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

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Performance of Space Time Coded Orthogonal Frequency Division multiplexing Schemes with Delay Spreads

Performance of Space Time Coded Orthogonal Frequency Divisio...

引用

IEEE Mediterranean Electrotechnical Conference

作者： Sokoya, O. Maharaj, B. T. CSIR Meraka Inst Site Bldg 43 ZA-0001 Pretoria South Africa Univ Pretoria Dept Elect Engn & Comp Engn ZA-0002 Pretoria South Africa

ISBN: (纸本)9781424416325

To combat the effect of intersymbol interference caused by frequency selectivity of fading channel in space time coding schemes, two main methods are employed, i.e. multichannel equalization and orthogonal frequency division multiplexing. The complexity of the multichannel equalization method restricts its use widely. Orthogonal frequency division multiplexing (OFDM) converts the frequency selective channel into parallel non-frequency selective subchannel and eliminates the intersymbol interference. This paper investigates using Monte Carlo simulations, the performance of known space time coding schemes in an OFDM environment with different channel delay spreads. Simulation results (i.e. frame error rate) show that Super-Orthogonal Space Time Code in an OFDM environment outperform other schemes (i.e. STTC-OFM and STBC-OFDM) with delay spreads incorporated.

关键词： super-orthogonal codes space-time codes frequency selective channel multiple-input multiple-output Orthogonal Frequency Division multiplexing

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Quantum evolutionary complex sphere decoder algorithm for MIMO systems

Quantum evolutionary complex sphere decoder algorithm for MI...

引用

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

作者： Ni Liangfang Du Sidan Anhui Univ Technol Sch Elect Engn & Informat Hudong Rd 59 Maanshan Anhui Peoples R China Nanjing Univ Dept Elect Sci & Engn Nanjing Jiangsu Peoples R China

ISBN: (纸本)9781424437092

Quantum evolutionary complex sphere decoder algorithm (QECSDA) is proposed. A brief analysis is then given to the theoretical basis and practical performance of signal detection in multiple-input multiple-output communication systems using QECSDA. The emulation results have shown that the proposed algorithm outperforms not only the zero-forcing (ZF) detector but also the ordered successive cancellation (OSIC) detector in both a symmetrical system and an asymmetrical system.

关键词： Quntum evolution complex sphere decoder ML detection multiple-input multiple-output

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Soft parallel decoding of per-antenna-coded MIMO systems

Soft parallel decoding of per-antenna-coded MIMO systems

引用

IEEE International Conference on Communications (ICC 2005)

作者： Mielczarek, B Krzymien, W Univ Alberta TRLabs Edmonton AB T6G 2V4 Canada

ISBN: (纸本)0780389387

In this paper, we consider a soft parallel decoding approach using probabilistic data association (PDA) algorithm for per-antenna-coded (PAC) transmission on multiple-input multiple-output (MIMO) channels. The proposed algorithm allows for decoding of layered signals in a variety of contexts: downlink and uplink in multi-user systems, single user transmission for both real-time and data traffic, systems with fewer receive than transmit antennas and with or without channel state information at the transmitter. We investigate performance of the proposed algorithm in turbo-coded MIMO systems using 16, 64, 256-QAM and spectral efficiencies ranging from 2 to 6 bpcu/layer. We present frame error rates for selected scenarios with the corresponding lower bounds on channel outage probabilities. We also briefly discuss the convergence properties of the PDA algorithm with turbo encoded signals.

关键词： probabilistic data association per-antenna-coding multiple-input multiple-output multi-user diversity M-QAM

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A Balanced Complexity and Performance User Clustering Scheme for Cell-Free Massive MIMO-NOMA Systems 59

A Balanced Complexity and Performance User Clustering Scheme...

引用

59th Annual IEEE International Conference on Communications (IEEE ICC)

作者： Xiong, Chengyin Yan, Zhiwei Li, Fei Li, Ting Song, Yunchao Gui, Guan Nanjing Univ Posts & Telecommun Sch Commun & Informat Engn Nanjing 210003 Peoples R China

ISBN: (纸本)9781728190549

User clustering presents a significant design challenge when implementing non-orthogonal multiple access (NOMA) in multiple-input multiple-output (MIMO) systems. To fully exploit the potential of power domain multiplexing and achieve better performance of NOMA, users must possess significant variations in their channel gains. Consequently, it becomes necessary to cluster users based on their distinct channel gain characteristics. However, using random user clustering often leads to suboptimal outcomes, while the exhaustive search method is burdened with exorbitant complexity. To achieve the balance between system performance and complexity, this paper proposes a user clustering scheme that relies on Jaccard coefficient, which is a measure of differences in user channels, ranging from 0 to 1. A value of 0 indicates complete dissimilarity, while a value of 1 indicates complete similarity. By calculating the Jaccard coefficient, we can identify users who are dissimilar to the centroid as a cluster. Additionally, a new power allocation algorithm is developed to maximize the sum spectral efficiency by employing successive convex approximations (SCA), taking into account both spectral efficiency and user quality of service. The simulation results demonstrate that the algorithm proposed for maximizing the sum spectral efficiency exhibits a higher convergence rate and can substantially enhance the sum spectral efficiency in comparison to the full power control (FPC) scheme.

关键词： multiple-input multiple-output non-orthogonal multiple access user clustering power optimization

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MIMO CHANNEL CAPACITY WITH POLARIZATION DIVERSITY AND POWER ALLOCATION TECHNIQUE

MIMO CHANNEL CAPACITY WITH POLARIZATION DIVERSITY AND POWER ...

引用

IEEE International Conference on Signal Processing and Communications

作者： Prayongpun, Nuttapol Raoof, Kosai Lab Grenoble Images Paroles Signal Automat GIPSA F-38402 St Martin Dheres France

ISBN: (纸本)9781424412358

This paper considers the use of 4 x 4 multiple-input multiple-output (MIMO) antenna arrays for improving the mutual information with and without polarization diversity. The authors focus on the benefits offered by a combination of spatial and polarization diversity techniques. In this paper, are taken in consideration the cases where the channel state information (CSI) is known or unknown to transmitter for low signal to noise ratios (SNR) in the presence of low and high spatial correlation. The cumulative distribution function (CDF) of the mutual information is studied. We also examine the impact of cross polarization discrimination (XPD) on the mean mutual information of MIMO systems.

关键词： multiple-input multiple-output Channel Capacity Spatial and Polarization Diversity Channel State Information

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On the Capacity of MIMO Channels with Outdated Channel State Information

On the Capacity of MIMO Channels with Outdated Channel State...

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International Conference on Industry, Information System and Material Engineering

作者： Li, Ying Zhu, YiJun Ma, Lan Zhu, Yao Zhengzhou Informat Sci & Technol Inst Zhengzhou Peoples R China Satellite Ground Stn Beijing Peoples R China

ISBN: (纸本)9783037850275

A multiple-input multiple-output (MIMO) time-varying flat fading channel is considered. The transmitter obtained the channel state information (CSI) relying on the reciprocity principle or by the feedback from the receiver. Thus, channel state information at the transmitter (CSIT) is outdated due to the delay between the estimation of the channel and the transmission of the data. In order to achieve the maximum channel capacity, the transmitter linearly precoded the signal before transmission based on the outdated CSIT. Under the assumptions of wide-sense stationary uncorrelated scattering Rayleigh fading channels and Jake's model, the instantaneous mutual information and ergodic capacity is derived for MIMO channels with outdated CSIT. The information outage probability of MIMO channel with outdated CSIT is also presented.

关键词： multiple-input multiple-output outdated channel state information capacity outage probability

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Frequency Reconfigurable Compact MIMO Antenna for WLAN application

Frequency Reconfigurable Compact MIMO Antenna for WLAN appli...

引用

International Symposium on Antennas and Propagation (ISAP)

作者： Kambali, Vijay Abegaonkar, Mahesh Basu, Ananjan Indian Inst Technol IIT Delhi Ctr Appl Res Elect New Delhi India

ISBN: (纸本)9781538604656

A frequency reconfigurable multiple-input multiple-output (MIMO) antenna for Wireless Local Area Network(WLAN) application is proposed. multiple-input multiple-output (MIMO) technology has been incorporated into wireless local area networks (WLANs) through the IFEE802.11n and 802.11ac standards. These AMMO WLAN systems can support up to four antenna elements and four data streams for each user or mobile station. These systems operate in the frequency hands of 2.4-2.5 GHz (802.11n) and 4.9-5.725 GHz. (802.11n and ac).

关键词： multiple-input multiple-output Frequency reconfigurable antenna WLAN

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A HYBRID MIMO PHASED-ARRAY CONCEPT FOR ARBITRARY SPATIAL BEAMPATTERN SYNTHESIS

A HYBRID MIMO PHASED-ARRAY CONCEPT FOR ARBITRARY SPATIAL BEA...

引用

13th IEEE Digital Signal Processing Workshop/5th IEEE Signal Processing Education Workshop

作者： Browning, J. Paul Fuhrmann, Daniel R. Rangaswamy, Muralidhar USAF Res Lab Wright Patterson AFB OH 45433 USA Michigan Technol Univ Dept Elect & Comp Engn Houghton MI 49931 USA

ISBN: (纸本)9781424436767

multiple-input multiple-output (MIMO) radar is a multiple aperture technology characterized by the ability to transmit diverse signals at each aperture. This is in contrast to traditional phased-array radar whereby a single signal is transmitted with a phase shift applied at each element to enable steering of the transmit beam. The hybrid MIMO phased-array radar (HMPAR) concept is an outgrowth of the monostatic MIMO construct, in which all sensors have the same view of the far-field target. In the HMPAR, the full transmit array is partitioned into sub-arrays which can be electronically steered in different directions and driven by separate transmit waveforms;furthermore the configuration of the array into sub-arrays can be changed. Here we explore the variety of transmit beampatterns that could be achieved using such a system.

关键词： multiple-input multiple-output beamforming radar

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Performance prediction of urban MIMO channels

Performance prediction of urban MIMO channels

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19th IEEE Canadian Conference on Electrical and Computer Engineering

作者： Downes, Garfield Willink, Tricia J. D'Amours, Claude Univ Ottawa SITE Ottawa ON K1N 6N5 Canada Commun Res Centre Ottawa ON K1N 6N5 Canada

ISBN: (纸本)9781424400379

Metrics obtained from a set of channel measurement data are used to predict performance of different MIMO techniques, such as spatial multiplexing and space-time block coding. For a given channel realisation, metries such as mutual information, eigenvalues, etc. can be extracted and the BER performance simulated for different MIMO techniques. By correlating the simulated BER performances to the metrics, it can be determined which metrics are useful BER performance predictors for a given MIMO technique. It is shown that mutual information and the eigenvalues of the spatial correlation matrix are useful BER predictors for V-BLAST and STBC techniques.

关键词： multiple-input multiple-output spatial multiplexing space-time block coding

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COMPUTING THE DEGREES OF FREEDOM FOR ARBITRARY MIMO INTERFERENCE CHANNELS

COMPUTING THE DEGREES OF FREEDOM FOR ARBITRARY MIMO INTERFER...

引用

IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Gonzalez, O. Lameiro, C. Via, J. Beltran, C. Santamaria, I. Univ Cantabria Dept Commun Engn E-39005 Santander Cantabria Spain Univ Cantabria Dept Stat & Computat Math E-39005 Santander Cantabria Spain

ISBN: (纸本)9781479903566

In this paper we provide an efficient procedure to compute the total number of degrees of freedom (DoF), achievable by linear beam-forming, of the K-user multiple-input multiple-output (MIMO) interference channel with an arbitrary number of Tx-Rx antennas at each link. Firstly, we derive an analytical outer bound that generalizes the results that exist for the symmetric K-user M x N interference channel. Secondly, we obtain a tighter bound by solving a convex optimization problem that includes as constraints the DoF characterizations for point-to-point MIMO links and for 2-user interference channels. The solution to this convex problem admits an interesting waterfilling interpretation. Finally, exploiting this outer bound and using a recently proposed feasibility test, we show that it is possible to obtain the DoF for any interference channel in an efficient way. Some simulations results are included to illustrate the tightness of the derived bounds, as well as to study the DoF achievable for the 4-user channel when we distribute the total number of antennas among users and between transmitters and receivers in different ways.

关键词： Degrees of freedom interference alignment multiple-input multiple-output convex optimization

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