CAJ | 학술논문

为优化多输入多输出双向中继系统的功率分配，应用广义奇异值分解方法对角化一对用户到中继的信道，并划分成两种传输模式：单向和双向中继传输模式。针对划分后的空间子信道采取矩阵置换的方法对齐中继节点处的链路信号。此外，相比传统的每个节点总功率约束，提出约束单链路下3节点总功率的方法来最大化系统平均总速率，获得功率优化的封闭解并降低计算的复杂度。仿真结果显示，所提功率算法具有和全局优化算法非常相近的性能，且在30 dB处，天线规格从3‐5‐3到4‐6‐4再到5‐7‐5，能够带来近2 bit／（s · Hz－1）的递增增益。
위우화다수입다수출쌍향중계계통적공솔분배，응용엄의기이치분해방법대각화일대용호도중계적신도，병화분성량충전수모식：단향화쌍향중계전수모식。침대화분후적공간자신도채취구진치환적방법대제중계절점처적련로신호。차외，상비전통적매개절점총공솔약속，제출약속단련로하3절점총공솔적방법래최대화계통평균총속솔，획득공솔우화적봉폐해병강저계산적복잡도。방진결과현시，소제공솔산법구유화전국우화산법비상상근적성능，차재30 dB처，천선규격종3‐5‐3도4‐6‐4재도5‐7‐5，능구대래근2 bit／（s · Hz－1）적체증증익。
In order to optimize the power allocation of the MIMO two‐way relay system , we diagonalize the channels between users and relay using the generalized singular value decomposition( GSVD) method , and divide them into two transmission models: one‐way relay model and two‐way relay model . For the subchannels , a scheme of permutation is proposed to align the data streams at the relay node . Moreover , we propose the method for the power constraint of three nodes under each data stream to maximize the average sum‐rate of the system instead of the constraint of each node's total power and get the close‐form optimal solution which can reduce the complexity of the algorithm . Finally , simulation results demonstrate that the performance of the scheme we use is very close to that by the global optimization algorithm , and that with the antennas specification from 3‐5‐3 to 4‐6‐4 and to 5‐7‐5 , the scheme can bring about approximate 2 bit/( s.Hz-1 ) increased gain when the SNR is 30 dB .