OFDMA框架下一种低代价直接信道信息反馈方法

A Low Cost Direct Channel Feedback Method in OFDMA Systems

该文提出一种低代价下行信道信息实时反馈方法。在接收端将模拟量信道信息扩频后叠加在上行信息序列中进行上传,不必为下行信道信息分配单独的时频资源。在基站侧利用干扰消除原理,迭代进行信息序列检测与信道信息估计。由于对下行信道信息进行了扩频处理,即使分配较低的能量也能在基站侧可靠恢复。仿真实验证明这种方法的有效性。

A low cost, reai-time CSI feedback method is proposed. The analog DownLink Channel State Information （DL-CSI） obtained at receivers is spreaded and then superimposed upon UpLink User Sequences （UL-US） before transmitting, thus avoiding DL-CSI from exclusive occupation of system resources. Using interference cancellation, iterative UL-US detection and DL-CSI estimation is carried out at base station. Due to spreading, DL-CSI can be accurately recovered even with little allocated energy. Simulations results demonstrate the practicability of the proposed method.