Precoding and power allocation for two-tier heterogeneous networks

Document Type

Article

Publication Date

2-21-2019

Abstract

In two-tier heterogeneous networks, the cross-tier interference and co-tier interference significantly affect the network performance. In this chapter, cascaded precoders in orthogonal frequency-division multiplexing systems are investigated to protect macro-cell user equipments (MUEs) from the cross-tier interference caused by co-located small cells and at the same time to satisfy the quality-of-service (QoS) requirements of small-cell user equipments (SUEs). An outer precoder ensures that the signals intended for the SUEs are orthogonal to the MUEs thus avoids the cross-tier interference from the second tier. Moreover, optimal power allocation through an inner precoder at each small base station (SBS) yields better performance of the SUEs and guarantees their QoS requirements.With consideration of the dense deployment of SBSs, an SBS selection algorithm is studied to further reduce the computational complexity. Simulation results demonstrate that the cascaded precoders are effective in mitigating the interference and enhancing the capacity of small cells.

Publication Source (Journal or Book title)

Handbook of Cognitive Radio

First Page

1343

Last Page

1359

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