Wang, Tao
[UCL]
(eng)
This thesis addresses resource allocation (RA) problems in orthogonal frequency division modulation or multiple access (OFDM or OFDMA) systems. It contains three parts.
In the first part, general optimization theory and methods are presented. In particular, the successive convex approximation (SCA) method is generalized to the successive approximation (SA) method to solve a general optimization problem. General methods are proposed to construct a convex upper bound approximation for a nonconvex function, which is the key to the SCA method. The expectation-maximization algorithm and the successive geometric program approximation algorithm are shown to be special cases of the SA method.
In the second part, two RA problems for interference-corrupted OFDM systems are investigated. The first one is the weighted sum rate (WSR) maximized dynamic spectrum management for point-to-point OFDM systems. The second one is to maximize the weighted sum of per cell minimal user rates in a multi-cell OFDM-based downlink system.
In the last part, two RA problems for multiple decode-and-forward (DF) relays aided OFDM(A) systems are studied. The first one is a sum rate maximized RA problem for a point-to-point OFDM system aided by multiple DF relays. The second one is a WSR maximized RA problem for an OFDMA downlink system aided by multiple DF relays.


Bibliographic reference |
Wang, Tao. Resource allocation in OFDM-based wireless communication systems. Prom. : Vandendorpe, Luc |
Permanent URL |
http://hdl.handle.net/2078.1/109516 |