{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,2,21]],"date-time":"2025-02-21T10:11:07Z","timestamp":1740132667437,"version":"3.37.3"},"reference-count":21,"publisher":"Institute of Electrical and Electronics Engineers (IEEE)","issue":"4","license":[{"start":{"date-parts":[[2013,5,1]],"date-time":"2013-05-01T00:00:00Z","timestamp":1367366400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/ieeexplore.ieee.org\/Xplorehelp\/downloads\/license-information\/IEEE.html"}],"funder":[{"DOI":"10.13039\/100000001","name":"National Science Foundation","doi-asserted-by":"publisher","award":["CCF-0964500"],"award-info":[{"award-number":["CCF-0964500"]}],"id":[{"id":"10.13039\/100000001","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2013,5]]},"abstract":"<jats:p>In this paper, a multiple-input-multiple-output (MIMO) system with finite-bit feedback first proposed by Love-Heath is considered, where a transmitted signal consists of a precode followed by an orthogonal space-time block code (OSTBC), such as Alamouti code. A new design criterion and a corresponding design method of precoders are proposed. Simulations show that the precoders obtained by our proposed criterion and method perform better than the existing ones. Furthermore, since our proposed precoders have a layered structure, their designs can be implemented in the simplest Grassmannian manifold. Moreover, a fast encoding algorithm can be applied, which can greatly reduce the complexity of codeword selection. In this paper, we also propose non-unitary precoders and their design criterion and method based on the performance analysis and the special property of an OSTBC. Interestingly, non-unitary precoders can significantly improve performance over unitary precoders.<\/jats:p>","DOI":"10.1109\/tvt.2012.2233508","type":"journal-article","created":{"date-parts":[[2012,12,11]],"date-time":"2012-12-11T14:01:20Z","timestamp":1355234480000},"page":"1646-1654","source":"Crossref","is-referenced-by-count":8,"title":["Unitary and Non-Unitary Precoders for a Limited Feedback Precoded OSTBC System"],"prefix":"10.1109","volume":"62","author":[{"given":"Haiquan","family":"Wang","sequence":"first","affiliation":[]},{"given":"Yabo","family":"Li","sequence":"additional","affiliation":[]},{"given":"Xiang-Gen","family":"Xia","sequence":"additional","affiliation":[]},{"given":"Shunlan","family":"Liu","sequence":"additional","affiliation":[]}],"member":"263","reference":[{"journal-title":"Physical Channels and Modulation Evolved Universal Terrestrial Radio Access (E-UTeA)","year":"2011","key":"ref10"},{"key":"ref11","doi-asserted-by":"publisher","DOI":"10.1109\/MCOM.2010.5458368"},{"key":"ref12","first-page":"678","article-title":"Non-unitary codebook based precoding scheme for multi-user MIMO with limited feedback","author":"fang","year":"2008","journal-title":"Proc IEEE WCNC"},{"key":"ref13","doi-asserted-by":"publisher","DOI":"10.1109\/LCOMM.2009.090480"},{"key":"ref14","doi-asserted-by":"publisher","DOI":"10.1109\/ACSSC.2007.4487257"},{"key":"ref15","doi-asserted-by":"publisher","DOI":"10.1109\/TWC.2009.070623"},{"key":"ref16","doi-asserted-by":"publisher","DOI":"10.1109\/18.868472"},{"key":"ref17","doi-asserted-by":"publisher","DOI":"10.1109\/TIT.2003.817830"},{"key":"ref18","doi-asserted-by":"crossref","first-page":"4340","DOI":"10.1109\/TIT.2005.858943","article-title":"Closed-form designs of complex orthogonal space?time block codes of rates <ref_formula><tex Notation=\"TeX\"> $(k + \\hbox{1})\/(\\hbox{2}k)$<\/tex><\/ref_formula> for <ref_formula><tex Notation=\"TeX\">$\\hbox{2}k - \\hbox{1}$<\/tex><\/ref_formula> or <ref_formula><tex Notation=\"TeX\">$\\hbox{2}k$<\/tex><\/ref_formula> transmit antennas","volume":"51","author":"lu","year":"2005","journal-title":"IEEE Trans Inf Theory"},{"key":"ref19","doi-asserted-by":"publisher","DOI":"10.1109\/TSP.2002.803337"},{"key":"ref4","doi-asserted-by":"publisher","DOI":"10.1109\/LCOMM.2002.1010867"},{"key":"ref3","doi-asserted-by":"publisher","DOI":"10.1109\/18.985950"},{"key":"ref6","doi-asserted-by":"publisher","DOI":"10.1109\/TWC.2004.837469"},{"key":"ref5","doi-asserted-by":"publisher","DOI":"10.1109\/LCOMM.2002.805545"},{"key":"ref8","doi-asserted-by":"publisher","DOI":"10.1109\/TWC.2008.060659"},{"key":"ref7","doi-asserted-by":"publisher","DOI":"10.1109\/TWC.2006.1611051"},{"key":"ref2","doi-asserted-by":"publisher","DOI":"10.1109\/JSAC.2008.081002"},{"key":"ref1","doi-asserted-by":"publisher","DOI":"10.1109\/TSP.2004.838928"},{"key":"ref9","doi-asserted-by":"publisher","DOI":"10.1109\/TCOMM.2009.05.070272"},{"key":"ref20","doi-asserted-by":"publisher","DOI":"10.1049\/el:20030253"},{"key":"ref21","first-page":"2558","article-title":"Performance improvement of transmit beamforming MISO system using optimum codebook indexing over feedback error channel","author":"lee","year":"2008","journal-title":"Proc ISIT"}],"container-title":["Vehicular Technology, IEEE Transactions on"],"original-title":[],"link":[{"URL":"http:\/\/ieeexplore.ieee.org\/iel5\/25\/6514944\/06378483.pdf?arnumber=6378483","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"http:\/\/xplorestaging.ieee.org\/ielx5\/25\/6514944\/06378483.pdf?arnumber=6378483","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2021,11,29]],"date-time":"2021-11-29T15:55:36Z","timestamp":1638201336000},"score":1,"resource":{"primary":{"URL":"http:\/\/ieeexplore.ieee.org\/document\/6378483\/"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2013,5]]},"references-count":21,"journal-issue":{"issue":"4","published-print":{"date-parts":[[2013,5]]}},"URL":"https:\/\/doi.org\/10.1109\/tvt.2012.2233508","relation":{},"ISSN":["0018-9545"],"issn-type":[{"type":"print","value":"0018-9545"}],"subject":[],"published":{"date-parts":[[2013,5]]}}}