polarization diversity vs angle diversity | Difference between polarization diversity and angle diversity

This page compares polarization diversity vs angle diversity and mentions difference between polarization diversity and angle diversity.

polarization diversity

• It uses antennas of different polarizations i.e. horizontal and vertical as shown in the figure.
• Multiple versions of a signal are transmitted and received via antennas with different polarization.
• A diversity combining technique is applied on the receiver side.
• In polarization diversity technique antennas take advantage of multipath propagation characteristics to receive separate uncorrelated signals.
• Using this diversity technique, SNR is improved by upto 12 dB even in LOS channels.
• As shown one dual-polarized antenna can be used using polarization diversity technique. Here both the polarizations must be orthogonal such as horizontal/vertical or +/-45i slanted with respect to each other.
• Dual-Polarization Diversity is used for MIMO beamforming in 5G Millimeter-Wave system.

angle diversity

• This technique uses multiple antenna beams in order to receive multipath signals which are arriving at different angles.
• The angle diversity method uses multiple receiving elements which are oriented in different directions. Each of the antenna elements employs its own unique filter and non-imaging concentrator.
• Hemispheric lens or CPC (compound parabolic concentrator) is used as concentrator.
• It offers better performance compare to infrared channel characteristics.
• The multibeam transmitter along with angle diversity receivers is used in order to reduce effect of path loss, ambient light noise and multi-path distortion.

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