Performance Analysis of Downlink Based Multi-Cellular  Systems in Rayleigh Fading

In this paper, we analyzed the performance of the multicell downlink system in the presence of unequal power cochannel interference from the other cells. We adopt the system model composed with two cells and two users, which all equipped with one antenna, While the desired and interfering signals all in the presence of Rayleigh fading channel. First, the closed form expression of system outage probability is derived by using performance analysis method based on probability density function (PDF). Second, by deriving the instantaneous signal to noise plus interference ratio(SINR) and averaging the instantaneous symbol error ratio(SER), average symbol error ratio (ASER) and n order moments of user’s receiving SINR are evaluated. Last, an exact closed-form expression of the Averaging fading (AF) of averaging SINR is derived by using the expression of SINR. Computer simulated the outage probability, ASER and AF performance of the system with the different power of interference cell, while the system composed with two cells and two users. For the performance of outage probability, ASER and AF, Simulation results show that the analytical curves of the derived expressions match well with the numerical simulations. The case study under consideration and the corresponding derived expressions can usefully be employed to investigate the impact of various system and cochannel interference on the performance of multi-cell.