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检索条件"主题词=space-time coding"

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Embedded differential space-time coding for wireless broadcast

Embedded differential space-time coding for wireless broadca...

引用

Conference on Emerging Technologies for Future Generation Wireless Communications

作者： Kuo, CH Kuo, CCJ Univ So Calif Integrated Media Syst Ctr Los Angeles CA 90089 USA

ISBN: (纸本)0819446483

An embedded differential space-time coding method is proposed for wireless broadcast application in this work. Our previous work [1] investigated embedded space-time codes for layered media broadcast. In such a system, a transmitter sends out multi-layer source signals by encoding different layers with different space-time codes. Then, the receiver can retrieve a different amount of information depending on the number of antennas it has as well as the level of receiving power. The receiving terminals with one antenna can decode only the base layer information with a low complexity while terminals with more antennas can retrieve more layers of information. In this research, we further consider the case when the channel state information (CSI) is unknwon. The differential coding technique is adopted here. Transmitted symbols are encoded as a certain combination of previous symbols so that the receiver can retrieve the information without CSI. We explore the embedded design with differential STC to enable layered media transmission. Differential detection with Kalman filtering is also investigated to help improve performance.

关键词： space-time coding broadcast channels differential coding

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Fast Phase Distribution Calculation for space-time coding Intelligent Reflecting Surfaces

Fast Phase Distribution Calculation for Space-Time Coding In...

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2021 Conference on Antenna Measurements and Applications

作者： Farashahi, Mohammadreza Seet, Boon-Chong Li, Xue Jun Auckland Univ Technol Dept EEE Auckland New Zealand

ISBN: (纸本)9781728196978

This paper proposes a fast method to calculate the reflection phase distribution for intelligent reflecting surface (IRSs), a.k.a. reconfigurable metasurfaces, to reflect impinged electromagnetic (EM) waves towards a desired angle at different harmonic frequencies shifted from the central frequency. The proposed method exploits the strengths of two techniques, namely 2D Inverse Fast Fourier Transform (IFFT) and an evolutionary optimization approach based on Non-dominated Sorting Genetic Algorithm II (NSGA-II). Results show that the proposed method can reduce the time of conventional phase distribution calculation for a 10x10 metasurface by 98.02%.

关键词： phased-array antenna space-time coding intelligent reflecting surface reconfigurable metasurface beam steering

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Differential space-time coding for Cooperative Relay System over Frequency-selective Channels

Differential Space-Time Coding for Cooperative Relay System ...

引用

International Workshop on High Mobility Wireless Communications (HMWC)

作者： Qi, Cuiling Zhang, Zhaoyang Luo, Xiqian Zhang, Huazi Zhejiang Univ Dept Informat Sci & Elect Engn Hangzhou 310027 Zhejiang Peoples R China Zhejiang Prov Key Lab Informat Networks Hangzhou Zhejiang Peoples R China

ISBN: (纸本)9781479956463

In this paper, a differential space-time coding (D-STC) scheme is presented for relay assisted cooperative wireless communication networks over frequency selective fading channels. Two most common schemes, i.e., differential amplify-and-forward (DAF) and differential decode-and-forward (DDF), are both investigated in our single relay assisted system. Leveraging spectral encoder and differential space-time modulation, our proposed scheme can achieve multipath diversity without instantaneous channel state information at each node. Moreover, the direct link is also taken into consideration. Theoretical analysis demonstrates a diversity gain of L-3 + min {L-1, L-2} + 2, where L-1, L-2 and L-3 are the channel order for source-relay (S -> R), relay-destination (R -> D) and source-destination (S -> D) links, respectively. Simulation results are presented to validate the good performance of the coding scheme and DST modulation of DAF and DDF.

关键词： space-time coding differential modulation frequency-selective multipath diversity

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Infinite Series Representation of the Exact PEP for space-time coding

Infinite Series Representation of the Exact PEP for Space-Ti...

引用

IEEE Global Telecommunications Conference (GLOBECOM 06)

作者： Zhang, Z. Cheung, S. W. Yuk, T. I. Univ Hong Kong Dept Elect & Elect Engn Hong Kong Hong Kong Peoples R China

ISBN: (纸本)9781424403561

The exact Pair-wise Error Probabilities (PEP) formulas developed for space-time (S-T) coding so far either are not in the closed forms or have the closed forms but need to calculate very complicated high order derivatives, and so are not easy to use. This paper derives, for S-T coding in block Rayleigh fading, a new exact PEP formula which is expressed as the summation of a series of terms to the powers of 1/Signal-to-Noise-Ratio (1/SNR). The result gives researchers an easier and more convenient way for bit-error-rate (BER) evaluation and optimization of S-T coded Multiple-Input-Multiple-Output (MIMO) systems. Monte Carlo simulation results of the BER performance of a 2-by-2 S-T coded system are used to verify our results.

关键词： space-time coding exact PEP infinite series

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Track circuit with space-time coding

Track circuit with space-time coding

引用

International Conference on Applied and Theoretical Electricity (ICATE)

作者： Enulescu, Marius TYPSA Construct Supervis Transport Infrastruct Madrid Spain

ISBN: (纸本)9781467385626

Track circuits represent a viable solution for safety data transmission for train traffic, but they are more "demanding" in terms of maintenance. Equipment reliability and functioning stability had been improved by using new transmission technologies and data coding, but nonetheless, the transmission channel confines the audio band frequency and implicitly, the disturbance issues on this range remain topical. The present work introduces a solution which aims to solve the loss of telegrams by train by using some track circuits with space-time coding.

关键词： track circuits intelligent transport systems space-time coding

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A Trace-Orthogonal Multi-User space-time coding

A Trace-Orthogonal Multi-User Space-Time Coding

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3rd International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM 2007)

作者： Ma, Qinghua Liu, Jianguo Yang, Luxi Southeast Univ Sch Informat Sci & Engn Nanjing 210096 Peoples R China

ISBN: (纸本)9781424413119

In this paper, we propose a trace-orthogonal space-time coding (TD-STC) for multi-user systems. Based on the flexibility of linear dispersive codes (LDC), we apply it to broadcast channels in multi-user systems. According to the transmission rates of user's, we adaptively construct the transmitting space-time coding matrix. At the same time, we give the design criterion of the space time coding for multi-user systems. At the receiver, exploiting the characteristic of trace orthogonal, the complexity of decoder based on MMSE criterion will not increase apparently. Compared with orthogonal space-time coding (OSTC), our proposed TD-STC can greatly decrease the complexity of ML decoding instead of little performance loss. When in the lower SNP, the proposed scheme is better than the scheme when applying orthogonal space-time coding.

关键词： trace-orthogonal broadcast channels space-time coding

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Irreducible root systems for space-time coding in wireless communication

Irreducible root systems for space-time coding in wireless c...

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Conference on Digital Wireless Communications V

作者： Andriamanalimanana, BR SUNY Coll Technol Utica Rome Inst Technol Utica NY 13504 USA

ISBN: (纸本)0819449601

The theory of groups and group representations have been shown by several researchers to generate promising space-time codes for multiple-antenna links in wireless communication. In this report, potential codes from a root system in a real Euclidean space are examined. In particular, general properties of codes from the infinite irreducible systems A(1), B-1, C-1, and D-1 are analytically studied, while codes from the exceptional systems G(2), F-4, E-6, E-7 and E-8 are numerically determined. Some of these exceptional codes meet general coding-theoretic expectations, for example in terms of the number of code words. The effort described in this paper is part of a general attempt to assess the use of modular representations of groups, as opposed to classical, i.e. complex-numbered, representations, for antenna diversity. Java technologies are used for the implementation of our numerical experimentation platform.

关键词： root systems wireless communication antenna diversity group representation space-time coding groups of Lie type

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Performance of space-time coding with Variable-power Adaptive Modulation in Fading Channel

Performance of Space-time Coding with Variable-power Adaptiv...

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3rd International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM 2007)

作者： Yu, Xiangbin Nanjing Univ Aeronaut & Astronaut Coll Informat Sci & Technol Nanjing 210016 Peoples R China

ISBN: (纸本)9781424413119

In this paper, a space-time coded adaptive MQAM scheme with variable power is developed for MIMO system. Under the target BER and average power constraint, the optimum SNR switching thresholds for the developed scheme are generated by using the Lagrange method, which can make the scheme maximize the spectrum efficiency (SE). Besides, the closed-form expressions for the SE and average BER of the scheme are derived. Simulation results show that our scheme is superior to the corresponding constant-power space-time coded adaptive MQAM scheme. Moreover, the SE and average BER from theory computation accords with those from the simulation results.

关键词： Adaptive modulation space-time coding variable powe MQAM Spectrum efficiency

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Application on space-time coding Technology in Ultrasonic Back-propagation Method

Application on Space-time Coding Technology in Ultrasonic Ba...

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IEEE International Conference on Bioinformatics and Biomedicine (IEEE BIBM)

作者： He, Xiaonian Liu, Weixiang Chen, Siping Qin, Zhengdi Shenzhen Univ Natl Reg Key Technol Engn Lab China Med Ultrasoun Guangdong Prov Key Lab Biomed Informat Detect & U Dept Biomed EngnSch Med Shenzhen 518060 Peoples R China

ISBN: (纸本)9781479913091;9781479913107

When applying the space-time coding technique into the ultrasound imaging system, the signal-to-noise-ratio (SNR) can be improved. However when the space-time coding combines with the conventional synthetic aperture techniques can result some ghost images because the conventional synthetic aperture technique cannot suppress the axial direction of the side-lobe which emerges after pulse compression and thereby reducing the image quality. To solve the problem of ghost imaging, this paper introduces a new method, which combines the techniques of space-time coding and ultrasonic back-propagation synthetic aperture. The main idea of the method is that different locations using different coding pulse emission. It can be achieved by using the Truncated long code[1]. The synthetic aperture technique based on the ultrasonic back-propagation is then applied for processing the echo signals to further improve the SNR as well as suppress the axial side-lobe. The crosstalk among echo signals can also be reduced. Simulation shows positive results of the new method. Both detection sensitivity and robustness against noise are improved and overall performance of the image system is enhanced.

关键词： space-time coding back-propagation axial side-lobe SNR

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Telemetry Communication in Complex Attitude Conditions Based on space-time coding 28th

Telemetry Communication in Complex Attitude Conditions Based...

引用

28th Conference of spacecraft TT and C Technology in China - Openness, Integration and Intelligent Interconnection

作者： Zhu, Hongpeng Cai, Jun Li, Zhiqiang Xiang, Zhongwu PLA Univ Sci & Technol Nanjing 210000 Jiangsu Peoples R China

ISBN: (纸本)9789811048371;9789811048364

In order to improve the reliability of the aircraft telemetry communication in complex attitude conditions, a system model with concatenated LPDC space-time codes and a 2 × 1 antenna system is established. A channel parameter estimation method is introduced, and then a soft space-time decoding algorithm based on channel parameter estimation is proposed. The decoding algorithm gives soft output information to the LDPC decoder which can take full advantage of LDPC coding gain. Simulation result shows that there would be a poor error performance without space-time coding while the phase difference of signal from two antennas is in the vicinity of π. But with space-time coding, the reliability of communication in any phase difference could be guaranteed. © Tsinghua University Press, Beijing and Springer Nature Singapore Pte Ltd. 2018.

关键词： Complex attitude space-time coding Telemetry communication

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