为提升通信质量,针对智能反射面(Intelligent Reflecting Surface,IRS)辅助的空时线编码(Space-Time Line Code,STLC)系统,提出基于IRS相位设计的STLC系统误码率性能优化策略.建立关于IRS相位矢量的优化用户端信噪比目标问题,利用半定规划(Semidefinite Relaxation,SDR)法和单模约束松弛法(Unit-modulus Constraint Relaxation,UCR)求解,得到提升用户端信噪比的 IRS相位的解,进而降低系统误码率.仿真结果表明,与没有采用 IRS辅助的STLC系统相比,IRS辅助的STLC系统可显著降低误码率.
Performance Optimization of Space-Time Line Code System Based on IRS Phase Shift Design
In order to improve quality of communication,performance optimization scheme based on phase shift design of Intelligent Reflector Surface(IRS)is proposed for IRS assisted Space-Time Line Code(STLC)system.Firstly,signal noise ratio of user optimiza-tion problem with phase shift vector of IRS is established.Then,both Semidefinite Relaxation(SDR)method and Unit-modulus Con-straint Relaxation(UCR)method are used to solve the problem.And the solution of IRS phase shift which improves the user's SNR is obtained.Finally the system bit error rate is reduced.Simulation results show that compared with the STLC system without IRS,the IRS-assisted STLC can significantly reduce the bit error rate.
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