PROJECT TITLE :
Interference Alignment with Cooperative Primary Receiver in Cognitive Networks
In cognitive radio systems, secondary users may transmit signals by aligning their signal directions to the first user's unused directions. However, their achievable transmission rates are very low in moderate to high SNR regime as a result of the primary user takes most of obtainable degrees of freedom (DoF). So as to extend the secondary transmission rate, we have a tendency to take into account the case that the first receiver performs interference suppression filtering. By counting the quantity of variables and the number of equations in the interference alignment (IA) condition, we analyze the secondary users' achievable DoF, that is more than the standard theme. Simulation results show that the first receiver's participation in IA significantly will increase the secondary rate with negligible primary rate reduction.
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