Research On Optimized Peak-to-Average Power Ratio OFDM System Resource Allocation In Power Line Communication

OFDM technology can overcome the existing problems such as multipath interference, complex frequency domain and so on in power line communication system, but its high peak to average ratio greatly reduces the utilization ratio of system power. Aiming at this problem, this paper regards the reduction of peak to mean ratio in electric power communication system as a point of entry, and the SC-FDMA technology is introduced to the power line communication system to propose a new method for reducing peak to average power ratio.Based on the analyses of traditional method for reducing PAPR. Firstly, the related technology of OFDMA technology in power line communication system are studied and summarized and put forward that SC-FDMA technology is introduced to the power line communication system. Moreover, its feasibility is analyzed in theory. Secondly, through the compared simulation of subcarrier and power needed for peak to average ratio CCDF and fixed throughput of OFDMA and SC-FDMA technology in power line, the method that could reduce the peak to average power ratio and is applied to power communication system is verified. Besides, the resource utilization ratio of the system is improved. Finally, the modeling of the optimized power line communication system is analysed. Combining power and Max-Min algorithms, this paper puts forward two kinds of adaptive resource allocation algorithm in power line communication system on the SC-FDMA technology. Comparison results of these algorithms at a given target rate and different power system throughput show that the improved algorithm could improve the utilization ratio of the system significantly.