turbo-equalizer under realistic time-variant channel scenarios has a high potential, we only get a minor performance gain when compared to soft-decision algorithms. Certain constraints of the GSM coding scheme prevent better results. In this paper, we discuss the transition from a very simple data transmission model to a full GSM-compatible system and compare the resulting bit-error-rates (BER).

关键词： Iterative decoding GSM Speech Protection Error correction codes modulation coding Data communication Bit error rate Turbo codes Channel coding

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MS-BCM-MPSK with trellis decoding over uncorrelated fading channels

MS-BCM-MPSK with trellis decoding over uncorrelated fading c...

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International Conference on Universal Personal Communications

作者： K. Mohamed-Pour Department of Electrical Engineering K.N. Toosi University of Technology Tehran Iran

Block coded modulation (BCM) schemes have been shown that present useful performance in the sense of significant coding gain without the increase in bandwidth necessarily required by more conventional channel coding. In this paper a novel approach for enhancing the bandwidth efficiency is introduced, in which multiple-symbol sequences are constructed by several BCM schemes and are mapped with MPSK modulation. This new design, called MS-BCM-MPSK, which for simplicity with double-symbol and 16-PSK signalling is simulated over an uncorrelated fading channel, and its performance is compared with some TCM codes. Trellis decoding of the scheme and the structural development is detailed.

关键词： Decoding Fading Bandwidth modulation coding Block codes Viterbi algorithm Performance gain Channel coding Signal design Bit rate

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Blind equalization based on spatial and temporal diversity in block coded modulations

Blind equalization based on spatial and temporal diversity i...

引用

IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

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

Linear block codes can be applied in spatial and/or temporal diversity receivers in order to develop high performance schemes for 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 blind channel equalizers in low EbNo scenarios.

关键词： Blind equalizers modulation coding Redundancy Mobile communication Block codes Availability Stability Error correction Electronic mail Algorithm design and analysis

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Software radio structure for second generation mobile communication systems

Software radio structure for second generation mobile commun...

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IEEE Conference on Vehicular Technology (VTC)

作者： A. Wiesler F. Jondral Institut für Nachrichtentechnik Universität Karlsruhe Germany

Third generation mobile communication systems like the European UMTS will enable a flexible communication, free from standard specific regulation of modulation, channel coding, baud rate and multiple access schemes. This flexibility can only be reached by a radio structure which performs all baseband functions in software and is therefore totally software programmable. To ensure that different software configurations can be understood and supported by all mobile terminal architectures a general programming language is required to describe the used air interface components. By the example of the second generation mobile communication systems like the European GSM, the Japanese PDC, the American IS-54 (respectively IS-136) and the European wireless communications system DECT, a common description and implementation of the transceiver functions like channel coding, modulation and equalisation have been developed.

关键词： Software radio Mobile communication 3G mobile communication modulation coding Channel coding Software performance Communication standards Baseband Computer architecture Computer languages

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