I was given a screenshot showing 3 APs in a conference setting and asked to determine how to solve the problem of "extremely slow" internet speed. I suspect it is adjacent channel interference (ch. 6, 7 and 8 are used) but the signal level of -88 is a bit confusing. Even with adjacent channels, shouldn't the signal strength be greater than -88 within 150' in an open room (no barriers)?

Screenshot shows:

AP#1 Encryption: WPA2 Signal: -88 Noise: -94 2.4GHz Ch: 6

AP#2 Encryption: WPA2 Signal: -88 Noise: -94 2.4GHz Ch: 7

AP#3 Encryption: WPA2 Signal: -88 Noise: -94 2.4GHz Ch: 8

Screenshot shows:

AP#1 Encryption: WPA2 Signal: -88 Noise: -94 2.4GHz Ch: 6

AP#2 Encryption: WPA2 Signal: -88 Noise: -94 2.4GHz Ch: 7

AP#3 Encryption: WPA2 Signal: -88 Noise: -94 2.4GHz Ch: 8