Candidate: Shayan Mohajer Hamidi
Title: Broadcasting Enhancement in Cellular Systems
Date: February 26, 2018
Time: 10:00am
Place: EIT 3142
Supervisor(s): Khandani, Amir K.
Abstract:
Due to the fast-growing number of cell-phone users, various channel allocation strategies play an important role in cellular systems. Having known that for downlink transmission the base-station aims to transmit signal over a specific channel to different users, broadcasting enhancement gains momentum in cellular systems. Assume a scenario in which base-station is equipped with M time/frequency recourses and M clients are being served with their own rate requirement. Optimum solution in a degraded broadcast channel is to send signal to all users over all channels. However, this enlarges the code-book which leads to intricate coding/decoding systems. Taking this into account, the idea of grouping the clients into smaller subsets has been proposed in this research. The required rate for each client should be satisfied in each subset which has determined size, inter alia, two or three.
That the highest gain is obtained by broadcasting scenario in each subset leads us to just focus on how to group the clients such that it would give us the highest gain. Optimum solution can be achieved using linear programming. However, it turns out linear programming satisfies zero-one constraint which can be efficiently solved by Hungarian method. It has been shown that this practical method conspicuously outperforms the traditional frequency division.