CAJ | 학술논문

针对多用户特征模式传输( MET)算法这种典型的多用户多入多出( MIMO)算法,现实系统中实现时有两个重要限制：其一要求发射端的和功率约束；其二假定噪声、邻区干扰功率项在基站侧已知且将其建模为加性高斯白噪声( AWGN)。在现实系统中,一方面最好遵循每天线发射最大功率的限制,另一方面需要考虑对噪声、邻区干扰功率项的建模,以期望在基站侧更好模拟用户设备( UE)端最终真实感受到的噪声与干扰功率。基于此,提出了一种鲁棒的针对LTE-A的下行多用户MIMO技术,即自适应的切换波束赋形权值归一化算法。同时,基于该归一化的波束赋形权值,提出一种UE级的信干噪比( SINR)补偿机制。使用该补偿的UE级的SINRs,一方面可基于如容量最大等准则,挑选获得给定调度资源上的最优多用户配对集；另一方面,针对该最终配对的多用户集,使用每UE的补偿SINRs做链路自适应,即MCS选择,从而期望获得系统整体和吞吐量的提升。最后,给定仿真参数,链路级仿真结果验证了所设计算法的有效性。
침대다용호특정모식전수( MET)산법저충전형적다용호다입다출( MIMO)산법,현실계통중실현시유량개중요한제：기일요구발사단적화공솔약속；기이가정조성、린구간우공솔항재기참측이지차장기건모위가성고사백조성( AWGN)。재현실계통중,일방면최호준순매천선발사최대공솔적한제,령일방면수요고필대조성、린구간우공솔항적건모,이기망재기참측경호모의용호설비( UE)단최종진실감수도적조성여간우공솔。기우차,제출료일충로봉적침대LTE-A적하행다용호MIMO기술,즉자괄응적절환파속부형권치귀일화산법。동시,기우해귀일화적파속부형권치,제출일충UE급적신간조비( SINR)보상궤제。사용해보상적UE급적SINRs,일방면가기우여용량최대등준칙,도선획득급정조도자원상적최우다용호배대집；령일방면,침대해최종배대적다용호집,사용매UE적보상SINRs주련로자괄응,즉MCS선택,종이기망획득계통정체화탄토량적제승。최후,급정방진삼수,련로급방진결과험증료소설계산법적유효성。
There are two important actual restrictions for MET( Multi-user Eigen-mode Transmission) algo-rithm implementation, a typical MU-MIMO( Multi-user MIMO) algorithm in LTE-A. One is to keep sum-power restriction over all transmit antennas and the other is noise plus interference power from neighbor cells,i. e. ,σ2 is pre-known and modeled as AWGN(Additive White Gaussian Noise) at eNB. In realistic LTE-A system,itˊd better keep maximum power restriction of per transmit antenna and at the same time,how to model theσ2 at eNB should be considered,thus making it approach near to the real noise plus interference experienced by UE( User Equipment) . To solve these issues,a robust DL MU-MIMO algorithm,i. e. ,adap-tive switching based normalization on final beam-forming weights is proposed. As a result,one UE specific SINR( Signal Interference Noise Ratio) compensation mechanism is constructed. Try to find the optimum MU paired group using those compensated SINRs,at the same time using them to do link adaptation can improve system sum throughput. Simulation results is provided to verify the scheme.