Per-user unitary rate control: Difference between revisions

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'''Per-User Unitary Rate Control''' (PU²RC) is a multi-user MIMO scheme. PU2RC utilizesuses both transmission pre-coding and multi-user scheduling. By doing that, the network capacity is further enhanced than the capacity of the single-user MIMO scheme.

* Background technologies: A single-user MIMO was initially developed to improve the spectral efficiency of point-to-point wireless transmission link. A multi-user MIMO was developed for cellular systems where the base station simultaneously communicates with multiple users.

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The operation of PU²RC is mathematically described for the transmitter and receiver sides, respectively.

===Base Stationstation===

It is assumed that the base station employs <math>N_t</math> transmission antennas. The <math>N_t \times 1</math> transmission signal vector is given by

:<math>\mathbf{x} = \sum_{i=1}^K \mathbf{w}_i P_i s_i</math>

where <math>\mathbf{w}_i</math> is the <math>N_t \times 1</math> linear precoding vector. PU²RC generates <math>\mathbf{w}_i</math> based on the received finite channel status information, which is delivered to the base station from the user equipment (UE) through uplink feedback signaling. The feedback signal consists of index in a look-up table of a precoding codebook.

===Receiver Sideside===

Every receiver has a receive antenna array with <math>N_r</math> elements. The receive signal vector at user <math>k (=1,2,\ldots,K)</math> is modeled as follows:

:<math>\mathbf{y}_k = \mathbf{H}_k\mathbf{x}+\mathbf{n}_k</math>

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The figure illustrates the throughput advantage of PU²RC over the conventional single-user and no scheduling scheme, assuming that the codebook size is one, i.e., <math>(G=1)</math>. For larger codebook sizes the performance can be better than the performance of the unit-size codebook. Because of codebook-based multi-user scheduling, PU²RC outperforms the conventional single-user and no scheduling scheme when the number of users is larger than one. Note that the performance plotted in the figure for the two systems were obtained assuming linear receiver.

==PU²RC Sourcesource and Backgroundbackground Materialsmaterials==

=== Source Materialsmaterials ===

* James S. Kim, K. B. Lee, et al., Mobile communication apparatus and method including base station and mobile station having multi-antenna, US PTO 7,324,480

* [http://mobile.snu.ac.kr/mcl_list/papers/journal/IEICEtcomm_200608_sjkim_hjkim_cspark_kblee.pdf S. J. Kim, H. J. Kim, C. S. Park, and K. B. Lee, "On the Performance of Multiuser MIMO Systems in WCDMA/HSDPA: Beamforming, Feedback and User Diversity," IEICE Transactions on Communications, vol. E98-B, no. 8, pp. 2161–2169, Aug. 2006.]

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* Samsung, SNU, [http://www.3gpp.org/ftp/tsg_ran/WG1_RL1/TSGR1_44/Docs/R1-060335.zip "Downlink MIMO for EUTRA," in 3GPP TSG RAN WG1 # 44/R1-060335]

=== Enhanced Methodsmethods ===

* [http://mobile.snu.ac.kr/mcl_list/papers/conference/ew200504_sjkim_hjkim_kblee.pdf Multiuser MIMO Scheme for Enhanced 3GPP HSDPA]

* Kim, J.S., Hojin Kim, Yongxing Zhou, Jianjun Li, ``Multi-Mode Multi-User MIMO System with Finite Rate Feedback'', IEEE Wireless Communication Systems, 2006. ISWCS '06. 3rd International Symposium on, 6-8 Sept. 2006''

===Background Referencesreferences===

* R. W. Heath, Jr., M. Airy, and A. J. Paulraj, "Multiuser Diversity for MIMO Wireless Systems with Linear Receivers," Proc. of the IEEE Asilomar Conf. on Signals, Systems, and Computers, pp.&nbsp;1194 –1199, vol.2, Pacific Grove, California, Nov. 4 - 7, 2001.

* A. Kogiantis and L. Ozarow, "Downlink best-effort packet data with multiple antennas," ICC’03, Volume 1, 11–15 May 2003 Page(s):715 - 719.

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* Further benefits of the revised definition of CQI for TxAA, 3GPP TSG-R1-030130, San Diego, Jan. 7-10, 2003.

==PU²RC Citationscitations==

=== Books ===

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[6] [http://books.google.com/books?id=Zo5R1MBp1P4C&pg=PA304&lpg=PA304&dq=User+Grouping+Method+for+PU2RC+Downlink&source=bl&ots=-tHdXU46FX&sig=TWPdoN0RqCR-xCsCiBBIgo5bd-g&hl=ko&ei=G0i8TPDTFZCisAP90NiTDw&sa=X&oi=book_result&ct=result&resnum=4&ved=0CCQQ6AEwAw#v=onepage&q&f=false Broadband wireless access and local networks: mobile WiMax and WiFi (공)저: Byeong Gi Lee,Sunghyun Choi]

===Journal and Conferenceconference Paperspapers===

[1] Jianhong Zheng, Zongzhi Huang, Jianrong Wei, ""A Novel Multi-User MIMO Scheme in OFDM Systems," Circuits, Communications and Systems, Pacific-Asia Conference on, pp.&nbsp;43–46, 2009 Pacific-Asia Conference on Circuits, Communications and Systems, 2009.

:* Page 4, [6] Samsung, SNU, "Downlink MIMO for EUTRA," in 3GPP TSG-RAN WG1, 44 R1-060335, February 2006.

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[18] [http://portal.acm.org/citation.cfm?id=1803141 Caihua Zhang, Wei Xu, Ming Chen, Multi-mode transmission for MIMO broadcast channels with PU2RC, Proceedings of the 15th Asia-Pacific conference on Communications, 277-280, 2009]

===Slide and Documentationsdocumentations===

# [http://userver.ftw.at/~cfm/389039/lecture13/HSDPA_Lecture_2004-01-15.pdf Forschungszentrum Telekommunikation, Wien LVA 389.089, Lecture January 15, 2004., High Speed Downlink Packet Access (HSDPA)]

# http://ettrends.etri.re.kr/PDFData/21-3_048_058.pdf

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# [http://ieee802.org/16////tgm/contrib/C80216m-08_406.doc MU-MIMO Comparison(C80216m-08_406.doc), May 3, 2008,Intel]

== MU-MIMO Standardstandard Contributionscontributions ==

The following documents are standard contributions about both PU2RC related and general MU-MIMO issues.

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==See also==

===Codebook and Signalsignal Processingprocessing===

* Quantized Principal Component Selection Precoding for Limited Feedback Spatial Multiplexing, 2006 ICC

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* Multimode basis selection for spatial multiplexing with limited feedback, 2005 Electronics Letters

=== WikipediaSee Articlesalso ===

* [[Multiple-input multiple-output communications]]

* [[Multi-user MIMO]] as the advanced MIMO communication technology

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* [http://www.ll.mit.edu/asap/asap_04/DAY1/14_PR_POOR.PDF V. Poor, Multiuser MIMO Systems]

==MIMO Literatureliterature==

#[http://www.ieee.li/pdf/viewgraphs/wireless_mimo.pdf Dr. Jacob Sharony, "Introduction to Wireless MIMO – Theory and Applications", IEEE LI, November 15, 2006]

#[http://www.ll.mit.edu/publications/journal/pdf/vol15_no1/15_1mimo.pdf Daniel W. Bliss, Keith W. Forsythe, and Amanda M. Chan, MIMO Wireless Communication, VOLUME 15, NUMBER 1, 2005 LINCOLN LABORATORY JOURNAL]