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I don't think that many saw Windows 8.1 with Bing as a full preamble of Microsoft's Windows 10 strategy, but here we are.
The other distribution, which also uses M=64 subcarriers, adopts a full preamble of pilot tones of length T=4, followed by N−T=50 data symbols.
The results have shown the significant improvement that the proposed method offers in both transmission modes, i.e., as scattered pilots in data and as a full preamble of pilot tones followed by the data.
During the second phase, the source and the relay send a new two-symbol full preamble of the above structure, using this time x2(p) and xR(p) (in the first FBMC symbol).
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For preamble-based channel estimation, the transmitter sends either a sparse or a full preamble at the beginning of a frame, to assist the receiver in estimating the channel.
It is the presence of these interfering terms in a full preamble that, with an appropriate choice of the x p,0)'s, can increase (preferably maximize) the energy of the b p,0)'s and permit significant gains in estimation performance over both the FBMC/OQAM sparse preamble and the CP-OFDM full preamble.
Due to the interference effect not being negligible in this scenario of a full preamble, these are in general different from the energies at the SFB input (see also [14, 15]).
Figure 8 The full preamble case assuming invariant neighboring CFRs (channels of large coherence bandwidth).
M=64, K=3. Figure 9 The full preamble case assuming invariant neighboring CFRs (channels of large coherence bandwidth).
The FBMC/OQAM modulation system and the cooperative communications system employed here are described in Section 2. The problems of (a) sparse and (b) full preamble design are addressed in Sections 3 and 4, respectively.
It is thus of interest to also investigate the full preamble case where the situation is quite different and more challenging.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com