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Description: 数字预失真在通信领域内IP核的开发文档，包括数学表达式及硬件框图-Digital Predistortion in the field of IP communications in the development of nuclear documents, including mathematical expression and hardware block diagram
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Size: 1397760 |
Author: 聂华 |
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Description: OFDM降低峰平比采用预失真技术，程序仿真了加入预失真技术后的星座图与未加预失真的比较。结果比较明显。采用QAM映射。-OFDM PAPR reducing the use of pre-distortion technology, process simulation technology to join the pre-distortion of the constellation diagram and the following not pre-distortion comparison. More obvious results.
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Size: 6144 |
Author: 以琳 |
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Description: 预失真的基本概念认识，预失真方法综述、比较与具体实现。-Understanding of the basic concepts of pre-distortion, pre-distortion Methods, Comparison and implementation.
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Size: 1231872 |
Author: 吴曼 |
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Description: Digital Predistortion of Nonlieaner RF Power Amplifier with Memory Effects.
This M code simulates a DPD technique linearization for a AB-class nonlinear HPA with memory effects. Here we consider a memory polynomial predistorter to modeling nonlinearity characteristics and memory effects of a HPA.Simulation procedures divided into three separate parts:
1)Analog imperfection compensation for the direct upconversion transmitter
2)Design a DPD based on a memory polynomial predistorter
3)Performance evaluation via a number of parameters such as:EVM,PSD,SNR,
-Digital Predistortion of Nonlieaner RF Power Amplifier with Memory Effects.
This M code simulates a DPD technique linearization for a AB-class nonlinear HPA with memory effects. Here we consider a memory polynomial predistorter to modeling nonlinearity characteristics and memory effects of a HPA.Simulation procedures divided into three separate parts:
1)Analog imperfection compensation for the direct upconversion transmitter
2)Design a DPD based on a memory polynomial predistorter
3)Performance evaluation via a number of parameters such as:EVM,PSD,SNR,
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Size: 37888 |
Author: shahram |
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Description: Digital Predistortion of Nonlieaner RF Power Amplifier with Memory Effects.
This M code simulates a DPD technique linearization for a AB-class nonlinear HPA with memory effects. Here we consider a memory polynomial predistorter to modeling nonlinearity characteristics and memory effects of a HPA.Simulation procedures divided into three separate parts:
1)Analog imperfection compensation for the direct upconversion transmitter
2)Design a DPD based on a memory polynomial predistorter
3)Performance evaluation via a number of parameters such as:EVM,PSD,SNR,
-Digital Predistortion of Nonlieaner RF Power Amplifier with Memory Effects.
This M code simulates a DPD technique linearization for a AB-class nonlinear HPA with memory effects. Here we consider a memory polynomial predistorter to modeling nonlinearity characteristics and memory effects of a HPA.Simulation procedures divided into three separate parts:
1)Analog imperfection compensation for the direct upconversion transmitter
2)Design a DPD based on a memory polynomial predistorter
3)Performance evaluation via a number of parameters such as:EVM,PSD,SNR,
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Size: 19976192 |
Author: shahram |
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Description: 这是一个关于预失真模型的matlab程序，同时里面结合了延时估计算法。-this is a matlab program about the model of digital predistorter,and uesed with the delay estimation algorithm.
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Size: 11264 |
Author: |
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Description: this matlab code presents a memory polynommial predistorter and a saleh model for the power amplifier
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Size: 1024 |
Author: shi |
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Description: this matlab code presents a ofdm digital predistorter using lut method and a saleh model for the power amplifier-this matlab code presents a ofdm digital predistorter using lut method and a saleh model for the power amplifier
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Size: 6144 |
Author: shi |
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Description: In this correspondence, we present a new Volterra-based predistorter,
which utilizes the indirect learning architecture to circumvent
a classical problem associated with predistorters, namely that the desired
output is not known in advance
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Size: 135168 |
Author: sali |
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Description: An efficient digital Volterrapredistorter ispresented to compensatefor nonlinear distortion with
memory induced by a broadband RF high power amplifier. The proposed approach is based on mixeddomain
Volterra system estimation and optimalpth-order inverse theory. Simulation results show that higher
performance and lower computational complexity are achieved compared to conventionalpredistortion.
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Size: 2108416 |
Author: sali |
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Description: Power amplifier is essential component in
communication systems and it’s inherently nonlinear. This essay
mainly investigate a based on Hammerstein predistorter , a
memory polynomial predistorter. The Hammerstein predistorter
is designed specifically for power amplifiers that can be modeled
as a Wiener system. The memory polynomial predistorter can
correct both the nonlinear distortions and the linear frequency
response that may exist in the power amplifier.
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Size: 167936 |
Author: sali |
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Description: Quadrature ampliltude modulation has high spectral efficiency but is highly sensitive to power amplifier
nonlinearities. It is shown that an adaptive predistorter usig polynomial amplitude and phase
predistortion functions can be used to linearize the power amplifier. Tie recursive least square algonrthm
is employed in an estimator which uses demodulated signals to estimate the required predistortion.
Computer simulation results are provided and these results show that fast convergence and high spectm
improvement can be obtained using the proposed linearization method. The results are significantly
better than those reported before for other linearization techniques.
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Size: 2683904 |
Author: sali |
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Description: This paper presents a comparative study on the
suitability of using Hammerstein or Wiener models to
identify the power amplifier (PA) nonlinear behavior
considering memory effects. This comparative takes into
account the operational complexity regarding the
identification process as well as their accuracy to follow the
PA behavior. Both identified PA models will be used to
estimate a Hammerstein based predistorter in order to see
which model combination provides better linearization
results. In addition, two adaptive algorithms for
predistorting both PA models are compared in terms of
accuracy and converge speed.
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Size: 276480 |
Author: sali |
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Description: The digital baseband predistorter is an effective technique to compensate for the nonlinearity of
power amplifiers (PAs) with memory effects. However, most available adaptive predistorters based on direct
learning architectures suffer from slow convergence speeds. In this paper, the recursive prediction error
method is used to construct an adaptive Hammerstein predistorter based on the direct learning architecture,
which is used to linearize the Wiener PA model. The effectiveness of the scheme is demonstrated on a digital
video broadcasting-terrestrial system. Simulation results show that the predistorter outperforms previous
predistorters based on direct learning architectures in terms of convergence speed and linearization. A similar
algorithm can be applied to estimate the Wiener PA model, which will achieve high model accuracy.
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Size: 238592 |
Author: sali |
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Description: The application of digital predistortion in base-band
signal is an extended method of amplifier linearization
to reduce the Adjacent Channel Interference (ACI) in
those systems in which a varying envelope modulation
scheme is used. This paper propose a particular
predistorter configuration and presents some design
considerations and simulation results in relation with the
use of fixed point Digital Signal Processor (DSPs). Less
than -60 dB out-of-band emission can be obtained for a
narrow bandwidth system.
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Size: 464896 |
Author: sali |
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Description: 预失真器simulink 仿真程序。有输入输出频谱和失真频谱效果图。-Predistorter simulink simulation program. Input output spectrum and distortion spectrum renderings.
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Size: 17799168 |
Author: 张军 |
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Description: 只是对数字预失真器的修复模型，基于对自适应处理延迟效果不佳问题，提出的改善方法。-Only the digital predistorter repair model, based on an ineffective adaptive processing delay problems and improve the method proposed.
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Size: 2048 |
Author: 刘晓晴 |
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