Impact of mobility and closed-loop power control to received signal statistics in Rayleigh fading channels

Impact of closed-loop power control to received signal statistics is studied. Results in this paper are based on single-user link level simulations with a fixed-step power control. Main interest is on the Rayleigh fading channel correlation, amplitude and phase changes in the system due to the closed-loop power control. Power control dependent changes in the complex channel coefficient correlation are needed, e.g., in the Kalman or Wiener filter based channel estimation. Key adjustable parameters in the simulations are mobile speed, power control step size and power control command error rate. Simulation results indicate that power control can compensate channel variations at low velocities. When the fading is fast enough compared to the power control rate, power control can increase fluctuations in the received signal. Well-working power control reduces channel correlation slightly.