Cross layer scheduling algorithm with advanced multi antenna support for 4G LTE systems

Long-Term Evolution (LTE) is the next step forward in cellular 3G services. The recent increase of mobile data usage and emergence of new applications such as mobile TV, Web 2.0, streaming contents have motivated the 3rd Generation Partnership Project (3GPP) to work on LTE. The UMTS Long Term Evolution (LTE) is one of the promising solutions for the next generation broadband wireless access systems. In order to support high data rate with low latency, LTE simplifies network architecture and uses orthogonal frequency division multiple access (OFDMA) for downlink transmission technology. LTE system performance largely depends on the high efficiency of MAC packet scheduler. This thesis has the purpose to develop a cross-layer technique that operates in frequency, time and spatial domain, exploiting the advantages of multi-user diversity and multi-antenna transmission modes supported by the LTE 3GPP standard. The implemented algorithm has been firstly developed for the single antenna scheme and lately adapted, with a geometric reshaping of the input parameter matrix, to all the other transmission modes. In this way, the scheduling procedure does apply as it is always in a single antenna scheme allowing the utilization of standard one-antenna algorithms. A complete LTE system level simulator has been developed in order to test the performance of the proposed solution, and an exhaustive number of simulations have been obtained with different propagation scenarios, speed of the users, distance from the base station.