Principles of Mobile Communication
Principles of Mobile Communication
On Limits of Wireless Communications in a Fading Environment when UsingMultiple Antennas
Wireless Personal Communications: An International Journal
Performance of multiantenna signaling techniques in the presence of polarization diversity
IEEE Transactions on Signal Processing
IEEE Transactions on Information Theory
Space-time block codes from orthogonal designs
IEEE Transactions on Information Theory
A simple transmit diversity technique for wireless communications
IEEE Journal on Selected Areas in Communications
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Multiple-input multiple-output (MIMO) wireless systems employ spatialmultiplexingto increase spectral efficiency or transmit diversity (space-time coding)techniques to improve link reliability.The performance of these signaling techniques is highly dependent on channelcharacteristics whichin turn depend on antenna height and spacing and richness of scattering. Theuse ofdual-polarized antennas is a cost- and space-effective alternative where twospatially separated uni-polarized antennas can be replaced by a singledual-polarizedantenna element. In this paper, we use fixed-wireless experimental datacollected in atypical suburban environment at 2.5 GHz to investigate the performance ofspatialmultiplexing and transmit diversity (Alamouti scheme) for a dual-polarizedantennasetup. Channel measurements were conducted over a cell of radius 7 km andchannel statistics such as K-factor, cross-polarizationdiscrimination (XPD), and fading signal correlation were extracted fromthe gathered data. At each location, differentcombinations of these parametersyield different performance (measured in terms of average uncoded bit errorrate)of spatial multiplexing and the Alamouti scheme.The results indicate that proper selection of the transmissionmode through feedback, if possible, can reduce thebit error rate by several orders of magnitude. Furthermore, the resultshint at the existence of a preferred-mode switching distance within a cell– above/below which one mode of transmission exhibits generally superiorperformance.