Summary
International Symposium on Electromagnetic Compatibility
2009
Session Number:22P1
Session:
Number:22P1-3
Method of Evaluating Electromagnetic-Interference Characteristics of MIMO Wireless LANs
H. Koyama, M. Tokuda, N. Fujita,
pp.269-272
Publication Date:2009/7/20
Online ISSN:2188-5079
Summary:
We evaluated the electromagnetic-interference characteristics of MIMO (Multiple Input Multiple Output ) WLAN (Wireless Local Aria Network) by using an opened PW (Parallel Wired) cell that was placed in a radio anechoic chamber. We used two types of the interference wave such as the narrowband AM (Amplitude Modulation) wave specified by the IEC 61000-4-3 standards and the broadband communication signal of a WLAN specified by the IEEE802.11b standards. When impressing the AM wave as the narrowband interference, it was clear that the throughput characteristic of MIMO WLAN for all channels from Ch.1 to ch.4 was the same order and only about 5dB better than that for the conventional WLAN. On the other hand, when the communication wave of WLAN IEEE802.11b was impressed to Ch.1 and Ch.2 included in the occupied bandwidth of MIMO WLAN as the broadband interference, it was revealed that the throughput characteristic of MIMO WLAN deteriorated remarkably and the power ratio D (Desired wave) /U (Undesired wave) given the same throughput increased about 60dB.