Analysis of adjacent channel interference in heterogeneous cellular networks

In this paper, in heterogeneous cellular networks (HCN), we first consider an approximation model for the aggregate adjacent channel interference (ACI) from nearby small-cells at a user in a macro-cell. With the help of two well known approximations for ACI, the signal to interference ratio (SIR) of users in a macro-cells (victim users) is derived in the presence of coexisting small-cells. In addition, the outage probabilities of the victim user in HCN is also derived to measure the performance of the system. Through simulations, we can demonstrate that as the small-cell intensity increases, the outage probability of victim user increases. Furthermore, under the same small-cell intensity, it is shown that as the distance between the user and its macro-cell base station (BS) increases, the outage probability also increases.