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Figure 9 shows the BER performance of a conventional noniterative receiver, that is, one time equalization and channel decoding for three different values of SNR and different length of feedback filter.
Data were averaged according to the specific task condition (2-back, 1-back) channel-wise for each participant, yielding one time segment for each channel and condition (these pre-processing steps are in accordance with the procedure outlined by Reif et al. (2011)).
The RFID channel contains a downlink channel and an uplink channel at one time.
In optimal OSA approach, we consider that the secondary user at most accesses the channel one time in an idle period.
However, since there are only 12 OFDMA segments, as per observations from our simulation setup, one segment may be used by more than one user at the same time (channel reuse) if the users are separated by enough distance.
In an initialization phase, vehicles listen to wireless channel and store channel activities during one time frame (e.g., the occupation of each slot and a position of the slot owner).
However, we cannot select the best angular-Doppler channels at one time, for the reason that there are so many combinations of auxiliary channels which are used to compose the RD matrix T. Therefore, we select the best channels step by step.
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However, the receiver follows the jump pattern for T−1 time slots and then stays in the same channel for one time slot before the new jump period.
