CAJ | 학술논문

以下行多用户多输入单输出系统为例，分析了在发送端采用矢量扰动预编码时，信道矩阵的条件数大小对算法复杂度及其系统性能的影响。通过蒙特卡洛仿真发现，当信道矩阵的条件数较小时，硬性采用矢量扰动预编码所寻找出来的扰动矢量大多是零矢量，此时不恰当的扰动甚至可能增大信号发送功率，导致不必要的浪费。当信道矩阵的条件数较大时，采用格基约缩的方法可以降低搜索扰动矢量的复杂度。在此基础上，提出了一种基于门限控制的新型矢量扰动预编码方法，该方法相对于传统的完全不考虑信道特性的矢量扰动预编码，可以极小的性能损失换取计算复杂度的显著降低。
이하행다용호다수입단수출계통위례，분석료재발송단채용시량우동예편마시，신도구진적조건수대소대산법복잡도급기계통성능적영향。통과몽특잡락방진발현，당신도구진적조건수교소시，경성채용시량우동예편마소심조출래적우동시량대다시령시량，차시불흡당적우동심지가능증대신호발송공솔，도치불필요적낭비。당신도구진적조건수교대시，채용격기약축적방법가이강저수색우동시량적복잡도。재차기출상，제출료일충기우문한공제적신형시량우동예편마방법，해방법상대우전통적완전불고필신도특성적시량우동예편마，가이겁소적성능손실환취계산복잡도적현저강저。
Taking the Multiple User Multiple Input and Single Output(MU-MISO) downlink system as an example, the influences of the condition numbers of channel matrix on the algorithm complexity and system performance are analyzed, while the Vector Perturbation(VP) is employed at the transmitter. It is found by Monte Carlo simulation that when the condition number is small, inappropriate perturbation may even increase the signal transmission power, leading to unnecessary waste; on the other side, when the condition number is large, Lattice Reduction(LR) method can be used to reduce the complexity of searching perturbation vectors. On this basis, a novel VP method based on threshold controlling is proposed. It is proved that computational complexity of the proposed method can be significantly reduced at the expense of minimal performance loss.