论文标题

使用基于SVM的接收器的联合通道估计和数据解码

Joint Channel Estimation and Data Decoding using SVM-based Receivers

论文作者

Akın, Sami, Penner, Maxim, Peissig, Jürgen

论文摘要

现代通信系统在块中组织接收器,以简化其分析和设计。但是,一种从更广泛的角度考虑接收器设计而不是对其进行划分的方法可以利用这些块的影响彼此的影响并提供更好的性能。在此,我们可以从机器学习中受益,并构成实施监督学习技术的接收器模型。通过这种动机,我们考虑了一个在平坦的快速褪色的无线通道上的一对一传输系统,并提出了基于支持向量机(SVM)的接收器,该接收器结合了一个基于飞行员的通道估计,数据解调和解码过程,以一个联合操作结合使用。我们遵循接收器设计中的两种技术。我们首先设计了一个基于SVM的分类器,该分类器输出了进入发射器侧编码器的编码代码字的类。然后,我们在编码编码字中提出了一个带有一个基于SVM的分类器的模型,每个分类器在编码向量中分配了相应位的值。使用第二种技术,我们简化了接收器设计,尤其是对于更长的编码编码编码。我们表明,基于SVM的接收器的性能非常接近最大似然解码器,当发射机的编码向量同样可能时,已知是最佳解码策略。我们进一步表明,基于SVM的接收器的表现优于执行通道估计,数据解调和解码的常规接收器。最后,我们证明我们可以使用1位模数转换器(ADC)输出训练基于SVM的接收器,并且基于SVM的接收器可以与将32位ADC输出作为输入的传统接收器非常紧密地执行。

Modern communication systems organize receivers in blocks in order to simplify their analysis and design. However, an approach that considers the receiver design from a wider perspective rather than treating it block-by-block may take advantage of the impacts of these blocks on each other and provide better performance. Herein, we can benefit from machine learning and compose a receiver model implementing supervised learning techniques. With this motivation, we consider a one-to-one transmission system over a flat fast fading wireless channel and propose a support vector machines (SVM)-based receiver that combines the pilot-based channel estimation, data demodulation and decoding processes in one joint operation. We follow two techniques in the receiver design. We first design one SVM-based classifier that outputs the class of the encoding codeword that enters the encoder at the transmitter side. Then, we put forward a model with one SVM-based classifier per one bit in the encoding codeword, where each classifier assigns the value of the corresponding bit in the encoding vector. With the second technique, we simplify the receiver design especially for longer encoding codewords. We show that the SVM-based receiver performs very closely to the maximum likelihood decoder, which is known to be the optimal decoding strategy when the encoding vectors at the transmitter are equally likely. We further show that the SVM-based receiver outperforms the conventional receivers that perform channel estimation, data demodulation and decoding in blocks. Finally, we show that we can train the SVM-based receiver with 1-bit analog-to-digital converter (ADC) outputs and the SVM-based receiver can perform very closely to the conventional receivers that take 32-bit ADC outputs as inputs.

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