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Research and Implementation of FPGA- OFDM system PAPR - based algorithms

Author: XiaoHanJie
Tutor: ZuoHeng
School: University of Electronic Science and Technology
Course: Access to information and detection technology
Keywords: OFDM Peak to Average Power Ratio Bit Error Rate idle sub-carriers FPGA
CLC: TN919.3
Type: Master's thesis
Year: 2011
Downloads: 41
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Abstract


Orthogonal frequency division multiplexing (OFDM), according to the advantages of its high spectrum efficiency and strong resistance to multipath delay, has been researched by domestic and foreign scholars. OFDM is considered by one of the key technology for the next generation mobile communication. However, the high PAPR(peak to average power ratio) of OFDM system becomes its application bottlenecks. The high PAPR brings the stringent requirements to the linearity of power amplifiers and DAC. If they cannot meet the requirements, the nonlinear distortion would destroy the orthogonality condition among subcarriers, then greatly degrades communication link performance. Therefore, it is necessary to study how to reduce peak to average power ratio of OFDM system. Scholars have done a lot of research to solve this problem.This paper analyzes the OFDM system, and introduces the principle of OFDM system and the generation of PAPR in OFDM system. It emphasizes on the introduction of signal pre-distortion and probability algorithm technology, and performs the simulation on this technology to analyze the reduction of PAPR and the loss of error rate.Based on the existed algorithms, the improvement is researched: firstly, the simplified methods of pre-judgment and adaptive algorithm are researched; this program is capable of simplifying the implementation complexity of algorithm without influencing system PAPR performance. Secondly, a new method is researched as selected mapping, which utilizes the transmission of different position information on idle subcarriers instead of sideband information. This method is not required to insert new sideband information into original OFDM symbol. The rotation factor detection can be realized simply and reliably, with advantage of no influence on spectrum efficiency and no loss of error rate. Thirdly, the combined improvement scheme of selected mapping technology and peak offset technology is researched. It fixes the defects of insufficient of reduction on PAPR by probability algorithm and the error rate by signal distortion algorithm, and performs the simulation based on FPGA, and then verifies the practicability.In conclusion, the principle of PAPR generated in OFDM system is elaborated thoroughly. Aiming at this problem, the improvement scheme is researched and the simulation based on FPGA is performed to finalize the algorithm, expect to make an effect on application and solution of PAPR of OFDM system.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Data communication > Data transmission technology
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