| 摘要: |
| 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。 |
| 关键词: LTE-A 多用户MIMO 用户特征模式传输 SINR补偿 波束赋形 |
| DOI： |
|
| 基金项目: |
|
| A robust DL MU-MIMO algorithm and UE specific SINR compensation mechanism in LTE-A |
| ZHANG Bijun,ZHAO Songyi |
| () |
| Abstract: |
| There are two important actual restrictions for MET(Multi-user Eigen-mode Transmission) algorithm 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,it′d better keep maximum power restriction of per transmit antenna and at the same time,how to model the σ2 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.,adaptive 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. |
| Key words: LTE-A MU-MIMO multi-user eigen-mode transmission SINR compensation beam-forming |
