Line-of-sight MIMO for microwave links - Adaptive dual polarized and spatially separated systems

With mass uptake of mobile broadband such as HSPA, LTE and advanced LTE there will be a rapid increase of demand for capacity in the mobile backhaul. The traditional frequency bands used for mobile backhaul microwave links are narrow and may become a future capacity bottleneck. Line-of-sight MIMO is one possible technology for increasing the spectral e ciency of these links. By using multiple antennas at both the transmitter and receiver the capacity of such systems could be multiplied using the same spectrum. Line-of-sight MIMO works by making the signal streams orthogonal to each other either by spatially separating the antennas at the transmitter and receiver or by using orthogonally polarized antennas. In this thesis both 2x2 spatially-separated and 4x4 spatially-separated and dual-polarized line-of-sight MIMO are numerically investigated. Adaptive algorithms for a space-timeequalizer are proposed and evaluated against detrimental a ects such as frequency selective channels, mast swing (antenna movement), polarization leakage and phase noise (correlated and di erential). The algorithms are either decision-directed or blind, those are LMS and WRLS and CMA, SCMA and MCMA respectively. The simulations show that line-of-sight MIMO needs higher system margins and a more complex receiver structure. Convergence of blind algorithms can be di cult to achieve for some channel conditions as well as for di erential phase noise. Mast swing will further more put higher requirements on spatially-separated MIMO systems than on its SISO counterpart.

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