非理想信道状态信息下的稳健干扰安排设计

为了减小多小区环境下信道误差对传统算法稳健性的影响,通过设立误差约束,并对收发端矩阵进行迭代运算,给出了一种稳健的最小化干扰泄露算法,推导了新的目标约束下具有信道误差的系统和速率表达式.仿真结果表明,该干扰安排算法与未考虑信道误差的算法相比,可以有效地提高小区边缘用户的误码率性能.

A Robust Interference Alignment Scheme with Imperfect CSI Used in Multi-Cell System

In practical communication systems,the prefect channel state information(CSI) is hardly obtained by transmitters owing to imperfect estimate or feedback of the channel coefficients.In order to mitigate the adverse impact of imperfect CSI on bit error rate,based on the constraint of zero-forcing channel error,a robust minimum interference leakage algorithm is proposed for multi-cell multi-user multi-input multi-output system.The formulation of system sum rate is derived under new objective constraint with channel error.Simulations show that if the imperfect CSI is known,the performance on bit error rate and average sum rate of the user in cell edge can be improved by the proposed robust algorithm,especially at the high signal noise rate values.