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检索条件"主题词=modulation coding"

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Performance of DS/GMSK/PSK modem using four-phase correlator

Performance of DS/GMSK/PSK modem using four-phase correlator

引用

IEEE International Symposium on Spread Spectrum Techniques and Applications

作者： Y. Yano H. Tachika T. Fujino Radio Communication Department Information Technology R & D Center Mitsubishi Electric Corporation Limited Kamakura Kanagawa Japan

Direct-sequence spread-spectrum (DS/SS) system has been extensively studied for land mobile communications because of the notable and attractive features such as its robustness and applicability to code division multiple access (CDMA). We propose a DS/SS modulation method which employs Gaussian-filtered minimum-shift-keying (GMSK) and permits simple code acquisition. The modulated signal can be demodulated by a four-phase correlator which can obtain the correlation value of the received signal even if a phase difference between the transmitter and the receiver exists. The bit error performance obtained by the hardware experiments ensures the validity of this modulation method.

关键词： Phase shift keying Modems Correlators Multiaccess communication Spread spectrum communication Mobile communication Robustness modulation coding Gaussian processes Phase modulation

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Turbo-MIMO-OFDM multiuser detection with uplink precoding in frequency-selective fading channels

Turbo-MIMO-OFDM multiuser detection with uplink precoding in...

引用

International Conference on Communications, Circuits and Systems (ICCCAS)

作者： Yang Hu Changchuan Yin Guangxin Yue Department of Telecommunications Engineering Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)0780390156

In this paper, we consider the uplink of a coded MIMO-OFDM multiuser system with transmitting precoding in frequency-selective fading channels, where the transmitters (user) as well as the receiver (base station) are equipped with multiple antennas. Each user's information bit sequence is independently encoded by a turbo encoder, spatial multiplexed and then spread by orthogonal Walsh code (OWC), interleaved, linear precoded, OFDM modulated and transmitted through its transmit antennas. At the receiver, we combine interference cancellation (IC) detection of multiple antennas and multiuser and turbo decoding to form a system iterative feedback structure, which jointly optimizes and improves the performance of detection and decoding. In this paper, we also consider a scheme for transmitting linear precoding to balance the complexity of transmitter and receiver and help to improve the ability of IC detection. Through computer simulation results, we verify the system performance in frequency-selective fading channels.

关键词： Multiuser detection Frequency-selective fading channels Transmitters Receiving antennas Iterative decoding Base stations Transmitting antennas modulation coding OFDM modulation Interference cancellation

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Realistic Performance of HSDPA Evolution 64-QAM in Macro-Cell Environment

Realistic Performance of HSDPA Evolution 64-QAM in Macro-Cel...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Ahmed Saadani Jean-Baptiste Landre Orange Laboratories Moulineaux France

The HSDPA system evolution introduces new modulation and coding schemes (MCSs) that use 64 QAM modulation in order to increase the maximum achievable throughput. We propose in this work to evaluate with a realistic approach the new mobile categories performance in macro-cell environments. This approach is based on link level simulations and drive test measurements. By considering a classic network configuration and using the LMMSE equalizer with receiver diversity, we show that there is no throughput gain compared to Release 5 MCSs using 16-QAM modulation. However, interesting throughput enhancements are obtained when the base station increases its transmitted power to 40 Watt.

关键词： Multiaccess communication Throughput Testing Equalizers modulation coding RAKE receivers Downlink Base stations Fading Multiple access interference

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Space-time coded GMSK for wireless communication

Space-time coded GMSK for wireless communication

引用

IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS)

作者： R.H.-H. Yang Shiunn-Jang Chern Guo-Ching Shiu Ming-Tsai Lee Department of Computer and Communication Engineering National Kaohsiung First University of Science and Technology Kaohsiung Taiwan Department of Electrical Engineering National Sun Yat-Sen University Kaohsiung Taiwan

Recently, the technique of space-time (ST) code design based on minimum shift keying (MSK), an offset format, using delay diversity was proposed by Cavers. ST code with MSK gives much better performance than QPSK, for the same number of states. In this paper, this concept is extended to ST coded GMSK (Gaussian MSK). By using a sum of PAM signals to approximate GMSK, called linearized GMSK, and if only the highest energy component is considered, then GMSK is also in an offset format. Numerical results show that ST coded GMSK code gives much better bandwidth efficiency than MSK, with only a little performance loss and an increasing in decoding complexity.

关键词： Wireless communication Delay Continuous phase modulation Maximum likelihood estimation Quadrature phase shift keying Maximum likelihood decoding modulation coding Bit error rate Phase modulation Transmitting antennas

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CMOS design of pulse coded adaptive neural processing element using neural-type cells

CMOS design of pulse coded adaptive neural processing elemen...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： G. Moon M.E. Zaghloul Electrical Engineering and computer Science Department George Washington University Washington D.C. DC USA

The authors present the CMOS design of an adaptive neural processing element (NPE). The CMOS circuit encodes information using pulse coded neural-type cells (NTC). The synaptic junctions are realized by voltage-controlled resistors in the NTC where the conductance of these resistors determine weights. The information is coded into a form of pulse duty cycle. The pulse duty cycle modulation (PDCM) technique is briefly reviewed. Weights, expressed in terms of the pulse duty cycle, are adaptively controlled through feedback circuits using a simple differential amplifier. This differential amplifier compares the present output with a desired reference value. The difference is used to adjust the weights through changing of the equivalent resistance value of the voltage-controlled resistor in the NTC. Simulation results of simple examples verified the design concepts.< >

关键词： CMOS process Pulse modulation Pulse circuits Resistors Space vector pulse width modulation modulation coding Voltage control Moon Immune system Circuit simulation

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An integrated FSK-signaling scheme for OFDM-based advanced cellular radio

An integrated FSK-signaling scheme for OFDM-based advanced c...

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IEEE Conference on Vehicular Technology (VTC)

作者： B. Stantchev J. Kuehne M. Bronzel G. Fettweis Chair for Mobile Communications Systems Department of Electrical Engineering Dresden University of Technology Dresden Germany

Future broadband picocellular networks demand powerful modulation and coding methods under the tight constraints of affordable modem complexity and low power consumption for the mobile terminal (MT). In order to increase battery life and allow low-cost mobile equipment to be effectively integrated in such a broadband system we propose the use of a separate low-rate signaling channel (SSC) on the physical layer. This additional channel has the primary function of power saving. For this purpose it takes on connection and mobility control functions as well as further tasks on broadcasting and synchronization. A new concept of a broadband TDMA system is presented, incorporating OFDM for the physical high rate data channel (D-channel) and CPFSK modulation with non-coherent detection for the low-rate SSC, whereby both channels are separated in frequency. Modem and system design issues are discussed and evaluated by simulation.

关键词： Modems modulation coding Energy consumption Batteries Physical layer Broadcasting Frequency synchronization Time division multiple access OFDM modulation Frequency shift keying

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Blind recovery of multiple packets in ad hoc mobile networks using polynomial phase modulating sequences

Blind recovery of multiple packets in ad hoc mobile networks...

引用

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

作者： M.M. Lara A.G. Orozco-Lugo D.C. McLernon H.J. Muro-Lemus Sección de Comunicaciones Centro de Investigación y de Estudios Avanazados del Instituto Politécnico Nacional Mexico Mexico Institute of Integrated Information Systems School of Electronic and Electrical Engineering University of Leeds Leeds UK

We consider multiple packet reception (MPR) for asynchronous random access wireless mobile ad hoc networks. An interference cancellation algorithm is proposed that exploits the baseband cyclostationarity properties of the signal, which are induced at the transmitters by means of modulating the symbols with distinct polynomial phase sequences. In contrast to the method presented in van der Veen et al. (2002), the proposed technique does not require knowledge of the starting time of transmission of the desired signal and can be applied to dispersive multipath channels. Also a practical way of assigning the modulating sequences via the use of a common codebook known to all nodes is proposed, and the impact on local throughput of such a scheme is analyzed.

关键词： Polynomials Phase modulation Mobile ad hoc networks Interference cancellation Baseband Transmitters Dispersion Multipath channels modulation coding Throughput

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Design of coded modulation schemes for orthogonal transmit diversity

Design of coded modulation schemes for orthogonal transmit d...

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IEEE International Symposium on Information Theory

作者： M.J. Borran M. Memarzadeh B. Aazhang Department of Electrical and Computer Engineering Rice University Houston TX USA

ISBN: (纸本)0780371232

We propose a concatenated orthogonal space-time code structure to decouple the problems of maximizing spatial and temporal diversity gains in fast Rayleigh fading channels. We also introduce the idea of constellation expansion to design the outer coded modulation scheme. It is shown that the code design criteria reduce to the maximization of Hamming and product distances in the expanded constellation.

关键词： modulation coding Space time codes Diversity methods Fading Concatenated codes Receiving antennas Upper bound Redundancy Couplings Design methodology

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Lossless compression for medical imaging systems using linear/nonlinear prediction and arithmetic coding

Lossless compression for medical imaging systems using linea...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： W.W. Jiang S.-Z. Kiang N.Z. Hakim H.E. Meadows Center for Telecommunications Research and Department of Electrical Engineering Columbia University New York NY USA AT and T Bell Laboratories Inc. Holmdel NJ USA

A differential pulse code modulation (DPCM)-based system is proposed for lossless compression of medical images. Three techniques are used in the system. The intensity of the current pixel is predicted optimally by linear combination of the intensities of N pixels in a neighborhood of the causal region. The multilayer perceptron, a feedforward neural network, is used to model the nonlinearity in images. A hierarchical prediction scheme is adapted for progressive transmission. Coefficients for each hierarchical layer are chosen optimally to achieve minimum entropy. Prediction errors, assumed to be Laplacian distributed, are encoded by the Q-coder, an adaptive arithmetic coder.< >

关键词： Biomedical imaging Image coding Pulse modulation Pulse compression methods modulation coding Multilayer perceptrons Neural networks Multi-layer neural network Feedforward neural networks Entropy

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Sphere decoding of space-time codes

Sphere decoding of space-time codes

引用

IEEE International Symposium on Information Theory

作者： O. Damen A. Chkeif J.-C. Belflore Télécommunications Paris Ecole Nationale Supérieure dArts et Métiers Paris France

We explore in this paper the lattice sphere packing representation of a multi-antenna system and the algebraic space-time (ST) codes. We apply the sphere decoding (SD) algorithm to the resulting lattice code. For the uncoded system, SD yields, with a small increase in complexity, a huge improvement over the well-known V-BLAST detection algorithm. SD of algebraic ST codes exploits the full diversity of the coded multi-antenna system, and makes the proposed scheme very appealing to take advantage of the richness of the multi-antenna environment. The fact that the SD does not depend on the constellation size, gives rise to systems with very high spectral efficiency, maximum likelihood (ML) performance, and low decoding complexity.

关键词： Space time codes Maximum likelihood decoding Lattices Maximum likelihood detection Detection algorithms Error analysis modulation coding Mobile communication Redundancy Transmitters

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