RA with CA for a Cellular System Sharing Spectrum with S-Band Radar

In this chapter, we consider an LTE-Advanced cellular system sharing the 3550-3650MHz band with aMIMO radar [13]. The LTE-Advanced cellular system has NBS base stations. In order to mitigate radar interference, a spectrum sharing algorithm is proposed. The algorithm selects the best interference channel for radar’s signal projection to mitigate radar interference to the ith BS. We consider a MIMO collocated radar mounted on a ship. Collocated radars have improved spatial resolution over widely spaced radars [14]. The LTE cellular system operates in its regular licensed band and shares the 3:5 GHz band with a MIMO radar in order to increase its capacity such that the two systems do not cause interference to each other. We focus on finding an optimal solution for the resource allocation with carrier aggregation problem to allocate the LTE-Advanced BS/eNodeB and the available MIMO radar resources optimally among users subscribing for a service in the cellular cell coverage area. Each user is assigned a utility function based on the application running on its UE. Real-time applications are represented by sigmoidal-like utility functions whereas delay-tolerant applications are represented by logarithmic utility functions. Real-time applications are given the priority when allocating resources. A resource allocation with carrier aggregation algorithm is proposed in this chapter to allocate the LTE-Advanced eNodeB and the MIMO radar resources optimally among users. The proposed algorithm is performed in two stages, the LTE-Advanced eNodeB resources are first allocated to users subscribing for a service and then the available MIMO radar resources are allocated to the same users. The algorithm employs a proportional fairness approach in its two stages to guarantee that no user is allocated zero resources and gets dropped.

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