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The long training sequence is used for localization.
The header comprises the short training sequence (STS), the long training sequence (LTS), and the signal field (SF).
Moreover, when DFE works in direct-decision mode, even extremely long training sequence is adopted, they can only reach the best BER performance of around 2.0×10−3.
Two periods of the long sequence are transmitted to improved channel estimation accuracy, yielding the total duration of the long training sequence, T G + 2T = 8 μ s.
This comes at the cost of a heavier computational load, and the need for a long training sequence, which needs to be updated over time.
An experiment over a long training sequence extracted from the TIMIT database shows that each codeword is selected from an unvoiced codebook with an average probability of 1/3.
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If you're not a martial-arts fan, though, things can bog down a bit during the long training sequences, when we're shown how to knee our opponent in the solar plexus or pummel him in the side with a metal rod.
dIt consists of the short and the long training sequences and a SIGNAL field.
Moreover, in case of adaptive equalization, long training sequences are required for good convergence, which consequently reduces the overall system efficiency.
The perfect CSI hypothesis is abandoned, and substituted by pilot aided tone-by-tone channel estimation (CE): due to the average of subsequent orthogonal long training sequences (LTS), as in [32], each channel tap estimation ĥ r, t is affected by i.i.d.i.d
Under the assumption of (e.g., for a typical SFO value of around 50 ppm or 5E-5 in practice) and the use of the two identical long training sequences in the preamble of a burst, the coarse (initial) CFO and SFO estimates can be determined separately by (24).
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com