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Exact(60)
Per information processing theory, attention is a limited resource.
The NACK packets can also be used to extract the current PER information of the corresponding hop.
Whenever an intermediate node receives NACK packet from its successor node, it will be able to update the PER information of the corresponding hop.
Here, we assume that the source node N 0 has already acquired the initial PER information corresponding to its link to Node N 1 (i.e., hop 1).
Updating the PER information with the help of NACK packets can reduce the total number of retransmissions in the network and hence the proposed scheme is more adaptable to the dynamic characteristics of the underwater acoustic channel.
The time window over which the average of PER is calculated is limited to 300 s, to follow the actual network state, i.e., any 300 s (any 60 receptions of the HELLO packetb) the PER information is reset.
However, one major problem with this approach is that the number of lost packets in one transmission trial could be a random variable and hence current PER information cannot be considered for the accurate computation of the redundancy for the next block of data.
Figure 8 DQ-MAC energy consumption per information bit: Analytical versus Simulation.
Here, E b denotes the average energy per information bit arriving at the receiver.
Thus, the overall complexity per information bit of the forward and backward filter is.
The number of sums per information bit is equal to TC M).
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