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首页> 外文OA文献 >Design and implementation of adaptive baseband predistorter for OFDM nonlinear transmitter. Simulation and measurement of OFDM transmitter in presence of RF high power amplifier nonlinear distortion and the development of adaptive digital predistorters based on Hammerstein approach.
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Design and implementation of adaptive baseband predistorter for OFDM nonlinear transmitter. Simulation and measurement of OFDM transmitter in presence of RF high power amplifier nonlinear distortion and the development of adaptive digital predistorters based on Hammerstein approach.

机译：OFDM非线性发射机自适应基带预失真器的设计与实现。射频大功率放大器非线性失真下OFDM发射机的仿真与测量以及基于Hammerstein方法的自适应数字预失真器的开发。

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The objective of this research work is to investigate, design and measurement of a digitaludpredistortion linearizer that is able to compensate the dynamic nonlinear distortion of a HighudPower Amplifier (PA). The effectiveness of the proposed baseband predistorter (PD) on theudperformance of a WLAN OFDM transmitter utilizing a nonlinear PA with memory effect isudobserved and discussed. For this purpose, a 10W Class-A/B power amplifier with a gain of 22uddB, operated over the 3.5 GHz frequency band was designed and implemented.udThe proposed baseband PD is independent of the operating RF frequency and can be used inudmultiband applications. Its operation is based on the Hammerstein system, taking into accountudPA memory effect compensation, and demonstrates a noticeable improvement compared toudmemoryless predistorters.udDifferent types of modelling procedures and linearizers were introduced and investigated, inudwhich accurate behavioural models of Radio Frequency (RF) PAs exhibiting linear andudnonlinear memory effects were presented and considered, based on the Wiener approachudemploying a linear parametric estimation technique. Three new linear methods of parameterudestimation were investigated, with the aim of reducing the complexity of the required filteringudprocess in linear memory compensation. Moreover, an improved wiener model is represented toudinclude the nonlinear memory effect in the system. The validity of the PA modelling approachesudand predistortion techniques for compensation of nonlinearities of a PA were verified by severaludtests and measurements. The approaches presented, based on the Wiener system, have theudcapacity to deal with the existing trade-off between accuracy and convergence speed comparedudto more computationally complex behavioural modelling algorithms considering memoryudeffects, such as those based on Volterra series and Neural Networks.udIn addition, nonlinear and linear crosstalks introduced by the power amplifier nonlinearudbehaviour and antennas mutual coupling due to the compact size of a MIMO OFDM transmitterudhave been investigated.
机译：这项研究工作的目的是研究，设计和测量能够补偿高 udPower放大器（PA）的动态非线性失真的数字 udpredistortion线性化器。本文提出并讨论了所提出的基带预失真器（PD）对利用具有存储效应的非线性PA的WLAN OFDM发射机的性能的影响。为此，设计并实现了在3.5 GHz频带上工作的增益为22 uddB的10W A / B类功率放大器。 ud提议的基带PD与工作RF频率无关，可用于 udmultiband应用。它的操作基于Hammerstein系统，并考虑了 udPA记忆效应补偿，并且与 udmemory预失真器相比，显示出明显的改进。 ud引入并研究了不同类型的建模过程和线性化器，从而建立了精确的无线电行为模型基于Wiener方法采用线性参数估计技术，提出并考虑了表现出线性和超非线性记忆效应的频率（RF）PA。为了降低线性记忆补偿中所需的滤波 udprocess的复杂性，研究了三种新的参数线性化线性方法。此外，改进的维纳模型被表示为包括系统中的非线性记忆效应。通过多次测试和测量验证了PA建模方法 UD和预失真技术对PA非线性补偿的有效性。所提出的基于Wiener系统的方法具有 udap能力，可以处理精度与收敛速度之间的现有折衷，相比于考虑到内存 udeffects（例如基于Volterra系列和Neural的那些）的更多计算复杂的行为建模算法网络。另外，还研究了由于MIMO OFDM发射机的紧凑尺寸而导致的功率放大器非线性行为和天线相互耦合引入的非线性和线性串扰。

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