一种基于MATLAB的DPD仿真设计

Design and Simulation of DPD Based on MATLAB

在WCDMA、LTE等无线通信系统中,高的峰平比(PAPR)对功放线性性和效率提出了更高的要求。自适应预失真技术是一种用于补偿高功率放大器非线性失真的有效技术。介绍了数字预失真的原理、模型,并通过在MATLAB中的仿真,提出一种合适的系数量化方法,最后给出一种基于MATLAB的数字预失真器设计。仿真结果表明,该设计有效地补偿了功放的非线性,降低了信号的邻近信道泄漏比以及系统功耗,提高了系统的性能。

In wirelesss communication system,such as WCDMA, LTE high peak-to-average power ratios make a higher requirement to the nonlinener and efficiency of power amplifier. Adaptive predistortion technique is an effective technique to compensate for the nonlinear distortion of high power am- plifier. A principle of digital predistortion and its model are introduced in this paper. Through the simulation in MATLAB, a proper coefficient quantization method is put forward , at last a design of digital predistortion which is based on MATLAB is given. Simulation restdts show that the design compensates the nonlinearity of power amplifier, reduces the adjacent channel leakage rate of signal and power in system, and improves the performance of the system effectively.