Research On Dynamic Resource Allocation Algorithms For OFDM Systems

It's important that how to manage resources to improve the OFDM systems'performance. The methods of dynamic resource allocation are researched in this paper. First, the development, advantages and disadvantages, basic principle of OFDM are given. Second, the idea and superiority of dynamic resource allocation is introduced. Then much more researches are made on the power and bit allocation algorithms for single-user OFDM systems and a simplifying algorithm is presented. Finally, the dynamic resource allocation in multi-user OFDM systems is discussed greatly. Several sub-optimal algorithms are researched. Then, an improved allocation algorithm which has proportion-equity is introduced. The main results of this thesis are: 1. a simplifying algorithm is presented for power and bit allocation in single-user OFDM systems. Simulations and the problem analysis are done. 2. An improved allocation algorithm possessing proportion- equity is introduced because of the disadvantage of existing algorithm. Simulation has done to prove that our algorithm has the performance close to the multi-user waterfilling algorithm which is a joint allocation algorithm and has the lower computational complexity than it. Our algorithm also can be used in actual systems.