The performance of the joint transmission in a coordinated multi-point system is bottlenecked by the downlink channel state information errors.To avoid the performance degradation of the joint transmission

a nonlinear robust precoding algorithm is proposed

which utilizes the statistical characteristics of the downlink channel state information errors.Due to the feature of the coordinated multi-point system and the structure of the nonlinear robust precoding algorithm

performance differences exist among user equipments.To improve the bit error rate of the worst performance user and reduce the average bit error rate of the nonlinear robust precoding algorithm

the order of the successive interference cancellation of the nonlinear robust precoding algorithm is also optimized.Simulation results show that the nonlinear robust precoding algorithm proposed in this paper can achieve better performance than the traditional linear and nonlinear precoding algorithms when the downlink channel state information errors exist.Simulation results also show that the ordering optimization can help the nonlinear robust precoding algorithm to attain better performance advantage.