I'm working on linking four offshore oil platforms with bridged point-to-point 802.11g links. 802.11g says radios must have at least 4 dB adjacent channel rejection (ACJ) for not more than 10% packet error rate (@36 Mbps data rate). I have measured an ACJ of 11 dB. System gain is 99 dB so I figured I need 88 dB of antenna isolation. When explaining this to client, he said overlaying the three available channels with collocated APs is common practice. In a typical indoor installation with collocated APs, isolation between antennas is likely to be only 40-50 dB. How can this work without greatly compromising range?
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