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Exact(17)
Note that the estimates of the transmitted signals are based on (11).
Channel equalization is necessary in the receiver to mitigate the effect of ISI, in order to produce reliable estimates of the transmitted information.
For each iteration, we detect all MTs in a successive way, using the most updated estimates of the transmitted data symbols, associated with each MT to cancel the corresponding residual interference (see Figure 4).
The optimal channel estimation approach is to estimate all user channels jointly, making use of both pilots and soft estimates of the transmitted symbols, along with the channel correlation properties.
The decoded bits which are the estimates of the transmitted bits.
The estimates of the transmitted symbols are computed in three steps.
Similar(43)
Hence, an estimate of the transmitted symbol at time-index subject to the decision delay is obtained as (30).
Together with the channels' estimate, this block is now able to decode the received symbols, according to some decision rule, and generate the estimate of the transmitted data.
A filtering of the signal r ̃ k [ m, s ] is then applied to produce an estimate of the transmitted symbol x k [m, s].
Substituting (6) into (5) an estimate of the transmitted symbol on the th antenna at time-index can be obtained as (7).
Assuming this channel model, the linear MMSE estimate of the transmitted symbol s is given by ŝ = h ∗ y | h | 2 + N 0, (9).
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com