Interference management in cooperative multi-cell networks

摘要: In multi-cell networks where resources are aggressively reused, eliminating interference is the key factor to reduce system energy consumption. This thesis proposes management techniques based on beamforming with different levels of cooperation amongst base stations (BSs). First, a (MBF) technique introduced design beamformers as if geographically distributed BSs were single BS. The aim minimise total transmit power across network while maintaining required signal-to-interference-plus-noise ratio (SINR) for every user. An iterative algorithm proposed solve optimisation problem MBF. Since MBF scheme requires circulation all users’ data coordinating BSs, user position aware (UPA) developed backhaul overhead by allocating each nearby only. To completely avoid circulation, semi definite programming (SDP) algorithm, named coordinated (CBF), jointly calculate beamformers coordinating BSs in manner that BS transmits its local users Taking into account errors channel estimations, robust designs CBF. Next, fast wireless protocols, i.e., Star and Ring, using coding enable links coordinating BSs. maximum achievable throughput protocol is analysed. consumption Ring characterised used compare evaluate performance schemes. deployments MBF, UPA-MBF CBF schemes require central unit group well backhaul links them. fact, may not always be available, e.g., femtocell self-organising networks, limited. Hence, (DBF) independently design DBF, combination BS’s resulting toward other BSs’ minimised SINRs maintained. SDP algorithms DBF.