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For uncorrelated channels, a closed form expression is derived for the optimal pilot sequence, number of pilot subcarriers and pilot locations.
Pilot sequence hopping means that every user chooses a new pilot sequence in each time slot.
However, such pilot sequence does not always exist.
where τ is the length of pilot sequence.
Pilot sequence hopping is a technique where the UEs randomly switch to a new pilot sequence in between time slots.
In this case, we use the Chu pilot sequence given by ; [20].
The channel reestimation and detection procedure continued until the next pilot sequence started.
Pilot sequence hopping: This component refers to random shuffling of the pilots applied within a cell.
Random pilot sequence hopping is illustrated in Fig. 4 in the case of τ=K=5.
GA-based approach algorithm is used to generate the pilot sequence, as well.
Substituting the specifically designed pilot sequence (10) into (8), we have.
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