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检索条件"主题词=multiple-input multiple-output"

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Few-mode fiber for optical MIMO transmission with low computational complexity

Few-mode fiber for optical MIMO transmission with low comput...

引用

Conference on Next-Generation Optical Communication - Components, Sub-Systems, and Systems II

作者： Sakamoto, T. Mori, T. Yamamoto, T. Yamamoto, F. NTT Corp NTT Access Network Serv Syst Labs Tsukuba Ibaraki 3050805 Japan

ISBN: (纸本)9780819494160

This paper introduces our recent results on mode-division multiplexing transmission with MIMO processing. We have been studying coherent optical MIMO transmission systems and developing few-mode fibers to reduce the complexity of MIMO processing, for example, by using multi-step index fibers to control the differential mode delay (DMD) of the fibers and to compensate for the total DMD. We also investigated a transmission system using reduced-complexity MIMO processing. Finally, we review our latest 2x2 WDM-MIMO transmission experiments with low MIMO processing complexity.

关键词： Few-mode fiber multiple-input multiple-output differential mode delay

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Ultra-Low Profile Tri-Polarized Antenna for WLAN/MIMO Application

Ultra-Low Profile Tri-Polarized Antenna for WLAN/MIMO Applic...

引用

International Symposium of IEEE-Antennas-and-Propagation-Society / USNC/URSI National Radio Science Meeting

作者： Payne, Komlan Choi, Jun H. Jang, Taehee Syracuse Univ Elect Engn & Comp Sci Syracuse NY 13244 USA JMA Wireless 7645 Henry Clay Blvd Liverpool NY 13088 USA

ISBN: (纸本)9781538632840

This paper presents a novel tri-orthogonal polarization antenna operating at 2.4 GHz with good prospective for WLAN and MIMO systems. The design is implemented by integrating dual polarized cross-slot antenna and zeroth-order resonant (ZOR) antenna. The total height of the antenna is 0.762 mm corresponding to 0.01 lambda(g) (where lambda(g) is the guide wavelength at 2.4 GHz). Linear horizontal dual-polarization and vertical polarization radiation patterns are obtained by using cross-polarized slot antennas and ZOR array antenna respectively. The broadside gain provided by the slot radiation is 5.3 dBi while the azimuthal average gain of the ZOR antenna is about 1.2 dBi.

关键词： Metamaterials multiple-input multiple-output polarization diversity slot antennas ZOR antennas

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Efficient Adaptive Equalization of Doubly Dispersive Channels in MIMO-FBMC/OQAM Systems 11

Efficient Adaptive Equalization of Doubly Dispersive Channel...

引用

11th IEEE International Symposium on Wireless Communications Systems (ISWCS)

作者： Mavrokefalidis, C. Rontogiannis, A. Kofidis, E. Beikos, A. Theodoridis, S. Comp Technol Inst & Press Diophantus Patras Greece Natl Observ Athens IAASARS GR-15236 Penteli Greece Univ Piraeus Dept Stat & Insurance Sci Piraeus Greece Univ Athens Dept Informat & Telecommun Athens Greece

ISBN: (纸本)9781479958634

The problem of adaptively equalizing doubly dispersive MIMO channels for FBMC/OQAM systems is studied in this paper. The challenges in this type of multicarrier systems include their intrinsic self-interference and the need to cope with time-and frequency-selective subchannels in realistic propagation conditions. An efficient and numerically stable algorithm is adopted, relying on a decision feedback structure that implements BLAST ordering for the input signals recovery. The ability of this algorithm to address the above challenges has been demonstrated. The focus of this paper is on reducing the needs of this equalizer in training information. A channel estimate-based (re-)initialization scheme is developed and shown to be quite effective in lowering the training overhead, at an affordable additional cost in complexity. For the sake of comparison, the MIMO-OFDM problem is also studied. Simulation results for practical scenarios demonstrate the effectiveness of the proposed approach.

关键词： Decision feedback equalization filter bank based multicarrier multiple-input multiple-output orthogonal frequency division multiplexing offset quadrature amplitude modulation recursive least squares

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Three-dimensional Space-Time Shift Keying with Coordinate Combination and Joint Optimisation

Three-dimensional Space-Time Shift Keying with Coordinate Co...

引用

IEEE/CIC International Conference on Communications in China (ICCC)

作者： Zheng, Guangtao Jiang, Ming Sun Yat Sen Univ Guangzhou Guangdong Peoples R China

ISBN: (纸本)9781509002436

In this paper, the concept of three-dimensional (3-D) space-time shift keying (STSK) is introduced, which incorporates 3-D constellations into conventional STSK systems. The new 3-D STSK techniques enjoy better error resilience than their two-dimensional (2-D) counterparts. Firstly, based on different sampling rates, two three-dimensional (3-D) STSK schemes referred to as R2 3-D STSK and R3 3-D STSK, respectively, are proposed. Both schemes show improved effective spectral efficiency (ESE) than 2-D STSK at relatively low signal-to-noise ratios (SNRs). Further, the optimal combinations of the constellation coordinates for R2 3-D STSK are derived by maximising the minimal determinant of the so-called difference matrices, yielding a better system performance. In addition, a joint optimisation mechanism utilising the simplified conjugate gradient (SCG) algorithm is devised for 3-D STSK, aiming for further enhancing the achievable system performance. Finally, extensive simulation results are provided to demonstrate the benefits of the proposed schemes, exhibiting the design tradeoffs concerning date rate, link robustness and computational complexity.

关键词： Three-dimensional constellation space-time shift keying multiple-input multiple-output coordinate combination joint optimisation

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Performance Evaluation of MIMO Systems with Transmit Antenna Selection over Correlated Rayleigh Fading Channels

Performance Evaluation of MIMO Systems with Transmit Antenna...

引用

69th IEEE Vehicular Technology Conference

作者： Xu, Rongtao Zhong, Zhangdui Chen, Jiann-Mou Beijing Jiaotong Univ State Key Lab Rail Traff Control & Safety Beijing Peoples R China Hwa Hsia Univ Technol Dept Assets & Property Management Taipei Taiwan

ISBN: (纸本)9781424425167

In this paper, we investigate MIMO systems with transmit antenna selection over an intra-class correlated Rayleigh fading channel. In our study, one single transmit antenna with an aim to maximizing the total received signal-to-noise ratio (SNR) is selected for transmission, while it is assumed that the receive side use all the available antennas. Using binary-phase-shift-keying (BPSK) modulation as an illustration, we derive the exact bit error rates (BERs) of two diversity schemes, namely transmit antenna selection and full complexity schemes. Moreover, we compare the asymptotic performance of the two diversity schemes analytically. The effect of correlation among the sub-channels on the SNR degradation is also determined in terms of the correlation coefficient and the number of transmit/receive antennas. Finally, results show that the transmit antenna selection scheme can achieve better performance than the full complexity scheme at the expense of a small amount of feedback information from the receiver.

关键词： multiple-input multiple-output transmit antenna selection intra-class correlation Rayleigh fading

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LoS MIMO-Arrays vs. LoS MIMO-Surfaces 17

LoS MIMO-Arrays vs. LoS MIMO-Surfaces

引用

17th European Conference on Antennas and Propagation (EuCAP)

作者： Di Renzo, Marco Dardari, Davide Decarli, Nicolo Univ Paris Saclay CNRS Cent Supelec Lab Signaux & Syst F-91192 Gif Sur Yvette France Univ Bologna Dept Elect Elect Informat Engn DEI I-40126 Bologna Italy Italian Natl Res Council Inst Elect Comp Telecommun Engn I-40136 Bologna Italy

ISBN: (纸本)9788831299077

The wireless research community has expressed major interest in the sub-terahertz band for enabling mobile communications in future wireless networks. The sub-terahertz band offers a large amount of available bandwidth and, therefore, the promise to realize wireless communications at optical speeds. At such high frequency bands, the transceivers need to have larger apertures and need to be deployed more densely than at lower frequency bands. These factors proportionally increase the far-field limit and the spherical curvature of the electromagnetic waves cannot be ignored anymore. This offers the opportunity to realize spatial multiplexing even in line-of-sight channels. In this paper, we overview and compare existing design options to realize spatial multiplexing in line-of-sight multi-antenna channels.

关键词： Sub-terahertz line-of-sight multiple-input multiple-output metamaterials holographic surfaces

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A novel wideband MIMO channel model and the wideband MIMO software defined radio

A novel wideband MIMO channel model and the wideband MIMO so...

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2nd IEEE International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM 2006)

作者： Costa, Nelson Haykin, Simon McMaster Univ Dept Elect & Comp Engn Hamilton ON Canada

ISBN: (纸本)9781424405169

In the following, we present a novel wideband multiple-input, multiple-output (MIMO) channel model. The model is based on the Eigenvalue Decomposition (EVD) of the wideband channel correlation matrix. It does not assume the scatterers at the receiver fade independently of those at the transmitter. It also models correlation between delay bins in the Power Delay Profile (PDP). With preliminary data gathered using the Wideband MIMO Software Defined Radio (WMSDR) in fixed outdoor locations, we show good agreement between modeled and measured data.

关键词： MIMO wideband channel modeling channel capacity measured channel data antenna arrays multiple-input multiple-output

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Efficient design of symbol detector for MIMO-OFDM based wireless LANs

Efficient design of symbol detector for MIMO-OFDM based wire...

引用

IEEE International Conference on Telecommunications/IEEE Malaysia International Conference on Communications (ICT-MICC 2007)

作者： Lee, Seongjoo Noh, Seungpyo Jung, Yunho Kim, Jaeseok Sejong Univ Dept Informat & Commun Engn Seoul South Korea LG Elect Mobile Commun Lab Anyang South Korea Yonsei Univ Dept Elect & Elect Engn Seoul South Korea

ISBN: (纸本)9781424410934

In this paper, we propose an efficient symbol detection algorithm and its hardware architecture for MIMO-OFDM system with two-transmit and two-receive (2x2) antennas. The detector supports two MIMO-OFDM schemes, SFBC-OFDM and SDM-OFDM, in order to achieve higher performance and throughput. However, symbol detection processes for these two schemes have high computational complexity, which is a burden to hardware implementation of MIMO-OFDM symbol detectors. In order to reduce the complexity, we propose a cost-efficient algorithm for SDM-OFDM and novel hardware architecture for MIMO-OFDM symbol detectors. The proposed detector with shared-architecture, where similar functional blocks are merged and share the hardware resources, can be used for not only SDM-OFDM but also SFBC-OFDM systems. The proposed symbol detector reduces the logic gates by 54% and the occupation ratio by 12.8% compared to a conventional symbol detector employing two individual detectors. Therefore, the proposed symbol detector will be a vast contribution to the low complexity design of MIMO-OFDM systems, since the MIMO-OFDM symbol detector is one of the largest modules in the systems,, in which the low complexity design is a very important issue.

关键词： multiple-input multiple-output symbol detection space-frequency block coded OFDM space division multiplexing OFDM

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Terrestrial Broadcast Technologies for Next Generation Broadcast Wireless Systems

Terrestrial Broadcast Technologies for Next Generation Broad...

引用

IEEE International Conference on Communications (ICC)

作者： Kou, Yajun Wang, Fang Tian, Jinfeng Zhang, Wenjun Guan, Yunfeng He, Dazhi Shi, Yijun Chinese Acad Sci Shanghai Adv Res Inst Shanghai Peoples R China Shanghai Jiao Tong Univ Inst Image Commun & Network Engn Shanghai Peoples R China

ISBN: (纸本)9781467363051

The next generation broadcast wireless (NGB-W) system is aimed to provide high-speed, ubiquitous, and secure tri-play services to massive users. In this paper, a new terrestrial broadcast solution for the NGB-W system is proposed. The system and the key techniques of the proposed solution are introduced. The performance of the proposed solution is evaluated by simulations. It is shown that the performance of the proposed solution is better than that of the second generation terrestrial broadcast systems of Digital Video Broadcasting (DVB).

关键词： NGB-W terrestrial broadcast low-density parity check code bit-interleaved coded modulation multiple-input multiple-output carrier aggregation

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A Particle Filter for Frequency Synchronization in MIMO-OFDM Systems

A Particle Filter for Frequency Synchronization in MIMO-OFDM...

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5th International Conference on Wireless Communications, Networking and Mobile Computing

作者： Zhang Jing Luo Han-wen Jin Rong-hong Zhang Jing Shanghai Jiao Tong Univ Dept Elect Engn Shanghai 200030 Peoples R China Shanghai Normal Univ Dept Commun Engn Shanghai Peoples R China

ISBN: (纸本)9781424436927

A particle filter algorithm is investigated to perform joint estimation of carrier frequency offset (CFO) and channel in multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) wireless communication systems. The filter marginalizes out the channel parameters from the sampling space in sequential importance sampling, and propagates them with the Kalman filter. Then the importance weights of CFO particles are evaluated according to the imaginary part of error between measurement and estimate. Moreover, the varieties of particles are maintained by sequential importance resampling. Simulations demonstrate the algorithm can estimate the CFO and channel with high accuracy, as well as has some robustness to the channel model variation.

关键词： frequency offset orthogonal frequency division multiplexing multiple-input multiple-output channel estimation sequential Monte Carlo particle filter

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