1,735 Hits in 8.2 sec

Benefits of Spatial Correlation for Multi-Antenna Non-Coherent Communication over Fading Channels at Low SNR

Wenyi Zhang, J. Laneman
2007 IEEE Transactions on Wireless Communications  
For fading channels without channel state information (CSI) at the transmitter or the receiver, fundamental challenges arise for realizing efficient communication, especially under stringent constraints  ...  To mitigate these challenges, in this paper we investigate the benefits of spatial correlation among multiple transmit and receive antennas.  ...  The authors of [18] address some general issues of spatial correlation in non-coherent block-fading channels, indicating that at least for block length one, i.e., memoryless fading, spatial correlation  ... 
doi:10.1109/twc.2007.04634 fatcat:vw4aheh6ang3le7icxlutr34le

Investigation of Correlated Rayleigh Fading Channel with Alamouti's STBC-MRC system

Tanvir Ahmed, Md. Shamim Anower, Md. Zahurul Islam Sarkar, Md. Mortuza Ali
2013 International Journal of Advanced Science and Technology  
The effect of antenna diversity for a double transmit and multiple receive antenna supported wireless communication system is investigated, that employs multi user Alamouti's space time block coding (STBC  ...  Additive White Gaussian Noise (AWGN) and Correlated Rayleigh Fading Channels.  ...  In [12] performance analysis of maximal ratio combining (MRC) using BPSK modulation in spatially correlated Rayleigh fading channels with imperfect channel knowledge are presented in terms of antenna  ... 
doi:10.14257/ijast.2013.58.06 fatcat:2eariupcdnecjeq5rpk74an62m

802.11 with multiple antennas for dummies

Daniel Halperin, Wenjun Hu, Anmol Sheth, David Wetherall
2010 Computer communication review  
It is responsible for superior performance, reliability and range. In this tutorial, we provide a brief introduction to multiple antenna techniques.  ...  The use of multiple antennas and MIMO techniques based on them is the key feature of 802.11n equipment that sets it apart from earlier 802.11a/g equipment.  ...  Acknowledgments The authors would like to thank Romit Roy Choudhury, Michael Piatek, Peter Steenkiste, and Matt Tierney for their helpful comments and suggestions.  ... 
doi:10.1145/1672308.1672313 fatcat:nourl3pug5ckxohwfqxc7lz3re

Mobility Aspects of Physical Layer in Future Generation Wireless Networks [chapter]

Asad Mehmood, Abbas Mohamme
2011 Advances in Vehicular Networking Technologies  
The demand from social market for high speed broadband communications over wireless media is pushing the requirements of both the mobile and fixed networks.  ...  Users have experienced an incredible reduction in telecommunications charges and they now anticipate receiving higher quality communication services at low cost.  ...  Low value of correlation can be achieved when inter-antenna spacing is kept large.  ... 
doi:10.5772/16035 fatcat:2sqzlwy7fzhthor4kkfxwqmndu

Analysis and Evaluation of Performance Gains and Tradeoffs for Massive MIMO Systems

Saba Jabbar, Yu Li
2016 Applied Sciences  
An increase in the energy efficiency means that the received SNR is increased from the coherent combining of the signals toward where users are located.  ...  At the uplink side, K-users send K-orthogonal pilot sequences to the base station for estimating the channels, while at the downlink side, using the concept of channel reciprocity base station utilizes  ...  I would like to express my grateful and thankful to the Chinese Scholarship Council (CSC) for support and give me the opportunity to study at China.  ... 
doi:10.3390/app6100268 fatcat:evqc5lgssrcwnhroic6a4evccy

Spectral Efficiency of Massive MIMO Communication Systems with Zero Forcing and Maximum Ratio Beamforming

Asif Ali, Imran Ali, Abdul Latif, Sajjad Ali, Erum Saba
2018 International Journal of Advanced Computer Science and Applications  
In this paper, an M-MIMO communication system with a large number of BS antennas with zero-forcing beamforming is proposed for the improved spectral efficiency performance of the system.  ...  In massive MIMO (M-MIMO) systems few hundred numbers of antennas are deployed at each base station (BS) to serve a relatively small number of single-antenna terminals with multiuser, providing higher data  ...  The MIMO technology utilizes entire bandwidth in multi-antenna BS spatially multiplex a large number of user workstation is compatible to communicate.  ... 
doi:10.14569/ijacsa.2018.091254 fatcat:q6pzpwzj2bhxfoxfvclwjgpyci

Dual-polarized wireless communications: from propagation models to system performance evaluation

C. Oestges, B. Clerckx, M. Guillaud, M. Debbah
2008 IEEE Transactions on Wireless Communications  
In this paper, we address the potential benefits of dual-polarized arrays in multi-antenna wireless systems.  ...  The model relies on a limited number of physical parameters, such as the channel spatial correlations, the channel co-polar and the cross-polar ratios and the antenna cross-polar discrimination.  ...  , especially at low SNR levels.  ... 
doi:10.1109/t-wc.2008.070540 fatcat:wqsdsw5qv5eifdga3y66caj6hm

Massive MIMO: ten myths and one critical question

Emil Björnson, Erik G. Larsson, Thomas L. Marzetta
2016 IEEE Communications Magazine  
By having at least an order of magnitude more antennas than active terminals, one can exploit asymptotic behaviors that some special kinds of wireless channels have.  ...  Wireless communications is one of the most successful technologies in modern years, given that an exponential growth rate in wireless traffic has been sustained for over a century (known as Cooper's law  ...  Fredrik Tufvesson and his colleagues at Lund University, who provided the picture of their LuMaMi testbed.  ... 
doi:10.1109/mcom.2016.7402270 fatcat:5ykj22vo4fdstp2ttqnbhvktqm

Massive MIMO for Internet of Things (IoT) Connectivity [article]

Alexandru-Sabin Bana, Elisabeth de Carvalho, Beatriz Soret, Taufik Abrão, José Carlos Marinello, Erik G. Larsson, Petar Popovski
2019 arXiv   pre-print
On the one hand, the benefits of applying massive MIMO for broadband communication are well known and there has been a large body of research on designing communication schemes to support high rates.  ...  Exploiting the large number of degrees of freedom (DoFs) of massive MIMO essential for achieving high spectral efficiency, high data rates and extreme spatial multiplexing of densely distributed users.  ...  Coherent and non-coherent UL transmissions are compared in [27] for the case of multi-antenna base-station (BS) and single-or two antennas at the transmitting device.  ... 
arXiv:1905.06205v1 fatcat:xqe2z6evhrc27cvtxad5iiko4a

MIMO Channel Modelling for Satellite Communications [chapter]

Abbas Mohammed, Asad Mehmoo
2010 Satellite Communications  
An alternative solution to achieve low fading correlation is to use antenna arrays with cross polarizations, i.e., antenna arrays with polarizations in orthogonal or near orthogonal orientations without  ...  The antenna separation, in terms of wavelength of the operating frequency, has significant impact on the spatial correlation.  ...  Application of Polarized MIMO Channels to Satellite Communications The large MIMO gains can be achieved with low correlation between antenna elements at both ends of MIMO communication system.  ... 
doi:10.5772/9983 fatcat:wfb6q76kgnditplri3dfpchbpe

Pilot design for multi-user MIMO

Gunther Auer, Ivan Cosovic
2009 2009 IEEE International Conference on Acoustics, Speech and Signal Processing  
Fortunately, spatial correlation at the transmitter has the potential to substantially reduce overheads, by introducing spatial reuse of dedicated pilots, and by utilizing spatial interpolation of common  ...  In this paper, challenges regarding the provision of channel state information (CSI) on a multi-user (MU) MIMO-OFDM downlink are addressed.  ...  The output of the precoder V x n, is passed to an antenna array with N T elements, and transmitted over a multipath fading channel.  ... 
doi:10.1109/icassp.2009.4960410 dblp:conf/icassp/AuerC09 fatcat:m5tiplvvvrczbg7v5puyzki4tq

Performance of ED-based Non-coherent Massive SIMO Systems in Correlated Rayleigh Fading

Huiqiang Xie, Weiyang Xu, Wei Xiang, Bing Li, Rui Wang
2019 IEEE Access  
In recent studies, a simple non-coherent communications' scheme based on energy detection is proposed for massive single-input multiple-output systems, where transmit symbols are decoded by averaging the  ...  INDEX TERMS Non-coherent massive single-input multiple-output (SIMO), correlated Rayleigh fading, symbol-error rate (SER), achievable rate.  ...  information (CSI) at either the transmitter or receiver, In spite of a sub-optimal performance, non-coherent receivers enjoy the benefits of low complexity, low power consumption and simple structures  ... 
doi:10.1109/access.2019.2894719 fatcat:kgiswxwlezgc5a77tgrkc27aei

Performance limits of energy detection systems with massive receiver arrays

Lishuai Jing, Zoran Utkovski, Elisabeth de Carvalho, Petar Popovski
2015 2015 IEEE 6th International Workshop on Computational Advances in Multi-Sensor Adaptive Processing (CAMSAP)  
Energy detection (ED) is an attractive technique for symbol detection at receivers equipped with a large number of antennas, for example in millimeter wave communication systems.  ...  For a fixed constellation size, the impact of the number of antennas and SNR on the achievable information rate is investigated.  ...  First, while ED (implemented by averaging over all antennas) benefits from the "hardening" effects of both channel and noise, it does not fully exploit the multiple receive antennas.  ... 
doi:10.1109/camsap.2015.7383772 dblp:conf/camsap/JingUCP15 fatcat:b3mrlcql7rcdnesqkuqd5o3cr4

On Channel Correlation Based Scheduling and Signalling for MIMO-OFDMA Downlink

Andreas Ibing, Holger Boche, Philipp Otto
2011 2011 IEEE 73rd Vehicular Technology Conference (VTC Spring)  
For flexible scheduling, prediction of the quantized channel at the base-station is needed.  ...  We propose measurement of 3D channel correlation parameters by the terminals and signalling back to the base station, which enables prediction of the quantized channel by multi-dimensional Wiener filtering  ...  In addition, spatial (antenna) correlation can be used to select the number of MIMO streams and/or MIMO mode.  ... 
doi:10.1109/vetecs.2011.5956189 dblp:conf/vtc/IbingBO11 fatcat:o2d4vjo3knhgxlnvspszom2zy4

Performance of hybrid ARQ on dual-branch diversity receiver in Rayleigh fading channel

Ghaida A. AL-Suhail, Rodney A. Kennedy
2010 2010 4th International Conference on Signal Processing and Communication Systems  
Both spatially uncorrelated and correlated antenna branches are investigated for identical and non-identical channels.  ...  In contrary, the channel coding influences significantly on the lower range of operating channel SNR in the selection combining receiver when identical and non-identical correlated antenna branches are  ...  Both spatially uncorrelated and correlated antenna branches are investigated for identical and non-identical channels using HARQ Type I. II.  ... 
doi:10.1109/icspcs.2010.5709741 fatcat:7jthrbepozdcrb25oicitpyncu
« Previous Showing results 1 — 15 out of 1,735 results