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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,...
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