单用户对双向中继系统中基于梯度下降的最大化和速率功率分配方案.pdfVIP

第38卷 第2期 电 子 器 件 Vol．38　 No．2 2015年4 月 ChineseJournal of Electron Devices Apr. 2015 A Gradient-Descent-Based Power Allocation of Maximizing Sum-Rate for Single-Pair Two-Way MIMO Relay System∗ 1 1,2,3∗ 1 1 1 1 DAI Yufeng ,SHUFeng ,CHEN Yu ,TONGJuanjuan ,LI Jun ,LUJinhui (1.School of Electronic and Optical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China; 2.NationalMobile Communications Research Laboratory,Southeast University,Nanjing 210096,China; 3.MinisterialKey Laboratory of JGMT,Nanjing University of Science and Technology,Nanjing 210094,China) Abstract:In single-pair two-way relay system,a new power allocation(PA)of maximizing sum-rate based on gradient descent method isproposed. Under the constraint of transmit power sum,with the aimof maximizingthe sum-rate,we obtain thelocally-optimalweightedmatrix of relay station andPApolicy by alternativeiterationbetweentheweighted matrix of relay station and PA policy. The simulations show that,compared to equal PA(EPA),the proposed PA -2 achieves a2.5dB~3dBsignal-to-noise-ratio(SNR)gainatthebit-error-ratio 10 ;additionally,intheregionof medi- um and high SNRs,the proposed PA indicates a sum-rate gain of 0.3 (bit/ s)/ Hz~0.5 (bit/ s)/ Hz over EPA. Key words:MIMO;two-way relay;power allocation;gradient descent method - EEACC:8120　 　 　 　 doi:10.3969/j.issn.1005 9490.2015.02.033 单用户对双向中继系统中基于梯度下降的 最大化和速率功率分配方案∗ 1 1,2,3∗ 1 1 1 1 戴雨峰 ,束　 锋 ,陈　 宇 ,童娟娟 ,李　 隽 ,陆锦辉 (1.