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检索条件"主题词=Modulation coding"

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Low-complexity high-speed 4-D TCM decoder

Low-complexity high-speed 4-D TCM decoder

引用

IEEE Workshop on Signal Processing Systems (SIPS)

作者： Jinjin He Zhongfeng Wang Huaping Liu School of EECS Oregon State University Corvallis OR USA

This paper presents a low-complexity, high-speed 4-dimensional 8-ary Phase Shift Keying Trellis Coded modulation (4-D 8PSK TCM) decoder. In the design, an efficient architecture for the transition metrics unit (TMU) is proposed to significantly reduce the computation complexity without degrading the performance. In addition, pipelining and parallel processing techniques are exploited to increase the decoding throughput. Synthesis results show that the FPGA implementation of the TCM decoder can achieve a maximum throughput of 1.062 Gbps.

关键词： Decoding Throughput Phase shift keying Phase modulation modulation coding Computer architecture Degradation Pipeline processing Parallel processing Field programmable gate arrays

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Performance Analysis of Ranging System Based on Combined modulation Using Spectral Correlation Method

Performance Analysis of Ranging System Based on Combined Mod...

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Congress on Image and Signal Processing, CISP

作者： Xinhong Hao Zhanzhong Cui Beijing Institute of Technology School of Aerospace Science and Engineering Beijing China

A new radio ranging system based on pseudo-random binary-phase code and linear frequency combined modulation is presented. An improved signal processing method of the correlation detection of cyclic autocorrelation function is given and applied to the ranging system. It is proved to be equivalent to the spectral correlation method. The ranging performance and anti-noise ability are simulated and analyzed. The simulation results of ranging precision are in accord with the calculation values. The results show that the spectral correlation method has better ranging precision and stronger anti-noise capability.

关键词： Performance analysis Correlation Chirp modulation modulation coding Signal processing Autocorrelation Background noise RF signals Frequency modulation Jamming

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An overview of multi-mode multi-user adaptation and scheduling techniques in mimo-based fourth-generation wireless systems

An overview of multi-mode multi-user adaptation and scheduli...

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IEEE Convention of the Electrical and ELectronic Engineers in Israel

作者： Arie Reichman Ruppin Academic Center Israel

MIMO-OFDM is widely recognized today as a key combination of technologies to achieve high spectral efficiency and high link reliability over space and frequency selective wireless channels, at a reasonable hardware cost. Both OFDM and MIMO have a variety of modes of operation and parameters and for each channel state, users¿ requirements of data transmission and criterion of estimation performance, there is an optimal scheme and set of parameters based on channel state information. Adaptive switching between MIMO-OFDMA schemes yields significant capacity gains over fixed transmission schemes. A combination of modulation and coding scheme and MIMO method maximizes the throughput whilst satisfying a predefined average BER.

关键词： Space technology MIMO Hardware Costs OFDM Data communication State estimation Channel state information modulation coding Throughput

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A Joint Coded Two-Step Interference Cancellation Technique for a Multiuser MIMO-SC-FDE System

A Joint Coded Two-Step Interference Cancellation Technique f...

引用

International Conference on Systems and Networks Communications (ICSNC)

作者： A. Aljohani J. Chambers Advanced Signal Processing Group Department of Electronic and Electrical Engineering Loughborough University Leicestershire UK

In this paper, we present a transceiver design for a broadband multiuser-MIMO communication system, where the co-channel users are equipped with multiple transmit and multiple receive antennas. In particular, we propose a joint coded two-step interference cancellation scheme which effectively combats the effect of co-channel interference (CCI) and inter-symbol interference (ISI) in multipath channels. To overcome the peak-to-average-power ratio limitation of multicarrier systems, the scheme employs single-carrier frequency-domain equalization (SC-FDE) based modulation combined with time-reversed space-time block codes (TR-STBC). The receiver performs minimum mean-squared error (MMSE) interference suppression at the first stage, and then, CCI cancellation is implemented with a bank of single-user channel decoders. Also, forward error correction outer convolutional encoding, and random bit interleaving are used to correct the carrier in deep fades. To verify the utility of the proposed approach, the paper also includes two sets of average symbol error rate simulations for two different channel models. The first set is for a frequency selective quasi-static fading channel while the secondset is for a Rayleigh fading channel modeled by a modified Jakes' model, both of which confirm the advantage of the proposed scheme.

关键词： Interference cancellation Radiofrequency interference Fading Transceivers Broadband communication Receiving antennas Interchannel interference Intersymbol interference Multipath channels modulation coding

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Formulation of modulation Recommendations for Future NASA Space Communications

Formulation of Modulation Recommendations for Future NASA Sp...

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IEEE Conference on Aerospace

作者： John Wesdock Chitra Patel Frank Stocklin Leslie Deutsch Gary Noreen Jon Hamkins Dennis Lee Advanced Engineering & Sciences Division ITT Corporation Herndon VA USA NASA''s Goddard Space Flight Center Greenbelt MD USA Jet Propulsion Laboratory Pasadena CA USA

The National Aeronautics and Space Administration (NASA) has recently conducted a comprehensive study to identify the most appropriate and efficient modulation, coding, multiple access and link protocol techniques for future space communication links supporting space exploration and science missions. The study was chartered by NASA's space communication and navigation (SCaN) office and is referred to as the coding, modulation, and link protocol (CMLP) study. This paper describes the CMLP modulation evaluation and states the relevant conclusions and recommendations.

关键词： NASA modulation coding Phase modulation Space missions Access protocols Electronic mail OFDM modulation Quadrature phase shift keying Tin Performance evaluation

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On the Impact of Uplink Interference Coordination When Using Multiple Antennas at the Base Station

On the Impact of Uplink Interference Coordination When Using...

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IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference

作者： Gabor Fodor Chrysostomos Koutsimanis Ericsson Research Limited Stockholm Sweden

We consider the uplink of a multi-cell orthogonal frequency division multiple access (OFDMA) system that employs multiple (M > 1) receive antennas and maximum ratio combining at the base station. We propose a model that captures the impact of intercell interference coordination on the modulation and coding scheme dependent bit error rate (BER) performance. We analyze this model in two steps. First, we find a closed form formula to calculate the BER under Rayleigh fading for a single subcarrier. Second, we calculate the subcarrier collision probabilities under random and coordinated subcarrier allocation. Combining these two steps allows us to derive the average BER performance (over all OFDM subcarriers) without/with intercell interference coordination (ICIC). We perform extensive Monte Carlo simulations in order to compare these two schemes when mobile stations are positioned randomly in multi-cell cell system. We find that at low and medium load coordinated allocation is superior (for various values of M), while at higher loads the two schemes perform similarly. We also find that at asymmetric load, it is beneficial to employ "asymmetric ICIC" as opposed to "symmetric ICIC". Finally, we explain a somewhat counterintuitive result that shows that the ICIC gain can be larger with multiple antennas at the base station than when there is only one antenna, although this gain is in the very low BER regime.

关键词： Interference Base stations Bit error rate Receiving antennas Frequency conversion Throughput modulation coding Rayleigh channels Probability OFDM

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New Frequency-Time Scheduling Algorithms for 3GPP/LTE-like OFDMA Air Interface in the Downlink

New Frequency-Time Scheduling Algorithms for 3GPP/LTE-like O...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： M. Assaad A. Mourad Ecole Superieure d''Electricite Gif-sur-Yvette France Mitsubishi Electric ITE-TCL Rennes France

This paper proposes new frequency-time schedulers for 3GPP/LTE-like system in the downlink. 3GPP/LTE DL is OFDMA-based with adaptive modulation and coding (AMC) and frequency-time scheduling to enhance spectral efficiency and aggregate system throughput. Time-frequency scheduling and AMC can be implemented jointly or separately i.e. sequentially AMC after scheduling. Two novel schedulers are proposed in this paper with respectively joint and separate implementation of scheduling and AMC. Through system level performance evaluation, results show that the first scheduler with separate AMC and scheduling implementation outperforms the second scheduler (with joint AMC implementation) in terms of trade off between fairness and capacity and implementation complexity.

关键词： Scheduling algorithm Downlink Resource management Quality of service modulation coding Throughput Aggregates Time frequency analysis Radio communication Slot antennas

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A New data coding method for wireless command transmission BPSK modulator in implantable neural signal acquisition system

A New data coding method for wireless command transmission B...

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IEEE Conference on Electron Devices and Solid-State Circuits

作者： Z. M. Lianga B. Lia Z. H. Wua Institute of Microelectronics School of Electronic and Information Engineering South China University of Technology WuShan China

In wireless implantable neural signal acquisition system, the transmitting of the configuration data to the internal module needs high reliability. Therefore, differential coding is often used in this data transmitting system. However, it requires highly reliable clock synchronization between the internal and external system, leading to the design extremely difficult. To solve this problem, a new data encoding method based on pulse width modulation is presented in this paper to make the internal and external modules can work at asynchronous system clocks with a clock detector designed to make the internal device fit the different clock frequencies. The new coding method is shown to be successful by a board circuit system and the testing results.

关键词： Binary phase shift keying modulation coding Clocks Pulse width modulation Circuit testing Frequency synchronization Encoding Space vector pulse width modulation Detectors System testing

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Joint turbo channel estimation and data recovery in fast fading mobile coded OFDM

Joint turbo channel estimation and data recovery in fast fad...

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

作者： Daniel N. Liu Michael P. Fitz Department of Electrical Engineering University of California Los Angeles Los Angeles CA USA

Orthogonal frequency division multiplexing (OFDM) systems suffer performance degradation in fast fading channels due to intercarrier interference (ICI). Combining frequency domain equalization and bit-interleaved coded modulation (BICM), the iterative receiver is able to harvest both temporal and frequency diversity. In order to perform coherent detection and estimation, channel state information (CSI) is critical. Conventional frequency domain channel estimation (CE) methods have an irreducible error floor at high normalized Doppler frequency f d T s , since ICI corrupts the orthogonality among subcarriers. Considering that the fast time-varying channel is also a source of temporal diversity, CE ought to take place in the pre-FFT time domain. With soft a priori information about the data symbols becomes available, this paper proposes a turbo channel estimator (TCE) structure which provides a way to consistently improve the bit error rate (BER). The complexity of TCE is further reduced by completely avoiding matrix inversion. Simulation results demonstrate that the PSAM system with TCE achieves no ICI with normalized Doppler frequency f d T s up to 20.46% with realistic mobile WiMAX channel environment.

关键词： Channel estimation Fading OFDM Diversity reception Frequency domain analysis Bit error rate Degradation Interference Interleaved codes modulation coding

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Geometry-enhanced modulation of group velocity in nano-waveguides

Geometry-enhanced modulation of group velocity in nano-waveg...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Viktor A. Podolskiy Alexander A. Govyadinov Department of Physics Oregon State University Corvallis OR USA Department of Bioengineering University of Pennsylvania Philadelphia PA USA

We demonstrate that modulation of geometry of nanoscale waveguides may dramatically enhance the modulation of group velocity in dispersive media and illustrate the developed formalism on examples of plasmonic nanorod ... 详细信息

ISBN: (纸本)9781557528599

关键词： Optical waveguides Optical pulses Pulse modulation Dispersion Optical modulation Optical propagation modulation coding Plasmons Optical surface waves Optical materials

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