Link Level Modeling For High Speed Wireless Communication System Simulations

The interface between link and system level simulations is important for accurate evaluation of wireless communication systems. Two popular methods, modified actual value interface (AVI) and quasi-static method (QSM) cannot accurately model the E_s/N_t variation brought by fading channel and link adaptation. E_s/N _t variation brings link performance loss and it is important to model its effect to system performance. A new method is proposed to characterize E_s/N_t variation with standard deviation of equivalent E_s/N_t in this paper. Subslot is also used as the minimal unit of E_s/N_t calculation to achieve more accurate modeling for high velocity. Link level results show the importance of modeling E_s/N_t variation, for example, link performance loss can be as high as 2.5 dB when standard deviation of equivalent per-subslot E_s/N_t is 5 dB. Furthermore, Simulation results verify that the proposed method can accurately model E_s /N_t variation for system level simulations