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The TSU has three functions: energy detection, transmit training sequence and transmit signal.
From timeslot until timeslot, the relays transmit training sequences to the destinations.
Traditional packet based systems transmit training data which the receiver can use to estimate (H s ).
Hence, the eavesdropper is able to cooperatively transmit training signal to all relays.
In practical WSNs, the FC usually has no CSI, and the sensors can transmit training symbols to facilitate channel estimation.
The system can transmit training sequence including both bits 0 and 1, and the training sequence is known by both transmitter and receiver.
Similar(53)
Therefore, they can be powered down while either processing conventional data frames or transmitting training frames.
Moreover, the same set of subcarriers are used for transmitting training symbols across all the antennas.
If the channel is static during CFO estimation, periodically transmitted training symbols lead to periodical and at the receiver.
As the target node moves on, it periodically transmits training sequences and seeks assistance from those selected peer nodes.
At the beginning (t = 0), the target mobile node transmits training sequence at its highest transmit power and seeks for assistance from all reachable peer nodes.
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