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Proper selection of a Signal-to-Noise Ratio (SNR) threshold largely determines the tightness of an approximation to the frame error rate of a system over a quasi-static fading channel. The authors demonstrate that the expression for the optimal threshold value, which has been established for Single-Input Single-Output (SISO) channels, remains unchanged for the general case of Multiple-Input Multiple-Output (MIMO) channels. In various practical systems, such as fixed wireless access networks, the communication channel experiences extremely slow fading conditions that can be characterised by the quasi-static fading model.
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