{"id":3078,"date":"2016-12-10T02:09:57","date_gmt":"2016-12-10T02:09:57","guid":{"rendered":"http:\/\/network.ee.tsinghua.edu.cn\/niulab\/?p=3078"},"modified":"2017-02-14T08:07:58","modified_gmt":"2017-02-14T08:07:58","slug":"3078","status":"publish","type":"post","link":"https:\/\/network.ee.tsinghua.edu.cn\/niulab\/?p=3078","title":{"rendered":"Networked MIMO with fractional joint transmission in energy harvesting systems"},"content":{"rendered":"<p><span class=\"paper_subtitle\">LANGUAGE<\/span> English <span class=\"paper_subtitle\">SOURCE<\/span><\/p>\n<p><strong><em>IEEE Trans. Commun.<\/em><\/strong>, 2016, 64(8):3323-3336.<\/p>\n<p><span class=\"paper_subtitle\">Published <\/span> <span class=\"paper_subtitle\">Date<\/span>:2016<\/p>\n<p><span class=\"paper_subtitle\">ABSTRACT<\/span> This paper considers two base stations (BSs)<br \/>\npowered by renewable energy serving two users cooperatively.<br \/>\nWith different BS energy arrival rates, a fractional joint transmission<br \/>\n(JT) strategy is proposed, which divides each transmission<br \/>\nframe into two subframes. In the first subframe, one BS<br \/>\nkeeps silent to store energy, while the other transmits data, and<br \/>\nthen, they perform zero-forcing JT (ZF-JT) in the second subframe.<br \/>\nWe consider the average sum-rate maximization problem<br \/>\nby optimizing the energy allocation and the time fraction of<br \/>\nZF-JT separately. First, the sum-rate maximization for given<br \/>\nenergy budgets in each frame is analyzed. We prove that the<br \/>\noptimal transmit power can be derived in closed form, and the<br \/>\noptimal time fraction can be found via bi-section search. Second,<br \/>\nan approximate dynamic programming algorithm is introduced<br \/>\nto determine the energy allocation among frames. We adopt a<br \/>\nlinear approximation with the features associated with system<br \/>\nstates and determine the weights of features by simulation. We<br \/>\nalso operate the approximation several times with random initial<br \/>\npolicy, named policy exploration, to broaden the policy search<br \/>\nrange. Numerical results show that the proposed fractional JT<br \/>\ngreatly improves the performance. In addition, appropriate policy<br \/>\nexploration is shown to perform close to the optimal.<\/p>\n","protected":false},"excerpt":{"rendered":"<p><a href=\"https:\/\/network.ee.tsinghua.edu.cn\/niulab\/wp-content\/uploads\/2017\/02\/\u9f9a\u6770-TC.pdf\"target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-117\" title=\"pdf\" src=\"https:\/\/network.ee.tsinghua.edu.cn\/niulab\/wp-content\/uploads\/2010\/08\/pdf.gif\"alt=\"\" width=\"95\" height=\"50\" \/><\/a>J. Gong, Sheng Zhou, and Z. Zhou, <span class=\"papertitle\">Networked MIMO with fractional joint transmission in energy harvesting systems\uff0c<\/span><span class=\"papersource\">IEEE Trans. Commun.,  64(8):3323-3336.2016,<\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[7],"tags":[100],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/network.ee.tsinghua.edu.cn\/niulab\/index.php?rest_route=\/wp\/v2\/posts\/3078"}],"collection":[{"href":"https:\/\/network.ee.tsinghua.edu.cn\/niulab\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/network.ee.tsinghua.edu.cn\/niulab\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/network.ee.tsinghua.edu.cn\/niulab\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/network.ee.tsinghua.edu.cn\/niulab\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3078"}],"version-history":[{"count":5,"href":"https:\/\/network.ee.tsinghua.edu.cn\/niulab\/index.php?rest_route=\/wp\/v2\/posts\/3078\/revisions"}],"predecessor-version":[{"id":3122,"href":"https:\/\/network.ee.tsinghua.edu.cn\/niulab\/index.php?rest_route=\/wp\/v2\/posts\/3078\/revisions\/3122"}],"wp:attachment":[{"href":"https:\/\/network.ee.tsinghua.edu.cn\/niulab\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3078"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/network.ee.tsinghua.edu.cn\/niulab\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3078"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/network.ee.tsinghua.edu.cn\/niulab\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3078"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}