通过收窄期望波的频带来评估无线局域网电磁干扰特性的方法

2009 20th International Zurich Symposium on Electromagnetic Compatibility Pub Date : 2009-02-13 DOI:10.1109/EMCZUR.2009.4783492

H. Koyama, M. Tokuda, Noboru Fujita

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引用次数: 3

摘要

我们通过使用放置在无线电消声室中的开放式平行有线(PW)单元来评估无线局域网的电磁干扰特性。我们使用了一种新的窄带WLAN系统来进行这项评估，我们一直在开发该系统，以减少电磁干扰问题并增加信道数量，以便许多系统可以在同一位置同时使用该系统。因此，我们发现10 MHz和5 MHz的WLAN系统比信道间隔为20 MHz的传统WLAN系统在处理IEC 61000-4-3标准规定的窄带宽干扰波以及WLAN IEEE802.11b标准规定的宽带宽干扰波时，可以更好地提高PER特性。此外，当将IEEE802.11b波打入10 mhz系统时，与打入20 mhz系统相比，在D/U信号功率比上，对Ch. 1和Ch. 2的PER特性提高了约20 dB，对Ch. 3的PER特性在D/U上提高了约30 dB。

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Method of evaluating electromagnetic-interference characteristics of wireless LANs by narrowing frequency bandwidth of desired waves

We evaluated the electromagnetic-interference characteristics of WLANs by using an opened Parallel Wired (PW) cell that is placed in a radio anechoic chamber. We used a new narrowband WLAN system to do this evaluation, which we have been developing to reduce electromagnetic-interference problems and increase the number of channels so that many systems can use this simultaneously in the same location. As a result, we found that 10- and 5-MHz WLAN systems can improve the PER characteristics more than a conventional WLAN system with a channel spacing of 20 MHz when impressing an interference wave with a narrow bandwidth such as that specified by the IEC 61000-4-3 standards as well as that with a wide bandwidth such as that specified by the WLAN IEEE802.11b standards. In addition, when impressing the IEEE802.11b wave to the 10-MHz system, the PER characteristics to Chs. 1 and 2 were improved by about 20 dB on the desired-to-undesired (D/U) signal power ratio and those to Ch. 3 were improved by about 30 dB on D/U compared with impressing an interference wave to a 20-MHz system.

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2009 20th International Zurich Symposium on Electromagnetic Compatibility

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