This paper analyzes the performance of a hybrid control access scheme for small cells in the context of two-tier cellular networks. The analysis considers MIMO transmit/receive arrays configuration that implements transmit antenna selection (TAS) and maximal ratio combining (MRC) under Rayleigh fading channels when the interfering sources are described using Poisson field processes. The adopted models of aggregate interference at each receive station is modeled as a shot noise that follows a Stable distribution. Furthermore, based on the interference awareness at the receive station, two TAS approaches are considered through the analysis, which are the signal-to-noise (SNR)-based selection and signal-to-interference-plus-noise ratio (SINR)-based selection. In addition, the effect of delayed TAS due to imperfect feedback channel on the performance measures is investigated. New analytical results the hybrid-access scheme's downlink outage probability and error rate are obtained. To gain further insight on the system's behavior at limiting cases, asymptotic results for the outage probability and error rate at high signal-to-noise (SNR) are also obtained, which can be useful to describe diversity orders and coding gains. The derived analytical results are validated via Monte Carlo simulations.


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