Coherence bandwidth characterisation for 4th generation WLANs

Wideband propagation measurements undertaken in two different worst case broadband WLANs indoor radio channels to measure spaced-frequency correlation functions are presented. The 90th percentile values of the coherence bandwidth at correlation level of 0.9 for all locations stay below 72 MHz. Minimum and maximum B_0.9 coherence bandwidths obtained in a long narrow corridor with a directional horn transmit and an omnidirectional receive antenna are 1.10 MHz. and 105.33 MHz respectively. It has been observed that the coherence bandwidth is highly variable with the location of the receiver with respect to the base station.