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On the LHS we can BER for ZF in CDL-A,B,C channels (NLoS) and on the RHS - CDL- D,E (LoS). There are 6 curves on each. The reference curve (black) represents performance of the 2x2 MIMO receiver in Rayleigh channel. The rest are different antenna configurations. Since performance of Cpol-Cpol is heavily dependent on the slant angle, we consider three scenarios: 1) worst - orthogonal positioning of Tx-Rx (slant=90) 2) best - aligned positioning of Tx-Rx (slant=0) 3) random positioning (slant = 0~90). For other two configurations, only random placement is considered. On the figure we can see, that when Cpol-Cpol is at it best scenario the performance matches those of the Rayleigh channel, while for worst alignment, the performance is off by a lot. In realistic scenario, orientation is random and performance is also located between best and worst (4db off Rayleigh). Interestingly performance of Xpol-Xpol configuration for random orientation is quite close to the Rayleigh channel, which gives it advantage over Cpol-Cpol configuration. Similar situation can be observed for NLoS scenario, however here the performance of Cpol is further off due to strong signal correlation at Rx antennas.
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IEEE/ICACT20210112 Slide.11
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