Delay-Constrained Joint Power Control, User Detection and Passive Beamforming in Intelligent Reflecting Surface-Assisted Uplink mmWave System

While millimeter-wave (mmWave) communications can enjoy abundant bandwidth resource, their high susceptibility to blockage poses serious challenges low-latency services. In this paper, a novel intelligent reflecting surface (IRS)-assisted mmWave scheme is proposed overcome the impact of blockage. The minimizes user power multi-user system by jointly optimizing transmit powers devices, detector at base station, and passive beamforming IRS, subject delay requirements. An alternating optimization framework developed decompose joint problem into three subproblems iteratively optimized till convergence. particular, closed-form expressions are devised for update detector. IRS configuration formulated as sum-of-inverse minimization (SIMin) fractional programming solved exploiting direction method multipliers (ADMM). also interpreted latency residual maximization problem, efficiently designing new complex circle manifold (CCMO) method. Numerical results corroborate effectiveness our in terms saving, compared with semidefinite relaxation-based alternative.