PAPR/ENOB对通信系统性能影响的仿真方法

The Effect of PAPR/ENOB in the OFDM Communication System

介绍正交频分复用 OFDM(Orthogonal Frequency Division Multiplexing)系统中降低峰均比 PAPR(Peakto Average Power Ratio)的方法。考虑到 80 2 .1 1 .g系统的兼容性 ,可用过采样限幅处理降低 PAPR。由于是 OFDM系统PAPR,因而对模拟器件的性能要求比较严格。文中给出了进行 ADC/DAC(模数转换 /数模转换 ,Analog to DigitalConvert/Digital to Analog Convert)和放大器仿真的模型和方法 ,并应用到 80 2 .1 1 .g系统设计中 ,得到了系统中模拟器件选择的一些指导参数。该方法对系统设计中模拟器件参数的选取有一定的参考价值。利用放大器软限幅特性以及ADC/DAC有效位数的模型可以进行整个系统中定点性能仿真。

This paper overviews the method of reducing OFDM P AP R and analysis the feature of the 802.11.g.We can conclude that the oversamples clipping could reduce the PAPR of the 802.11.g.Because of the large PAPR,this sy stem requires the analog devices with high performance.The feature of ADC/DAC an d amplifier will affect the performance of DSP systems.In this paper we analyzes their feature and simulative models,with which we investigate the performance o f wireless local area network system based on IEEE 802.11.g standard implemented with fix point DSPs.The amplifier and Effective Number Of Bits(ENOB)model are u sed to simulate the fix point performance of DSP.We will provide the test result s with different device's parameters which are important for system designers.T his method of simulator is very useful for system design.