Spatial Diversity and Correlation for Off-Body Communications in Indoor Environments at 868 MHz

For the first time, cross-correlation values for the fading experienced for antennas mounted at different locations on the upper human torso are reported. Time-synchronized narrowband measurements at 868 MHz have demonstrated that when the human body is mobile, signal branches on the upper limbs, an...

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Bibliographic Details
Main Authors: Cotton, S.L., Scanlon, W.G.
Format: Conference Proceeding
Language:English
Subjects:
Abdomen
Antenna measurements
Diversity methods
Diversity reception
Fading
Humans
Indoor environments
Mobile communication
Narrowband
Torso
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Summary:For the first time, cross-correlation values for the fading experienced for antennas mounted at different locations on the upper human torso are reported. Time-synchronized narrowband measurements at 868 MHz have demonstrated that when the human body is mobile, signal branches on the upper limbs, anterior chest, abdomen and back shoulders are adequately de-correlated with cross-correlation coefficients no greater than 0.6. Selection, maximal ratio and equal gain diversity combining techniques were used to combine spatially separated branches, with up to 9.6 dB diversity gain for a system operating with left chest and back right positioned antennas. When six bodyworn diversity branches are available, maximal ratio and equal gain combining eradicate all fades beyond 3 dB below the local mean signal level.
ISSN:1550-2252
DOI:10.1109/VETECS.2007.88