Transmit or Receive diversity -
This is another multiple antenna technique employing multiple antennas at transmit and receive. This scheme employs the combination of antennas to achieve combinations of space-
time diversities,or delay diversity or frequency diversity.Space Time diversity coding (STC) -
This technique involves transmitting a given payload from different antennas (space diversity) and also at different times (time diversity). Delay Diversity -
Another form of STC, where a payload is transmitted with mathematically calculated delays from multiple antennas.Frequency Diversity -
In Frequency diversity a given payload is transmitted over different frequencies.Pattern Diversity -
Pattern diversity consists of two or more antennas separated with a small distance configured to transmit different radiation patterns. When combined it can achieve improved gain performances. Polarization diversity -
This technique deploys the phenomenon of Polarization among antennas. Polarization is not good for signal quality and a 90 degree polarized signal reduces the signal strength by 34 dB. In order to offset the effects of polarization a pairing of two complementary antennas are implemented to offset the distortions on signal quality.