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Each packet has two pilot symbols followed by several data symbols.
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This is demonstrated in Fig. 7 which shows the PSDs of several arbitrarily selected modulated data symbols in SP-OFDM and PMix-OFDM.
One frame is composed of a short preamble, a long preamble, a header symbol, and several data symbols[19], as shown in Figure2.
In this scheme, data symbols are spread over several subcarriers by DFT, and this is followed by ordinary OFDM processing.
Without loss of generality, we concentrate on a single L-length data block, although in practical system several data blocks are mapped into the OFDM symbol.
Thereafter, data symbols follow.
First, it rotates data symbols.
The power of pilot symbols and data symbols are equal.
Fourth symbol in each slot is a pilot symbol, and the rest is data symbols.
Each frame contains Kp = 5 pilot symbols and K = 200 data symbols (including four termination symbols).
The transmitted data symbols are real-valued.
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