Interference Temperature Model Based Technique for Dead Zone Elimination in Cognitive Radio Overlay Networks
International Journal of Wireless Communications and Network Technologies · 2018
Secondary Spectrum Access based on Interference Temperature is one of the options under Dynamic Spectrum Access which opens up licensed bands for spectrum efficiency.Optimizing this technique holds opportunity for many underutilized licensed bands.Most of the implementation so far deploys the unlicensed user with an independently located cell sites and this approach leads to dead zones or non-uniformities in the cell coverage and capacity.In this work, we investigate an appropriate location of the unlicensed user transmitter that eliminate the dead zones or non-uniformities and together with appropriate technique to reduce the interference level and enhance both coverage and capacity.Estimation of received signal levels at given location from transmitter is performed using the generalized signal propagation model.GSM 900 downlink channels is used for simulation to illustrate the principle.The results show that co-locating the unlicensed transmitter with the primary user is the appropriate location in secondary spectrum access based on interference temperature to eliminate coverage dead zones, and additionally, using spread spectrum reduces the interference and enhances coverage and capacity.