A Study Of Resource Allocation Algorithm In Efficient OFDM System

With the gradual emergence of high-speed wireless services, on one hand, at present the wireless communication systems are still short of capacity. These systems have a poor anti-interference ability and large delay. Thus, improving the spectral efficiency of the wireless communication system is still a hard problem. On the other hand, driven by the high rates, the energy consumption is gradually increasing. Therefore, it’s urgent to promote energy conservation in wireless communication. This paper focuses on the problems above, firstly introduce the principle of high spectral-efficiency OFDM systems, then study OFDM systems aiming at high energy-efficiency, and finally finish design of ultra-high-speed WLAN and implementation of its transmitter.First of all, we introduce the history of high spectral efficient OFDM system resource allocation. Initially, the study focused on single-user OFDM system, then transited to multi-user system. The main contents concentrated in two directions, rate maximization and power minimization. The research of high spectral efficiency OFDM system resource allocation is the theoretical basis of this article.Then, for the energy efficient OFDMA system, this paper completed three processes, including model building, research idea analysis and algorithm simulation. First, we define the concept of energy efficiency, establish the resource allocation model, and calculate all the variables in the function. Second, we analyze the current status of energy efficiency research, and summed up all these methods in two different categories. Thirdly, we present two resource allocation algorithms, namely the Rate-Difference Based Subcarrier Assignment Algorithm (RBSA) and the Rate-Difference Based Power Allocation Algorithm (RBPA). The simulation results show the significant improvement of energy-efficiency with the proposed schemes and demonstrate the effectiveness of the proposed algorithms.Finally, we describe the design and realization of the ultra-high-speed WLAN platform, including the physical layer, resource allocation scheme, and the implementation of the transmitter.