Design and measurement-based evaluations of coherent JT CoMP: a study of precoding, user grouping and resource allocation using predicted CSI

Coordinated multipoint (CoMP) transmission provides high theoretic gains in spectral efficiency with coherent joint transmission (JT) to multiple users. However, this requires accurate channel state information at the transmitter (CSIT) and also user groups with spatially compatible users. The aim o...

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Vydáno v:	EURASIP journal on wireless communications and networking Ročník 2014; číslo 1; s. 1 - 20
Hlavní autoři:	Apelfröjd, Rikke, Sternad, Mikael
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Cham Springer International Publishing 18.06.2014
Témata:	channel predictions Channels Coherence Communications Engineering Coordinated Multipoint Delay Design engineering Electrical Engineering with specialization in Signal Processing Elektroteknik med inriktning mot signalbehandling Engineering Gain Information Systems Applications (incl.Internet) Interference Networks Resource allocation robust precoding Searching Signal,Image and Speech Processing user grouping Coordinated multipoint User grouping Channel predictions Robust precoding Resource allocation
ISSN:	1687-1499, 1687-1472, 1687-1499
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Abstract	Coordinated multipoint (CoMP) transmission provides high theoretic gains in spectral efficiency with coherent joint transmission (JT) to multiple users. However, this requires accurate channel state information at the transmitter (CSIT) and also user groups with spatially compatible users. The aim of this paper is to use measured channels to investigate if significant CoMP gains can still be obtained with channel estimation errors. This turns out to be the case, but requires the combination of several techniques. We here focus on coherent downlink JT CoMP to multiple users within a cluster of cooperating base stations. The use of Kalman predictors is investigated to estimate the complex channel gains at the moment of transmission. It is shown that this can provide sufficient CSIT quality for JT CoMP even for long (>20 ms) system delays at 2.66 GHz at pedestrian velocities or, for lower delays, at 500 MHz, at vehicular velocities. A user grouping and resource allocation scheme that provides appropriate groups for CoMP is also suggested. It provides performance close to that obtained by exhaustive search at very low complexity, low feedback cost and very low backhaul cost. Finally, a robust linear precoder that takes channel uncertainties into account when designing the precoding matrix is considered. We show that, in challenging scenarios, this provides large gains compared with zero-forcing precoding. Evaluations of these design elements are based on measured channels with realistic noise and intercluster interference assumptions. These show that high JT CoMP gains can be expected, on average over large sets of user positions, when the above techniques are combined - especially in severely intracluster interference limited scenarios.
AbstractList	Coordinated multipoint (CoMP) transmission provides high theoretic gains in spectral efficiency with coherent joint transmission (JT) to multiple users. However, this requires accurate channel state information at the transmitter (CSIT) and also user groups with spatially compatible users. The aim of this paper is to use measured channels to investigate if significant CoMP gains can still be obtained with channel estimation errors. This turns out to be the case, but requires the combination of several techniques. We here focus on coherent downlink JT CoMP to multiple users within a cluster of cooperating base stations. The use of Kalman predictors is investigated to estimate the complex channel gains at the moment of transmission. It is shown that this can provide sufficient CSIT quality for JT CoMP even for long (>20 ms) system delays at 2.66 GHz at pedestrian velocities or, for lower delays, at 500 MHz, at vehicular velocities. A user grouping and resource allocation scheme that provides appropriate groups for CoMP is also suggested. It provides performance close to that obtained by exhaustive search at very low complexity, low feedback cost and very low backhaul cost. Finally, a robust linear precoder that takes channel uncertainties into account when designing the precoding matrix is considered. We show that, in challenging scenarios, this provides large gains compared with zero-forcing precoding. Evaluations of these design elements are based on measured channels with realistic noise and intercluster interference assumptions. These show that high JT CoMP gains can be expected, on average over large sets of user positions, when the above techniques are combined - especially in severely intracluster interference limited scenarios. Coordinated multipoint (CoMP) transmission provides high theoretic gains in spectral efficiency with coherent joint transmission (JT) to multiple users. However, this requires accurate channel state information at the transmitter (CSIT) and also user groups with spatially compatible users. The aim of this paper is to use measured channels to investigate if significant CoMP gains can still be obtained with channel estimation errors. This turns out to be the case, but requires the combination of several techniques. We here focus on coherent downlink JT CoMP to multiple users within a cluster of cooperating base stations. The use of Kalman predictors is investigated to estimate the complex channel gains at the moment of transmission. It is shown that this can provide sufficient CSIT quality for JT CoMP even for long (> 20 ms) system delays at 2.66 GHz at pedestrian velocities or, for lower delays, at 500 MHz, at vehicular velocities. A user grouping and resource allocation scheme that provides appropriate groups for CoMP is also suggested. It provides performance close to that obtained by exhaustive search at very low complexity, low feedback cost and very low backhaul cost. Finally, a robust linear precoder that takes channel uncertainties into account when designing the precoding matrix is considered. We show that, in challenging scenarios, this provides large gains compared with zero-forcing precoding. Evaluations of these design elements are based on measured channels with realistic noise and intercluster interference assumptions. These show that high JT CoMP gains can be expected, on average over large sets of user positions, when the above techniques are combined - especially in severely intracluster interference limited scenarios.
ArticleNumber	100
Author	Apelfröjd, Rikke Sternad, Mikael
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Cites_doi	10.1007/s12243-008-0028-3 10.1109/TWC.2012.070912.111383 10.1109/TVT.2010.2045139 10.1109/TIT.2013.2253153 10.1109/TSP.2009.2020030 10.1109/MCOM.2012.6353681 10.1109/TSP.2008.919384 10.1109/TSP.2011.2165706 10.1109/TWC.2012.071612.101350 10.1109/TSP.2006.879269 10.1109/MCOM.2012.6146494 10.1109/TSP.2003.821107 10.1109/TWC.2009.080180 10.1109/TVT.2010.2089707 10.1109/9.376052 10.1109/TIT.2002.1003822 10.1109/TVT.2009.2014384 10.1002/ett.2567 10.1109/TSP.2008.924638 10.1109/TAP.2014.2300531 10.1109/MWC.2006.1678166 10.1109/JSAC.2010.101202 10.1109/JSAC.2008.080817 10.1109/JSAC.2007.070920 10.1109/WSA.2004.1407659
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Copyright	Apelfröjd and Sternad; licensee Springer. 2014. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited.
Copyright_xml	– notice: Apelfröjd and Sternad; licensee Springer. 2014. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited.
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Snippet	Coordinated multipoint (CoMP) transmission provides high theoretic gains in spectral efficiency with coherent joint transmission (JT) to multiple users....
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SubjectTerms	channel predictions Channels Coherence Communications Engineering Coordinated Multipoint Delay Design engineering Electrical Engineering with specialization in Signal Processing Elektroteknik med inriktning mot signalbehandling Engineering Gain Information Systems Applications (incl.Internet) Interference Networks Resource allocation robust precoding Searching Signal,Image and Speech Processing user grouping
Title	Design and measurement-based evaluations of coherent JT CoMP: a study of precoding, user grouping and resource allocation using predicted CSI
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