Abstract :
It is a common belief that multiple transmit antennas have to be placed far apart in order to avoid undesired effects such as mutual coupling, changing beampatterns, antenna mismatching losses, and correlation. The following radio communication setup is considered: two lambda/4-monopole ground-plane transmit antennas, a single receive antenna, 4QAM modulation, Alamouti space-time coding, uncoded single carrier transmission at 2.4 GHz, indoor scenario. By measurements, the impact of very low transmit antenna spacing on the average uncoded BER over transmit-power performance of such a radio link, therefore accounting for all losses in the transmission chain, is examined. The common belief that multiple transmit antennas have to be placed far apart cannot be confirmed
Keywords :
UHF antennas; antenna arrays; antenna radiation patterns; error statistics; radio links; transmitting antennas; 2.4 GHz; 4QAM modulation; Alamouti radio transmission; Alamouti space time coding; ground plane transmit antennas; multiple transmit antennas; radio communication; radio link; single carrier transmission; single receive antenna; transmit antenna spacing;
