Abstract—2×2 unitary precoding based on receiver feedback is applied alongside spatial multiplexing at the base station in HSDPA (D-TxAA) when the mobile terminal supports MIMO transmissios [1]. This precoding will influence achievable sumrate

MPU6050是我们常用的六轴空间位置处理芯片，次文档使用卡尔曼滤波的方式使数据更加的准确(MPU6050 is our commonly used six-axis spatial position processing chip. Kalman filter is used in sub-documents to make the data more accurate.)