Farfield&Antenna / Diversity Gain and Correlation (from Farfield)
Result Templates Template Based Post Processing
This template alternatively calculates the Mean Effective Gain (MEG)
of an antenna or the correlation, diversity gain and multiplexing efficiency
of two antennas in a MIMO antenna system (using antenna diversity).
Note: a
broadband version of most functionality is included in Farfield&Antenna
/ Farfield Result
Mean Effective Gain:
This model assumes that an isotropic power distribution
over all angles is an unlikely model for ground based mobile communication.
Instead a Gaussian distribution over the elevation angle is assumed. The
Gaussian distribution can be described independently for the vertical
and the horizontal component:
The cross polarization ratio (XPR) between vertical
and the horizontal component is defined as follows:
Reference: T. Taga, 鈥淎nalysis for mean effective
gain of mobile antennas inland mobile radio environments鈥? IEEE Trans.
Veh. Technol., vol.39, no.2, pp.117鈥?31, May 1990.
MIMO Antennas and Antenna Diversity:
Antenna Diversity describes the case that more
than one antenna is implemented in a device. To specify the benefit of
multiple antennas, the correlation of two antennas or the diversity gain
are evaluated. In this template both values are calculated from the Farfield
Pattern according to the formulas:
Envelope Correlation:
P_胃 (惟) and P_桅 (惟) describe the Gaussian distributions
as shown above.
In case of isotropic power distribution (P_胃
(惟)=P_桅 (惟)=1), no cross polarization ratio (XPR = 0dB) and a lossless
structure, the correlation 蟻_env equals the correlation calculated from
S-Parameters (Farfield&Antenna
/ Diversity Gain and Correlation (from S-Parameters))
Diversity Gain:
Multiplexing Efficiency:
The multiplexing efficiency ME is defined from
the envelope correlation and the gain of the two antennas G_1and G_2 (in
dB) according to the formula
See also
Farfield&Antenna
/ Farfield Result, Farfield&Antenna
/ Diversity Gain and Correlation (from S-Parameters), Preloaded
Result Templates, Preloaded
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