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检索条件"主题词=modulation coding"

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Different decoding methods for multilevel coded modulation over Rayleigh fading channels

Different decoding methods for multilevel coded modulation o...

引用

International Conference on Communication Technology (ICCT)

作者： Dong-Feng Yuan Qi Yao Chang-Xiang Wang Zhi-Gang Cao Department of Electrical Engineering Shandong University Jinan Shandong China Department of Electrical Engineering Tsinghua University Beijing China

Based on a "capacity rule", the performance of multilevel coding (MLC) schemes with different decoding methods, which are multistage decoding (MSD) and parallel decoding on level (PDL), is investigated. The work is done for 8ASK modulation and three mapping strategies over Rayleigh fading channels are used. In each scheme BCH codes with different code lengths are used as component codes. Numerical results indicate that MSD is a sub-optimal decoding method of MLC, while PDL is most robust if block partitioning (BP) is used. For Ungerboeck partitioning (UP) and a mixed partitioning (MP) strategy, MSD is strongly recommended for the MLC system, while for the BP strategy, PDL is suggested as a simple decoding method compared with MSD.

关键词： Decoding modulation coding Fading Page description languages Mutual information Capacity planning Robustness Mobile communication Delay effects Channel capacity

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Multilevel codes and iterative multistage decoding: rate design rules and practical considerations

Multilevel codes and iterative multistage decoding: rate des...

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IEEE Conference on Wireless Communications and Networking

作者： M. Jaber Borran B. Aazhang ECE Department Rice University Houston TX USA

ISBN: (纸本)0780365968

It is well-known that multilevel coding (MLC) and multistage decoding (MSD) suffice to approach capacity if the rates at different levels are chosen appropriately. In most of the practical cases, however, the rate design rule for MSD does not leave any room for coding at higher levels of the MLC scheme, which is very important in fading environments. The rate design rule for multilevel coding using iterative multistage decoding is investigated, and it is shown that using iterative MSD with updated a priori probabilities of the constellation points, a broader subregion of the capacity region of the MLC scheme can be achieved.

关键词： Iterative decoding Maximum likelihood decoding modulation coding Mutual information AWGN Signal to noise ratio Fading Capacity planning Constellation diagram Additive white noise

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All-digital impulse radio for MUI/ISI-resilient multiuser communications over frequency-selective multipath channels

All-digital impulse radio for MUI/ISI-resilient multiuser co...

引用

MILCOM, Military Communications Conference

作者： C.J. Le Martret G.B. Giannakis DGNCELAR ECE Department University of Minnesota Minneapolis MN USA ECE Department University of Minnesota Minneapolis MN USA

ISBN: (纸本)0780365216

Impulse radio (IR) is an ultra-wideband system with attractive features for baseband asynchronous multiple access (MA), multimedia services, and tactical wireless communications. Implemented with analog components, the continuous-time IRMA model utilizes pulse-position modulation (PPM) and random time-hopping codes to alleviate multipath effects and suppress multiuser interference (MUI). We introduce a novel continuous-time multiple input multiple output (MIMO) PPM-IRMA scheme, and derive its discrete-time equivalent model. Relying on a time-division-duplex access protocol and orthogonal user codes, we design composite linear and non-linear receivers for the downlink. The linear step eliminates MUI deterministically and accounts for frequency-selective multipath, while a maximum likelihood (ML) receiver performs symbol detection.

关键词： Pulse modulation MIMO Maximum likelihood detection Ultra wideband technology Baseband Multimedia systems Wireless communication modulation coding Interference suppression Access protocols

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On adaptive reduced-complexity iterative decoding

On adaptive reduced-complexity iterative decoding

引用

IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： P.A. Martin D.P. Taylor University of Canterbury Christchurch NZ

This paper develops an adaptive approach to iterative decoding of block turbo codes. The method developed in this paper allows the receiver to adapt to the conditions of the channel, the codes and the modulation scheme. The approach yields improved performance especially in early iterations, for a very small increase in complexity.

关键词： Iterative decoding Product codes AWGN Turbo codes Block codes Statistics Additive white noise Iterative algorithms Binary phase shift keying modulation coding

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Fast code rate adaptation for indoor precoded packet wireless systems

Fast code rate adaptation for indoor precoded packet wireles...

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IEEE Conference on Wireless Communications and Networking

作者： R.E. Badra B. Daneshrad Wireless Integrated Systems Laboratory Electrical Engineering Department University of California Los Angeles USA

ISBN: (纸本)0780365968

The problem of identifying the optimum adaptive channel code rate that achieves a target error performance in a wireless precoded link operating over slowly varying channels is addressed. It is found that pragmatic trellis coded modulation (PTCM) with adaptive QAM constellation is a natural fit to the problem at hand. It supports variable coding rates while providing decoder simplicity. Moreover, it enables the efficient exploitation of the unique features of a precoded system. The article also describes a simple technique for fast code rate adaptation based on channel estimation algorithms that combine the use of intra-frame and inter-frame physical layer information. As a consequence of the implementation of these adaptive techniques, a significant increase in data throughput is achieved, as verified in simulations.

关键词： Channel estimation Physical layer Forward error correction Protection Bit error rate modulation coding Throughput Transmitters Decision feedback equalizers Data communication

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The expectation-maximization algorithm for space-time communications

The expectation-maximization algorithm for space-time commun...

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IEEE International Symposium on Information Theory

作者： C. Cozzo B.L. Hughes Center for Advanced Computing and Communication Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA

This paper investigates the application of the expectation-maximization algorithm for systems with multiple transmit and/or receive antennas in presence of fast fading channels.

关键词： Expectation-maximization algorithms Fading Receiving antennas Iterative algorithms Signal to noise ratio Covariance matrix Channel estimation Application software modulation coding System performance

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A multicarrier QAM modulator for WCDMA basestation

A multicarrier QAM modulator for WCDMA basestation

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： M. Kosunen J. Vankka K. Halonen Electronic Circuit Design Laboratory Helsinki University of Technology Finland

A multicarrier QAM modulator for the wideband code division multiple access (WCDMA) basestation has been designed. The multicarrier modulator performs pulse shaping filtering for four baseband I and Q data streams. The filtered data is interpolated in three stages each interpolating with a factor of two. The modulation of four independent carriers is performed with the numerically controlled oscillators (NCO) which are based on the CORDIC vector rotation algorithm. The multi-carrier output is formed by summation of the modulated carriers. The SINC-attenuation effect of the D/A-converter is canceled by an inverse-SINC predistortion filter. The goal of the design process was to make the performance of the modulator limited by the 14-bit D/A-converter which can be considered as the state of the art available at IF frequencies.

关键词： Quadrature amplitude modulation Multiaccess communication modulation coding Wideband Pulse modulation Pulse shaping methods Filtering Baseband Oscillators Predistortion

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Hybrid concatenated TCM and its application to W-CDMA system

Hybrid concatenated TCM and its application to W-CDMA system

引用

IEEE International Symposium on Spread Spectrum Techniques and Applications

作者： Chenxi Wang Guangguo Bi Department of Radio Eng South East University Nanjing China

This paper presents a new scheme of hybrid concatenated TCM (HCTCM) encoder and the iterative decoder for application to a wideband DS-CDMA system. Simulation results show that HCTCM can achieve better BER performance than turbo code /QPSK with the similar complexity. The influence of the constituent codes and decoding complexity on the BER performance is also investigated.

关键词： Concatenated codes Multiaccess communication Iterative decoding Turbo codes Bandwidth Bit error rate modulation coding Iterative algorithms Bismuth Electronic mail

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Turbo codes with non-linear constituent codes

Turbo codes with non-linear constituent codes

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IEEE Conference on Wireless Communications and Networking

作者： O.Y. Takeshita J. Sun M.P. Fitz Department of Electrical Engineering Ohio State Uinversity Columbus OH USA

Recursive constituent codes are required for parallel concatenated turbo-codes. Some conditions for recursiveness of non-linear constituent codes are given.

ISBN: (纸本)0780365968

Recursive constituent codes are required for parallel concatenated turbo-codes. Some conditions for recursiveness of non-linear constituent codes are given.

关键词： Turbo codes Convolutional codes Feedback Bit error rate modulation coding IIR filters Sun Linear systems Digital filters Finite impulse response filter

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Orthogonal code division multiplexed DSL for interference suppression in cable networks

Orthogonal code division multiplexed DSL for interference su...

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IEEE International Conference on Communications (ICC)

作者： Hsuan-Jung Su E. Geraniotis D.P. Gerakoulis Institute for Systems Research University of Maryland College Park MD USA AT and T Laboratories Florham Park NJ USA

A new scheme termed orthogonal code division multiplexing (OCDM) is proposed for digital subscriber line (DSL) applications. Through the use of serial to parallel conversion and orthogonal codes, a "spreading gain" is achieved against narrowband interference without expanding the required transmission bandwidth of the information signal. Groups of orthogonal codes with different spreading gains and bandlimited (chip) filtering are used together with M-PAM data modulation. Spectral matching (to input power density that achieves the capacity of the copper cable channel) is performed followed by throughput optimization under a symbol error rate (SER) constraint in order to select the system parameters. The OCDM/DSL system performance is evaluated for several scenarios of interest.

关键词： Code division multiplexing DSL Interference Narrowband Bandwidth Filtering modulation coding Impedance matching Copper Throughput

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