A new digital front end structure for cognitive PLC systems

2015 IEEE International Symposium on Power Line Communications and Its Applications (ISPLC) Pub Date : 2015-03-01 DOI:10.1109/ISPLC.2015.7147623

Hongjian Gao, G. Bumiller, Weilin Liu, Lijianqi

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引用次数: 1

Abstract

Power line channel is hostile for communication. One concept we proposed for reliable communication in power line is to adjust the working band according to different channel conditions. In this paper, a new digital front end (DFE) structure, which combines equivalent complex baseband (ECB) structure and Nyquist windowing at both transmitter and receiver, is proposed to support this concept. By configuring parameters of ECB, it supports flexibly band selection. Besides, out-of-band interference is able to be attenuated to a large extent due to the cascaded low-pass filters in the ECB at receiver. Therefore, it is possible to apply much more simplified analogue front end. The Nyquist windowing at receiver makes side-lobe of narrowband disturbance fall down quickly and concentrates its energy on fewer subcarriers, which benefits the narrowband interference detection. Finally, system performance with the new DFE structure in the presence of in-band and out-of-band disturbance is simulated and compared with classic DFE and equivalent complex baseband (ECB)-based DFE.

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认知PLC系统的一种新型数字前端结构

电力线信道不利于通信。为了保证电力线的可靠通信，我们提出了根据不同的信道条件调整工作频带的概念。本文提出了一种新的数字前端(DFE)结构，该结构结合了等效复杂基带(ECB)结构和发送端和接收端的奈奎斯特窗，以支持这一概念。通过配置ECB的参数，可以实现灵活的频段选择。此外，由于接收器ECB中的级联低通滤波器，可以在很大程度上衰减带外干扰。因此，可以应用更简化的模拟前端。接收机的奈奎斯特加窗使得窄带干扰的旁瓣迅速下降，并将其能量集中在较少的子载波上，有利于窄带干扰的检测。最后，对存在带内和带外干扰时的系统性能进行了仿真，并与经典DFE和等效复杂基带(ECB) DFE进行了比较。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2015 IEEE International Symposium on Power Line Communications and Its Applications (ISPLC)

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