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We use stochastic network calculus to investigate the delay performance of amultiuser MISO system with zero-forcing beamforming. First, we consider idealassumptions with long codewords and perfect CSI at the transmitter, where weobserve a strong channel hardening effect that results in very high reliabilitywith respect to the maximum delay of the application. We then study the systemunder more realistic assumptions with imperfect CSI and finite blocklengthchannel coding. These effects lead to interference and to transmission errors,and we derive closed-form lower and upper bounds on the resulting errorprobability. Compared to the ideal case, imperfect CSI and finite length codingcause massive degradations in the average transmission rate. Surprisingly, thesystem nevertheless maintains the same qualitative behavior as in the idealcase: as long as the average transmission rate is higher than the arrival rate,the system can still achieve very high reliability with respect to the maximumdelay.

Delay Performance of the Multiuser MISO Downlink under Imperfect CSI and Finite Length Coding