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IEEE International Conference on Acoustics, Speech, and Signal Processing

作者： Yiyue Wu Robert Calderbank Department of Electrical Engineering Princeton University Princeton NJ 08544 USA

ISBN: (纸本)9781424442959

This paper provides a framework for designing space-time codes to take advantage of a small number of feedback bits from the receiver. The new codes are based on circulant matrices and simple conditions are derived that guarantee full rate and full diversity. In the absence of feedback, Symbol Error Rate (SER) performance is shown to be similar to that of Diagonal Algebraic space-time (DAST) codes, both for Maximum Likelihood (ML) decoding and for suboptimal linear decoding. Decoding complexity of circulant codes is similar to the DAST codes and encoding is slightly less complex. In the presence of a small number of feedback bits from the receiver the circulant construction is shown to permit integration of space-time coding with a fixed set of beams by simply advancing the phase on one of the antennas. This integration is not possible within the DAST framework. Integration of space-time codes with beamforming makes it possible to achieve ML decoding performance with only linear decoding complexity or to improve upon ML performance of the original code.

关键词： Beamforming DNA Integration integration circulation space-time codes Feedback DEcoding spacetime Drug Abuse Screening Tests Codes space-time coding Computer Programming Languages

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Pair space-time Trellis Codes and Linear Constellation Precoding for MIMO-OFDM Systems

Pair Space-Time Trellis Codes and Linear Constellation Preco...

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IEEE第14届国际个人无线移动通信大会

作者： Jongwha Chong Dept. of Electronics Engineering Hanyang University Seoul Korea

This paper proposes a subchannel grouping scheme for MIMO-OFDM systems that transmit signals over frequency- selective fading channel. Based on the subchannel grouping, we propose a coding strategy

关键词： space-time coding MIMO OFDM linear constellation precoding

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Frequency synchronization of transmitter diversity schemes for OFDM system

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Dianzi Yu Xinxi Xuebao/Journal of Electronics and Information Technology 2004年第10期26卷 1548-1554页

作者： Lu, Jun-Zhe Wang, Ya-Li Zhang, Hai-Lin Liu, Zeng-Ji National Key Lab of ISN Xidian University Xi'an 710071 China

The OFDM transmitter diversity has gotten more attention in recent years. However, OFDM systems are very sensitive to frequency-offset. Therefore, it is necessary to estimate effectively and to compensate frequency-offset in the systems. This paper presents a blind and adaptive fine frequency-offset estimation method firstly, and then proposes a coarse frequency-offset estimation method based on pilot frequency. Finally, simulation results verify these methods.

关键词： Frequency-offset correction OFDM space-time coding Transmitter diversity

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A Low-Complexity Near-ML Detector for a 3 × n_R Hybrid space-time Code

A Low-Complexity Near-ML Detector for a 3 × n_R Hybrid Spac...

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IEEE Latin-American Conference on Communications

作者： Joaquin Cortez Miguel Bazdresch Omar Longoria-Gandara Electrical Engineering Department Instituto Tecnologico de Sonora Cd. Obregon Mexico Eng. Tech. Department Rochester Institute of Technology Rochester NY USA Department of Electronics ITESO University Guadalajara México

In a MIMO wireless communications system, a space-time block code specifies how the data symbols are transmitted over different antennas at different time instants. A hybrid space-time code attempts to obtain some of the available diversity and multiplexing gains, achieving low error probability and high data rate. The LD STBC-VBLAST hybrid code layers one spatial-multiplexing antenna (to increase the data rate) and one Alamouti encoder (to provide diversity). A low-complexity, nearly optimum decoder algorithm for LD STBC-VBLAST is presented. Its error probability is comparable to that of a maximum-likelihood detector, with much lower computational complexity. The performance of the detector is evaluated over both uncorrelated and correlated channels. It is shown that the proposed decoder remains nearly optimum despite channel correlation.

关键词： space-time coding Near-ML detectors Correlated Channels

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Network coding in Multiple Access Relay Channel with Multiple Antenna Relay

Network Coding in Multiple Access Relay Channel with Multipl...

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International Conference on Computing, Networking and Communications

作者： Lili Wei Wen Chen Rose Qingyang Hu Geng Wu Department of Electrical and Computer Engineering Utah State University Logan UT USA. Department of Electronic Engineering Shanghai Jiao Tong University Shanghai China. Mobile and Communication Group Intel Corporation USA.

ISBN: (纸本)9781479923601

Network coding is a paradigm for modern communication networks by allowing intermediate nodes to mix messages received from multiple sources. In this paper, we carry out a study on network coding in multiple access relay channel (MARC) with multiple antenna relay. Under the same transmission time slots constraint, we investigate several different transmission strategies applicable to the system model, including direct transmission, decode-and-forward, digital network coding, digital network coding with Alamouti space time coding, analog network coding, and compare the error rate performance. Interestingly, simulation studies show that in the system model under investigation, the schemes with network coding do not show any performance gain compared with the traditional schemes with same time slots consumption.

关键词： multiple access relay channel network coding cooperative space-time coding

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A MIMO Protocol for Camera Communications (CamCom) using Undersampled Frequency Shift ON-OFF Keying (UFSOOK)

A MIMO Protocol for Camera Communications (CamCom) using Und...

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IEEE Globecom Workshops

作者： Richard D. Roberts Intel Labs Intel Corporation

ISBN: (纸本)9781479928521

Camera communications is the use of an image sensor to receive LED modulated data. The undersampling properties of UFSOOK allows the encoding of bits at frequency shift ON-OFF keying frequencies that avoid flicker while at the same time being successfully decoded by a low frame rate camera. PWM dimming is supported via data modulation of the PWM frequency, but requires that FEC be added in the form of multi-phase sampling due to asynchronous clocking. Multiple LEDs can be modulated to send parallel data streams to the receiver enabling MIMO. This paper introduces a simple protocol that will allow the transmitter to inform the receiver how the MIMO data streams should be processed to realize the FEC and reconstruct the transmitted message.

关键词： Camera communications Frequency shift ON-OFF keying Undersampling Visible light communications Image sensor communications VLC UFSOOK CamCom FEC Forward error correction Multi-phase sampling space-time coding MIMO

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space-time CODES FOR ACTIVE ANTENNA SYSTEMS: COMPARATIVE PERFORMANCE ANALYSIS

SPACE-TIME CODES FOR ACTIVE ANTENNA SYSTEMS: COMPARATIVE PER...

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IET International Radar Conference

作者： G. Babur P. Aubry F. Le Chevalier Delft University of Technology (TU Delft) The Netherlands

ISBN: (纸本)9781629931340

In this paper, the basic tools for performance analysis of space-time coding for active antenna systems (or colocated coherent MIMO systems) are presented, and illustrated with four different space-time codes: M-sequences, Alltop codes -quadratic and cubic -, and multiple shifted chirps. The relative effectiveness of these different codes is then measured with specific factors of merit, designed for radar paerformances evaluation. These factors of merit, easily extracted from the ambiguity functions, are shown to allow operational consequences to be drawn from space-time codes characteristics.

关键词： space-time coding radar waveforms ambiguity function multipath clutter

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ADAPTIVE TRANSMIT/RECEIVE SCHEMES FOR MIMO RADAR

ADAPTIVE TRANSMIT/RECEIVE SCHEMES FOR MIMO RADAR

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2nd IEEE International Workshop on Computational Advances in Multi-Sensor Adaptive Processing (CAMPSAP 2007)

作者： Antonio De Maio Marco Lops Dipartimento di Ingegneria Elettronica e delle Telecomunicazioni Federico II University Naples Italy DAEIMI University of Cassino Cassino Italy

In this paper we consider the issue of adaptive transmission and detection for MIMO radars operating under clutter with unknown covariance. In particular, we show that the availability of a set of secondary data allows defining Constant-False-Alarm Rate (CFAR) receivers starting upon a family of previously known non-adaptive structures. We also show that, if the clutter correlation remains constant in several scans, an adaptive waveform selection procedure can also be implemented. The results show that the adaptive transmit/receive structures perform satisfactorily in comparison to their non-adaptive counterparts, the loss being in the order of 2-3dB's for customary values of the system parameters.

关键词： MIMO Radar Adaptive Processing space-time coding Clutter

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Impact of Satellite Channel on MIMO-Adaptive Beamforming Systems

Impact of Satellite Channel on MIMO-Adaptive Beamforming Sys...

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2007 International Waveform Diversity & Design Conference

作者： Mostafa Hefnawi Electrical & Computer Engineering Department of RMC Canada's Military University Kingston Canada

This paper aims to investigate the effect of nonlinear satellite channels as well as multipath fading and CCI on the performance of a MIMO-beamforming system. Simulation results confirm the decrease in system performa... 详细信息

ISBN: (纸本)9781424412754;1424412757;1424412765

关键词： Component MIMO system Adaptive-beamforming space-time coding Transmit diversity Code-filtering approach Satellite channel

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Application of transmit diversity for improved robust watermarking

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Chinese Journal of Systems Engineering and Electronics 2004年第2期000卷

Many common multimedia signal processing, including cropping, filtering, and perceptual coding, make watermark signal fading-like modification. A scheme that applies transmit diversity technique to improve robustness of digital watermarking is presented. First, the scheme decomposes the original image using wavelet pyramid algorithm and chooses the middle-frequency band for transmission channel that the watermark will be embedded into. Then the watermark is pseudo-randomly permuted. The scheme makes use of space-time coding and differential detection technique to embed and extract watermark. The extracting process has access to neither the original image nor channel state information. Experimental results demonstrate that the scheme improves the performance of robust watermarking.

关键词： digital watermark transmit diversity space-time coding differential detection wavelet transform

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