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放大器非线性、记忆性和饱和性失真导致宽带OFDM系统误码率性能和功率效率低.为解决上述问题,文中提出基于多个小动态范围放大器联合放大的放大器动态范围扩展方法,纠正放大器的饱和性失真;同时,提出一种简化滤波查表预失真方法,该方法由一个无记忆预失真器子系统串联一个自适应滤波器子系统构成,能有效的纠正放大器有记忆非线性失真.仿真表明,两种方法的联合使用可以有效的纠正放大器失真带来的影响,提高系统功率效率和误码率性能.
Amplifier nonlinearity, memory loss and saturation distortion result in low bit error rate performance and low power efficiency in wideband OFDM systems.In order to solve the above problems, the dynamic range expansion method of amplifiers based on the combination of multiple small dynamic range amplifiers is proposed to correct the saturation of the amplifier At the same time, a new method to simplify the filter look-up table pre-distortion is proposed. The method consists of a memoryless predistorter subsystem connected in series with an adaptive filter subsystem, which can effectively correct the amplifier’s nonlinear distortion of memory. The combined use of these two methods can effectively correct the effects of amplifier distortion and improve system power efficiency and bit error rate performance.