@techreport{TD:100492, att_abstract={{We consider a wireless relay network (WRN) where multiple mobile stations (MSs) try to send their data to a base station (BS) either directly or via a set of fixed relay stations (RSs). For this network, we study the problem of joint optimal MS and RS power allocation and relay selection with the objective of minimizing the total transmitted power of the system. The joint optimization algorithm must satisfy the minimum data demand of each MS. We formulate the problem as a mixed integer nonlinear programming (MINLP) problem and find the solution under different relaying architectures and spatial diversity schemes. The optimal solution of the MINLP problem is exponentially complex due to its combinatorial nature. We use the MATLAB based commercial software TOMLAB to find a near optimal solution of the MINLP problem. We also find an approximate solution of the original problem by applying a simple relay selection scheme based on the channel gains between MSs and RSs. Numerical results are presented to show the performance of this simple scheme with respect to the optimal one in terms of total power consumption.}}, att_authors={md6393, rj2124}, att_categories={C_NSS.18}, att_copyright={{Wireless Innovation Forum European conference on Communications Technologies and Software Defined Ra}}, att_copyright_notice={{The definitive version was published in Mobile VCE Green Radio, Software Defined Radio - Wincomm. {{, 2011-06-23}}{{, http://europe.wirelessinnovation.org/mc/page/MobileVCE }} }}, att_donotupload={}, att_private={false}, att_projects={}, att_tags={relay, cooperative communications}, att_techdoc={true}, att_techdoc_key={TD:100492}, att_url={http://web1.research.att.com:81/techdocs_downloads/TD:100492_DS1_2011-04-22T22:23:30.612Z.pdf}, author={Md Habibul Islam and Zbigniew Dziong and Kazem Sohraby and Mahmoud Daneshmand and Rittwik Jana}, institution={{Mobile VCE Green Radio, Software Defined Radio - Wincomm}}, month={June}, title={{Joint Optimal Power Allocation and Relay Selection with Spatial Diversity in Wireless Relay Networks}}, year=2011, }