Effect of receive antenna directivity on RMS delay spread and coherence bandwidth for indoor millimetre wave mobile radio channels

The paper presents results of frequency domain measurements conducted using a channel sounder with a 2 GHz sweep bandwidth to characterise the effect of receive antenna directivity on the root mean square (RMS) delay spread and coherence bandwidth in a long narrow corridor in the band 63.4 GHz to 65.4 GHz. Measurements were conducted under identical test conditions using directional and omnidirectional receive antennas. The RMS delay spread (τ_rms) and coherence bandwidth (β_c) of the channel are also presented as functions of distance between terminals for both antenna configurations. The levels below which β_c stays for 90% of receiver positions are given for correlation factors of 0.9, 0.7 and 0.5, together with the cumulative distribution functions (CDFs) of τ_rms. The relationship between β_c and τ_rms is also presented.