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检索条件"主题词=space-time coding"

共 732 条记录，以下是101-110 订阅

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Information lossless space-time coding for multiple access systems

Information lossless space-time coding for multiple access s...

引用

32nd IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Fasano, Antonio Barbarossa, Sergio Univ Roma La Sapienza INFOCOM Dept Via Eudossiana 18 I-00184 Rome Italy

ISBN: (纸本)1424407281

In this paper we consider multiple access systems where users and access point are equipped with multiple antennas. In order to exploit some of the MIMO potentials we have to resort to space-time coding. Unfortunately, such a processing may induce severe loss in terms of achievable information rates. In this paper we prove the necessary and sufficient condition ensuring that the space-time coding is information lossless, in the sense that it does not induce any modification in certain regions of achievable rates. In particular information lossless property is guaranteed if each user makes use of a Trace-Orthogonal Design (TOD), that is a linear space-time code whose encoding matrices are orthogonal with respect to the trace inner product. Noteworthy, users can also use the same set of encoding matrices.

关键词： MIMO systems multiple access channel space-time coding information lossless

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Digital Watermarking Algorithm Based on space-time coding

Digital Watermarking Algorithm Based on Space-Time Coding

引用

2010 Symposium on Security Detection and Information Processing

作者： Zhang, Fan Zhang, Xinhong Li, Rui Henan Univ Coll Comp & Informat Engn Kaifeng 475001 Peoples R China Henan Univ Inst Image Proc & Pattern Kaifeng 475001 Peoples R China

Theories of spread spectrum communications, channel coding, capacity analysis techniques have been widely applied in digital watermarking research. In recent years, communication theory has made an important technological breakthrough. The next generation mobile communication systems (4G) is far exceeding the capacity needs of the traditional Shannon channel capacity limit, and this need promotes the rapid development of multiple-input multiple-output (MIMO) technology. The combination of space-time coding and MIMO technology will breakthrough the capacity limit of single-input single-output (SISO) channel. In this paper, the digital image watermarking system is extended from SISO to MIMO systems based on space-time coding and MIMO communication theory. The new watermarking algorithm is designed in the new framework of space-time coding and MIMO-based communication theory. The watermark capacity and the detection error rate also are further studied under the conditions of different space-time coding. These studies will provide a new idea for the design of new digital watermarking algorithm. (c) 2010 Published by Elsevier Ltd.

关键词： digital image processing digital watermarking MIMO space-time coding

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Adaptive space-time coding and its implementation in MIMO antenna systems

Adaptive space-time coding and its implementation in MIMO an...

引用

7th IEEE International Symposium on Signal Processing and Information Technology

作者： Lee, J. R. Ahmed, Mohamed H. Soma Networks Inc Ottawa ON Canada Mem Univ Newfoundland Fac Engn St John NF A1C 5S7 Canada

ISBN: (纸本)9781424418343

The introduction of Multiple-Input Multiple-Output (MIMO) opened the door for space-time processing (STP) techniques to improve the transmission reliably and spectral efficiency. STP algorithms have been mainly proposed to achieve either enhancement in the link quality (through spatial diversity) or throughput gain (through spatial multiplexing). The simultaneous enhancement of link reliability and throughput gain are competing performance objectives. In addition, the performance of either of these methods is highly dependent on the MIMO channel conditions. If the MIMO channel is spatially uncorrelated it is known to be well conditioned to achieve spatial multiplexing gain On the other hand, if the MIMO channel is spatially correlated, it is much less able to support spatial multiplexing;hence, performance can be improved through spatial diversity. This paper presents an adaptive layered space-time (LST) processing method. The proposed scheme is shown to be able to adopt to a broad range of MIMO channel environments, providing a significant performance improvement over the conventional non-adaptive STP methods. Furthermore, we discuss some implementation issues of the proposed scheme.

关键词： space-time coding MIMO antennas adaptive systems

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Performance of Complex Orthogonal Wavelet Packet Based MC-CDMA System with space-time coding over Rayleigh Fading Channel

Performance of Complex Orthogonal Wavelet Packet Based MC-CD...

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IITA International Conference on Control, Automation and Systems Engineering

作者： Yu, Xiangbin Bi, Guangguo Nanjing Univ Aeronaut & Astronaut Coll Informat Sci & Technol Nanjing 210016 Peoples R China Southeast Univ Natl Mobile Commun Res Lab Nanjing Peoples R China

ISBN: (纸本)9780769537283

space-time coding technique and Multi-carrier CDMA (MC-CDMA) technique have been research hotspots due to their high frequency spectrum efficiency and high data rata transmission. On the basis of analyzing the two technique principle, by the use of the optimized complex orthogonal wavelet packet and space-time coding technique, we propose a complex orthogonal wavelet packet based MC-CDMA system with space-time coding, and investigate the system bit error rate performance over Rayleigh fading channel. Theoretical analysis and simulation results show that the proposed complex wavelet packet based MC-CDMA (CWP-MC-CDMA) system outperforms conventional MC-CDMA system and it is slightly superior to the conventional MC-CDMA with cyclic prefix (CP). Without any CP, the system has much higher spectrum efficiency. Especially, the application of space-time coding technique significantly improves the system ability to combat channel fading and various interference. Moreover, the space-time coded CWP-MC-CDMA system has comparative superiority to space-time coded MC-CDMA with CP.

关键词： Multi-carrier CDMA complex wavelet packet space-time coding multi-input and multi-output (MIMO)

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Adaptive Beamforming Based on space-time coding Metasurface Antenna with Hadamard Codes 15

Adaptive Beamforming Based on Space-Time Coding Metasurface ...

引用

15th Global Symposium on Millimeter-Waves & Terahertz (GSMM)

作者： Fang, Zuqi Southeast Univ State Key Lab Millimeter Waves Nanjing Peoples R China

ISBN: (纸本)9798350384963;9798350384956

A novel adaptive beamforming method utilizing the space-time coding metasurface and Hadamard codes is presented. By the modulation of the signal received by each element, the sum modulated signal can be received by single receiver. Then, the sum signal is used to reproduce each element's received signal. Ultimately, the reproduced signals are employed in adaptive beamforming, with the weighting vectors obtained from the traditional adaptive beamforming algorithm. Compared with the traditional adaptive beamforming method with digital array, the proposed method requires only single receiver, which greatly simplifies the receiver structure. In the end, the simulation proves the feasibility of the proposed adaptive beamforming method.

关键词： Beamforming space-time coding orthogonal codes metasurface

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A space-time coding scheme with maximum diversity gains over frequency-selective fading channels

A space-time coding scheme with maximum diversity gains over...

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14th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

作者： Chen, SP Yao, TR S Cent Univ Nationalities Dept Elect & Informat Engn Wuhan 430074 Hubei Peoples R China

ISBN: (纸本)7505350668

We introduce a novel space-time coding scheme, called space-time cyclic-delay coding (STCDC), for multiple input multiple output orthogonal frequency-division multiplexing (MIMO-OFDM) systems over frequency-selective fading channels. The scheme exploits the redundancy introduced by channel coding. The transmitter antennas send the cyclically delayed copies of OFDM symbols, and the receiver uses the maximum likelihood estimation method to estimate the transmitted sequence. We show that STCDC-OFDM can achieve the maximum diversity, which is the product of the number of transmitter antennas the number of receiver antennas (N-r) and the channel length (L), if the error control code has at least a free distance of NrL. Compared with the existing space-time coding and space-frequency coded MIMO-OFDM techniques, the proposed scheme has the advantages of being independent from the number of transmit antennas and having a lower implementation complexity.

关键词： cyclic delay coding OFDM diversity space-time coding space-frequency coding

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Embedded space-time coding for wireless broadcast

Embedded space-time coding for wireless broadcast

引用

Conference on Visual Communications and Image Processing 2002

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

ISBN: (纸本)0819444111

An embedded space-time coding method is proposed for wireless broadcast applications. In the proposed system, a transmitter sends out multi-layer source signals by encoding different layers with different space-time codes. Then, the receiver can retrieve different amount of information depending on the number of antennas. The receiver with only one antenna can decode only the base layer information with a low complexity, while the receiver with more antennas can retrieve more layers of information. We derive an analytic bound on the error probability, and show both analytic and experimental results in this work.

关键词： space-time coding multi-resolution broadcast scalable encoding

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Make-It-Real-And-Anticirculating Orthogonal space-time coding for MIMO OFDM/OQAM 16

Make-It-Real-And-Anticirculating Orthogonal Space-Time Codin...

引用

16th IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)

作者： Phan-Huy, Dinh-Thuy Siohan, Pierre Helard, Maryline Orange Labs Issy Les Moulineaux France UEB IETR INSA Rennes France

ISBN: (纸本)9781479919314

We propose an orthogonal and full rate MIMO space-time coding technique for OFDM/OQAM, called 'make-it-real-and-anticirculating' (MIRAAC), to perform energy efficient wireless data transmission. The equivalent MIMO channel (after space-time coding, propagation and decoding) is made real and anticirculating, so that the receiver can suppress all interference very simply: just by extracting the real part of the received signal. Our simulations show that large antenna arrays (like those being studied for the future 5th generation networks) save a great amount of energy.

关键词： component OFDM/OQAM MIMO space-time coding maximum ratio transmission

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Reduced Complexity space-time coding in Single-Frequency Networks

Reduced Complexity Space-Time Coding in Single-Frequency Net...

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IEEE Wireless Communications and Networking Conference (WCNC)

作者： Polonen, Keijo Koivunen, Visa Aalto Univ SMARAD CoE Dept Signal Proc & Acoust Sch Elect Engn FI-00076 Aalto Finland

ISBN: (纸本)9781612842547

Mobile broadcasting MIMO systems differ in several essential ways from conventional MIMO applications, especially when they are operating in single-frequency networks. There are certain channel features, like the imbalance of received average powers, which should be taken into account in system design. In this paper, space-time coding that allows reduced complexity maximum likelihood decoding of the received signal in a single-frequency network is introduced. A novel optimization criterion for fast-decodable 4x2 structures is proposed and the performance in single-frequency networks is studied in different scenarios through simulations. It is noticed that the reduced complexity codes suffer only a fraction of a decibel performance loss compared to an earlier proposed alternative for digital video broadcasting while achieving significant savings in computational complexity when maximum likelihood decoding is applied.

关键词： digital video broadcasting MIMO single-frequency networks space-time coding

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SCFDE with space-time coding for IM/DD Optical Wireless Communication

SCFDE with Space-Time Coding for IM/DD Optical Wireless Comm...

引用

IEEE Wireless Communications and Networking Conference (WCNC)

作者： Acolatse, K. Bar-Ness, Y. Wilson, Sarah Kate New Jersey Inst Technol Ctr Wireless Commun & Signal Proc Newark NJ 07102 USA Santa Clara Univ Santa Clara CA 95053 USA

ISBN: (纸本)9781612842547

Recently, we proposed a novel transmission scheme termed decomposed-quadrature optical single carrier frequency domain equalization (DQO-SCFDE) suitable for intensity-modulated direct-detection (IM/DD) diffuse optical wireless (DOW) communication. DQO-SCFDE has been shown to perform better than the conventional asymmetrically clipped optical OFDM (ACO-OFDM) when the non-linearity characteristics of the light emitting diodes (LED) are considered. In this paper we present a detail comparison of DQO-SCFDE and ACO-OFDM. We then propose a space-time coding scheme for DQO-SCFDE using two LED's at the transmitter to improve the bit-error rate performance.

关键词： DQO-SCFDE Encoding IM-DD optical wireless communication Light emitting diodes Nonlinear optics OFDM Optical distortion Optical receivers Optical transmitters asymmetrically clipped optical OFDM bit-error rate performanceimprove the decomposed-quadrature optical single carrier frequency domain equalization error statistics intensity modulation intensity-modulated direct-detection diffuse optical wireless communication light emitting diodes light emitting diodes optical fibre communication radiocommunication space-time codes space-time coding transmitter

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