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In this paper, we investigate the resource allocation problem for the downlink non-orthogonal multiple access (NOMA) system with imperfect channel state information (CSI). We first derive closed-form expressions for the outage probabilities with and without the estimated instantaneous channel fading coefficient for each user. Upper bounds on both of the probability expressions above are proposed....
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,...
Multiple frequency offsets (CFO) in cooperative communications are difficult, if not impossible, to compensate completely at the destination node. The multiple CFO make the channel time-varying, and thus the conventional space-time codes to collect diversity gain for co-located multi-input multi-output (MIMO) systems may not be applied directly. In a previous paper, we proposed a distributed space-frequency...
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