CrownCom 2015: Cognitive Radio Oriented Wireless Networks pp 370-380 | Cite as
Symbol Based Precoding in the Downlink of Cognitive MISO Channel
Abstract
This paper proposes symbol level precoding in the downlink of a MISO cognitive system. The new scheme tries to jointly utilize the data and channel information to design a precoding that minimizes the transmit power at a cognitive base station (CBS); without violating the interference temperature constraint imposed by the primary system. In this framework, the data information is handled at symbol level which enables the characterization the intra-user interference among the cognitive users as an additional source of useful energy that should be exploited. A relation between the constructive multiuser transmissions and physical-layer multicast system is established. Extensive simulations are performed to validate the proposed technique and compare it with conventional techniques.
Keywords
Constructive interference Underlay cognitive radio MISO systemPreview
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