Time Dispersion Parameters Of Indoor Self-Interference Radio Channels In Sub-7-Ghz Bands

In full-duplex wireless communication systems, knowledge about the self-interference channel must be acquired to cancel the self-interference signal. This paper presents results' analysis of indoor measurements of multi-path self-interference wireless propagation channels. Three polarimetric self-interference radio channels were concurrently measured. The measurements were performed by means of a vector network analyzer, which was configured to sweep three gigahertz of bandwidth; distributed equally over three scattered frequency bands. These bands are: 2-to-3-GHz band, 3-to-4-GHz band, and 5.9to-6.9-GHz band. The sweeps captured scattering-parameters, which hold the frequency responses of the self-interference propagation channels. A dually-polarized open boundary quad ridged horn antenna was used to observe the polarimetric self-interference channels. Antenna's ports were connected to two test ports of the vector network analyzer. The measurement setup allowed us to capture two orthogonal co-polar self-interference channels and one cross-polar self-interference channel. The channels were measured in a modern and spacious office environment. The antenna was at two and half meter height to be sequentially positioned along the office circumference at 25 different locations - sounding the self-interference channels. The averaged power delay profiles of all three self-interference channels are presented and compared among three sounded bands. Furthermore, the time dispersive behavior of the self-interference wireless channels has been statistically analyzed.