CAJ | 학술논문

信道时间相关多输入多输出(MIMO)系统中一种重要有限反馈策略为差分反馈，该文提出一种适用于单用户多输入单输出(SU-MISO)系统的自适应球帽差分反馈算法。首先，介绍基于信道扰动规律的自适应差分反馈策略；其次，给出一种基于矢量线性运算的差分码本构造方法，它不需要对基码字每个元素进行单独操作，易于计算及生成；最后，运用一阶高斯马尔可夫链信道模型下前一时刻信道方向、选定码字及当前时刻信道方向的随机空间分布规律，给出一种球帽码本半径计算方法。仿真结果说明，该算法能准确跟踪信道并较现有算法有一定性能提高。
신도시간상관다수입다수출(MIMO)계통중일충중요유한반궤책략위차분반궤，해문제출일충괄용우단용호다수입단수출(SU-MISO)계통적자괄응구모차분반궤산법。수선，개소기우신도우동규률적자괄응차분반궤책략；기차，급출일충기우시량선성운산적차분마본구조방법，타불수요대기마자매개원소진행단독조작，역우계산급생성；최후，운용일계고사마이가부련신도모형하전일시각신도방향、선정마자급당전시각신도방향적수궤공간분포규률，급출일충구모마본반경계산방법。방진결과설명，해산법능준학근종신도병교현유산법유일정성능제고。
In the MIMO systems, the differential feedback is an important strategy for temporally correlated channels. A new adaptive spherical-cap differential feedback algorithm is proposed for the Single-User Multiple Input Single Output (SU-MISO) systems. Firstly, this study introduces the adaptive differential feedback strategy from the perspective of the channels disturbance. Secondly, based on vectorslinear operation, one design method of the spherical-cap differential codebook is proposed, which no need to perform operation for each element of based-codewords and is easier to construct. Finally, for the first-order Gauss-Markov Process channel, considering the spatial random distribution among the channel directions at two consecutive time instants and the selected codeword at previous instant, one calculation method of spherical-cap radius is given. The simulation results show that the proposed algorithm can accurately track the channel disturbance and has certain performance improvement than the existing algorithms.