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检索条件"主题词=Space-time coding"

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Performance analysis of space-time coding with imperfect channel estimation 6

Performance analysis of space-time coding with imperfect cha...

引用

6th IEEE International Conference on Personal Wireless Communications

作者： Garg, P Mallik, RK Gupta, HM Indian Inst Technol Dept Elect Engn New Delhi 110016 India

ISBN: (纸本)0780375696

We analyze the error performance of a space-time coding system using N transmit and M receive antennas with imperfect channel estimation in flat Rayleigh fading. A least-squares estimate of the channel matrix is obtained by using a sequence of pilot code vectors. The estimate is found to be perturbed by an M x N perturbation matrix with zero-mean circular Gaussian entries. Using the characteristic function of the decision variable, we derive a closed-form expression for the pairwise error probability (PEP). From the same expression, the PEP in case of perfect channel estimation is also obtained. Numerical results show the degradation in performance due to imperfect channel estimation that can be compensated by increasing the number of receive antennas.

关键词： imperfect channel estimation pairwise error probability pilot code vectors Rayleigh fading space-time coding

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4 x 2 MIMO Field Test of Advanced SFN Using space-time coding For 8K Transmission

4 x 2 MIMO Field Test of Advanced SFN Using Space-Time Codin...

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11th IEEE International Symposium on Broadband Multimedia Systems and Broadcasting (BMSB)

作者： Saito, Susumu Shitomi, Takuya Asakura, Shingo Satou, Akihiko Okano, Masahiro Murayama, Kenichi Tsuchida, Kenichi Japan Broadcasting Corp NHK Sci & Technol Res Labs STRL Tokyo Japan

ISBN: (纸本)9781467390446

Japan Broadcasting Corporation (NHK) is aiming to broadcast ultra high definition television (UHDTV), such as 8K, terrestrially. To evaluate a next-generation terrestrial network, two experimental stations composed of an advanced single frequency network (SFN) using space-time coding technology were set up in the Hitoyoshi area of Kumamoto, Japan. The transmission capacity of each experimental station is a maximum of 91.8 Mbps when using dual-polarized multi-input multi-output (MIMO) and 4096QAM modulation. To evaluate an advanced SFN with a 4 x 2 MIMO system, we conducted experiments in a field test in the Hitoyoshi area to compare three SFN schemes: conventional SFN without coding, space-time coding (STC), and space-frequency coding (SFC). The results of the field tests show that the required received power of the STC-SFN and SFC-SFN are lower than those of the conventional SFN, and the amount of improvement averaged 2 dB. In this paper, we report on this field test.

关键词： UHDTV 8K SFN space-time coding 4 x 2 MIMO dual-polarized MIMO

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Wireless Robotics: Generalization of an Efficient Approach with Multi-h CPM Signaling and L2-Orthogonal space-time coding

Wireless Robotics: Generalization of an Efficient Approach w...

引用

Strategic Workshop

作者： Hisojo, Miguel Angel Lebrun, Jerome Deneire, Luc Univ Nice Sophia Antipolis CNRS F-06903 Sophia Antipolis France

Wireless Robotics has become an important research topic in the last two decades. The need of controlling a robot to perform tasks remotely has significantly increased with the number of applications in fields like medicine and military, among many others. Taking advantage of current standards like Bluetooth and Wifi, Wireless Robotics calls for low power consumption components, robustness and high data rate through the wireless channel. This call can be fulfilled with a reliable signaling format, satisfying the needs of low power consumption and high spectral efficiency. Besides, continuous phase modulation (CPM) has gained increasing attention due to its favorable trade-off between power and bandwidth efficiency. Multi-h CPM recently appeared as a generalization of single-h schemes so as to further decrease the need for bandwidth expansion over the wireless channel. Despite the interesting characteristics of CPM, the decoding of the received signal is particularly difficult in a multi-path wireless environment with no diversity. To provide some level of diversity, several authors have proposed to combine CPM with space-time block coding. A new family of codes for CPM, based on -orthogonality was recently introduced in Hesse et al. (IEEE Trans Commun 59(11): 3158-3166, 2011). These full rate codes achieve full diversity and a low decoding complexity. In this paper, we detail a non trivial extension of these -orthogonal space-time codes using multi-h signaling schemes. These new codes still achieve full diversity but a better spectral compactness by utilizing the available communication bandwidth more efficiently. Also, the decoding complexity is greatly decreased by using only one correlation filter bank for the detection of all transmitted signals.

关键词： Wireless Robotics space-time coding Continuous phase modulation L2-Orthogonal design Multi-h CPM Diversity Decoding complexity

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The Research of space-time coding Technology 7

The Research of Space-time Coding Technology

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7th International Conference on Modelling, Identification and Control (ICMIC)

作者： Ning, Hu Bo Mei, Wang Hebei Univ Sci & Technol Coll Informat Sci & Engn 26 Yu Xiang St Shijiazhuang Hebei Peoples R China

ISBN: (纸本)9780956715753

The next generation of mobile communication can increase the data transfer rate in the limited bandwidth of high-capacity transmission. The space-time coding technique is the important technology to solve the bandwidth problem based on OFDM (orthogonal frequency division multiplexing), it can take full advantage of multi-scattering wireless channel which caused by multipath environment by enhancing the ability of anti-fading. In this paper, the space-time coding techniques have been studied, three kinds of space-time coding principle of encoding and decoding have been analyzed. By comparing the complexity of the decoding and improving of space-time block coding, a new coding method - a new space-time block coding is proposed. And the simulation shows that the performance of the improved space-time coding system and the code rate are significantly improved.

关键词： space-time coding NSTBC MATLAB simulation

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Multi-bursts space-time coding for active antenna systems

Multi-bursts space-time coding for active antenna systems

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International Radar Conference

作者： Desodt, Guy Michel, Georges-Edouard Guyvarch, Jean-Paul Le Chevalier, Francois Rabaste, Olivier THALES AIR SYST La Defense France Off Natl Etud & Rech Aerosp Palaiseau France

ISBN: (纸本)9781479941957

This paper proposes to transmit colored codes varying from burst to burst, with the same angular coverage, and to fuse the signals they produce over the different bursts. If the ambiguity functions of the colored codes have high sidelobes in different areas, a fusion process like a "K over N" criterion produces a global ambiguity function with reduced sidelobes while the main lobe keeps its narrow beam width (ratio 1/root 2 on each axis, compared to a non-colored waveform). As an example, the fused codes can be non-colored, adjacent sub-bands, circulating codes or optimized phase codes. In this paper, a global ambiguity function is computed in the case of a 2-D active array antenna made of 4x4 transmit sub-arrays, and full Digital Beam Forming at Receive. 5 colored waveforms (non-colored, circulating codes, optimized codes) are fused by a criterion "3 over 5". This case demonstrates the multi-colored signals fusion can reduce the ambiguity function sidelobes by more than 10 dB while keeping the main lobe as narrow as from a single colored waveform.

关键词： space-time coding radar waveforms ambiguity function MIMO MISO colored transmission sidelobes reduction

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Continuous Phase Modulation and space-time coding: A Candidate for Wireless Robotics

Continuous Phase Modulation and Space-Time Coding: A Candida...

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Strategic Workshop

作者： Deneire, Luc Lebrun, Jerome Lab I3S Sophia Antipolis France Univ Nice Sophia Antipolis CNRS F-06903 Sophia Antipolis France

The physical layer(s) of wireless robotics take advantage of current standards, like Bluetooth, Wifi, etc., each of them addressing a specific segment of wireless robotics. Wireless robotics has a wide range of needs, comprising low power, robustness and high data rate when video is used as well as the opportunity to use a large number of transceivers. To cover these needs and take benefit from these opportunities, we propose a new physical layer, based on continuous phase modulation (CPM) and space-time coding. CPM, already used in some standards like GSM and Bluetooth, enables the development of low power devices, but presents a low spectral efficiency. space-time coding on the other hand yields high spectral efficiency as well as enhanced robustness against the wireless channel. Moreover, space-time coding can take benefit of the large number of transceivers using cooperative communications. In this paper, after analysing the opportunities given by wireless robotics as well as its specific needs, we propose a new physical layer based on L-2-orthogonality for non-linear space-time codes. L-2-orthogonality of our codes is ensured by a bank of phase correction functions, maintaining phase continuity, but at the same time enabling low complexity decoding. We show that the code achieves full diversity and has full rate, for any number of transmit/receive antennas and any CPM parameter.

关键词： space-time coding Continuous phase modulation Physical layer

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A low complexity iterative receiver for multiuser space-time coding system

A low complexity iterative receiver for multiuser space-time...

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6th International Conference on Wireless Communications, Networking and Mobile Computing (WICOM)

作者： Du Na Cao Ning Gu Pin-biao Hohai Univ Comp & Informat Coll Nanjing 210098 Jiangsu Peoples R China Southeast Univ Sch Informat Sci & Engn Nanjing 210096 Jiangsu Peoples R China

ISBN: (纸本)9781424437092

In multiuser space-time coding system the research already made is almost focused on STTC and STBC scheme. For this reason, a multiuser space-time coding system combined with Turbo-BLAST scheme is investigated. Iterative processing has been shown to be very effective in multiuser space-time coding systems, where each user employs channel coding and iterations are performed between the soft-output channel decoders. The complexity of an iterative receiver depends heavily on how the log-likelihood ratios (LLRs) are computed for users' coded bits in order to implement the iterations. The bit-level cancellation (BLC) scheme is proposed in this paper to ease the computation of the LLRs and allow bit-level interference cancellation in the iterative processing. It is demonstrated that the proposed iterative receiver performs very close to the conventional one, but with a much less computational complexity. Also the high spectral efficiency of the system from BLAST is retained.

关键词： space-time coding Turbo-BLAST iterative receiver soft interference cancellation bit-level cancellation

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Achieving High Reliability in Aerial-Terrestrial Networks: Opportunistic space-time coding

Achieving High Reliability in Aerial-Terrestrial Networks: O...

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European Conference on Networks and Communications (EuCNC)

作者： Jiang, Wei Cao, Hanwen Wiemeler, Michael Kaiser, Thomas Univ Duisburg Essen UDE Inst Digital Signal Proc DSV D-47057 Duisburg Germany

ISBN: (纸本)9781479952809

To rapidly deploy a communication network in the aftermath of disaster or emergency event, an Aerial-Terrestrial architecture integrating aerial base stations mounted on the balloons has been investigated in EU FP7 ABSOLUTE project. Since the signal coverage provided by aerial base stations is patchy and unstable, the opportunistic relaying is applied to increase the link reliability and the system robustness. However, the performance of relay selection drastically degrades due to the outdated Channel State Information (CSI) from the feedback delay over the Aerial-to-Terrestrial radio channels. In this paper, therefore, we present a novel method named opportunistic space-time coding (OSTC) to combat the outdated CSI. The link reliability in terms of outage probability is evaluated using both Rayleigh channels and the realistic models of Aerial-to-Terrestrial and Device-to-Device channels. The numerical results reveal that OSTC obviously outperforms the opportunistic relaying in the presence of outdated CSI. Moreover, the improvement of reliability comes without any sacrifice in the spectral efficiency.

关键词： BASE STATION space-time coding Terrestrial network Raleigh fading channels networks(communications) Balloon Device Component relaying spectral efficiency time coding Disasters ANTENNA

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Spatial Modulation in Layered space-time coding for Image-Sensor-Based Visible Light Communication 27

Spatial Modulation in Layered Space-Time Coding for Image-Se...

引用

27th IEEE Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)

作者： Masuda, Keisuke Kamakura, Koji Yamazato, Takaya Chiba Inst Technol Dept Comp Sci 2-17-1 Tsudanuma Narashino Chiba 2758588 Japan Nagoya Univ Inst Liberal Arts & Sci Chikusa Ku Furo Cho Nagoya Aichi 4648603 Japan

ISBN: (纸本)9781509032549

Spatial modulation (SM) is introduced into layered space-time coding (L-STC) used in image sensor (IS)-based visible light communication (VLC) systems. STC was basically investigated for extending the communication range of the IS-based VLC link [1], although it is out of the range when IS receivers are at the long distance from the LED array of the transmitter where the number of pixels capturing the transmitter on the image plane is less than the number of LEDs of the array. Furthermore, L-STC was done in [2] for increasing the reception rate with improving the pixel resolution while the receiver was approaching the transmitter. In this paper, SM is combined into L-STC by mapping additional information bits on the location of the pair of STC bit matrices of each layer. Experimental results show that additional SM bits are extracted with no error, without deteriorating the reception quality of and shrinking the transmission range of the original L-STC.

关键词： Spatial modulation space-time coding Visible light communication Layered STC Image sensor

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Embedded differential space-time coding for wireless broadcast

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

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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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