Evaluation of interference between MB-OFDM UWB and wireless LAN systems using a GTEM cell

In this study, the electromagnetic interference of an MB-OFDM UWB system with an IEEE802.11a wireless LAN was evaluated using a GTEM cell. Band #3 (out-of-band radiation for 11a) in the band plan of the MB-OFDM UWB system and Band #4 (in-band radiation for 11a) were assumed to be two different types of interference. As a result, when the frequencies of the MB-OFDM UWB corresponded to Band #3, the MB-OFDM UWB system may not interfere with the wireless LAN. In the other band, although the interference power of the MB-OFDM UWB was less than the receiver noise of the wireless LAN, the MB-OFDM UWB system interfered with the wireless LAN. In addition, the separation distance was evaluated from the power inputted to the GTEM cell. As a result, for the vicinity of the minimum receiver sensitivity of the wireless LAN, the separation distance was about 3 m. Finally, the amplitude probability distribution (APD) of the MB-OFDM UWB system that was the interference source was evaluated. As a result, the APD characteristics of MB-OFDM UWB were slightly different from those of additive white Gaussian noise (AWGN).