Reciprocity and repeatability of diversity measurements for on-body communication channels at 2.45 GHz

High diversity gains achieved for the on-body channels suggest that multipath due to the environment and the body both play a role in the propagation. The correlation of the diversity branches is low for most of the channels, which suggests that the diversity can provide very good improvement, if the power imbalance is carefully dealt with. The uplink and downlink diversity and correlation is reciprocal suggesting that the local off-body scattering environment is dominant. The diversity measurements are repeatable with a small error which is acceptable for most of the cases. The exact choice of demeaning window size is not critical as the diversity gain and correlation is fairly insensitive to the window size within a range of window size, which depends on the channel and the movements involved.