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Since the CSI at the BS is always imperfect due to the channel estimation error and delay, the imperfectness of the CSI needs to be considered in practical system design. It causes interuser interference at the zero-forcing (ZF) receiver and makes it difficult to obtain the globally optimal power allocation that maximizes the energy efficiency (EE). Hence, we propose a non-cooperative energy-efficient uplink power control game, where each user selfishly updates its own uplink power. The proposed uplink power control game is shown to admit a unique Nash equilibrium. Furthermore, to improve the efficiency of the Nash equilibrium, we study a new game that utilizes a pricing mechanism. For the new game, the existence of a Nash equilibrium and the convergence of the best response dynamics are studied based on super-modularity theory. Simulation results show that the proposed schemes can significantly improve the EEs of the mobile users in uplink multiuser SIMO systems.<\/jats:p>","DOI":"10.1186\/1687-1499-2014-166","type":"journal-article","created":{"date-parts":[[2014,10,12]],"date-time":"2014-10-12T01:00:55Z","timestamp":1413075655000},"update-policy":"http:\/\/dx.doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Energy-efficient uplink power control for multiuser SIMO systems with imperfect channel state information"],"prefix":"10.1186","volume":"2014","author":[{"given":"Moonheok","family":"Jang","sequence":"first","affiliation":[]},{"given":"Younggap","family":"Kwon","sequence":"additional","affiliation":[]},{"given":"Hyunsung","family":"Park","sequence":"additional","affiliation":[]},{"given":"Taewon","family":"Hwang","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2014,10,12]]},"reference":[{"issue":"2","key":"985_CR1","doi-asserted-by":"publisher","first-page":"198","DOI":"10.1109\/JPROC.2003.821915","volume":"92","author":"AJ Paulraj","year":"2002","unstructured":"Paulraj AJ, Gore DA, Nabar RU, Bolcskel H: An overview of MIMO communications - a key to gigabit wireless. 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