In a fast-fading channel, where the latency requirement is greater than the coherence time and the codeword length spans many coherence periods, one can average over many independent channel fades by coding over a large number of coherence time intervals. Thus, it is possible to achieve a reliable rate of communication of E ( log 2 ⁡ ( 1 + | h | 2 S N R ) ) {\displaystyle \mathbb {E} (\log _{2}(1+|h|^{2}SNR))} [bits/s/Hz] and it is meaningful to speak of this value as the capacity of the fast-fading channel.