CAJ | 학술논문

针对电力线信道特性和噪声特性以及现有技术在鲁棒性和可靠性方面的不足,提出了一种适用于电力线环境的多带时频扩展OFDM(Multi-Band Time-Frequency Spreading OFDM,MB-TFS-OFDM)系统.该系统利用时频二维扩频技术来抵抗电力线信道的时变性和脉冲噪声,引入多带技术来克制脉冲噪声和窄带噪声,采用OFDM技术以抵抗符号间干扰、满足对速率的需求.与OFDM系统相比,MB-TFS-OFDM以牺牲G(扩频因子)倍的速率,获得10log(G) dB的增益;通过频带自适应选择和多带滤波,提高系统的鲁棒性.仿真结果显示,MB-TFS-OFDM性能优于OFDM和时频扩展OFDM(Time-Frequency Spreading OFDM, TFS-OFDM),尤其在脉冲噪声环境下,性能改善达5 dB.
침대전력선신도특성화조성특성이급현유기술재로봉성화가고성방면적불족,제출료일충괄용우전력선배경적다대시빈확전OFDM(Multi-Band Time-Frequency Spreading OFDM,MB-TFS-OFDM)계통.해계통이용시빈이유확빈기술래저항전력선신도적시변성화맥충조성,인입다대기술래극제맥충조성화착대조성,채용OFDM기술이저항부호간간우、만족대속솔적수구.여OFDM계통상비,MB-TFS-OFDM이희생G(확빈인자)배적속솔,획득10log(G) dB적증익;통과빈대자괄응선택화다대려파,제고계통적로봉성.방진결과현시,MB-TFS-OFDM성능우우OFDM화시빈확전OFDM(Time-Frequency Spreading OFDM, TFS-OFDM),우기재맥충조성배경하,성능개선체5 dB.
@@@@This paper proposes a Multi-Band Time-Frequency Spreading OFDM (MB-TFS-OFDM) system used in powerline environment in accordance with the characteristics of powerline channels and its noise, and the shortcomings of the existing technology in robustness and reliability. The system resists time variability of the powerline channels and the impulse noise through Time-Frequency Spreading technology, restrains the impulse noise and narrowband noise through the adoption of multiband technology, and resists the intersymbol interference and meets the need of speed through OFDM technology. Compared with the OFDM system, the MB-TFS-OFDM acquires a gain of 10*log (G) dB at the cost of G-times speed, and enhances the robustness of the system through the adaptive selection of the frequency band and multi-band filter. The simulation results show that the MB-TFS-OFDM performances are better than OFDM and Time-Frequency Spreading OFDM, with a performance improvement of 5dB under impulse noise environment.