Correction Factor for Analysis of MIMO Wireless Networks With Highly Directional Beamforming.
Most theoretical studies for multiple input multiple output (MIMO) wireless networks with beamforming model the actual received signal power as a product of some fixed antenna gain and the nominal received signal power. The nominal received signal power being that from an omni-directional transmission on a single input single output (SISO) link. Since the power angular spectrum is often significantly different for line of sight (LOS) and non-LOS (NLOS) links, multiplying the same antenna gain for both LOS and NLOS links leads to erroneous estimates of the actual received signal power. We quantify the difference in effective antenna gain for NLOS and LOS links as a function of number of dominant paths in the channel using a popular narrowband geometric channel model, when the number of antennas at the transmitter and receiver is large. We call this difference the correction factor. Using the recent New Radio (NR) 3GPP channel model we confirm that the effective antenna gain for NLOS links can be about 10 dB lower than for LOS links.
Publisher URL: http://arxiv.org/abs/1710.07369