On Degrees of Freedom for Multi-user Interweave and Underlay Cognitive Radios
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Abstract
The degrees of freedom (DoF) of full-duplex (FD) multi-user cognitive radios (CR) is studied in this work. Due to the fact that FD adopted multiple cognitive users (CUs) suffer not only self-interference (SI) and primary-user interference (PUI) but also multi-user interference (MUI) from the other CUs, the DoF metric is constrained by various interference factors and shows scale invariance properties with respect to temporal, frequency and spatial dimensions. In this regard, the average DoF is characterized in both spatio and temporal dimensions using limitation calculation (LC) and interference alignment (IA) methods, under interweave and underlay CR patterns. Theoretical analysis indicates that because of distributed CR processing, the average DoF for MU CR is upper-bounded by that of single-user CR. Simulation results validate the effects of MUI, SI, PUI and user number on the average DoF. It shows that IA achieves higher DoF than that of LC for multi-user CR, indicating that the DoF loss due to MUI can be reduced if interference mitigation is available.
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November 2019
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Published: 01 November 2019
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