The drawbacks of [23] are as follows: (i) the solution based on the preambles is not very scalable due to the limited amount of available preambles and (ii) for a long-term view, the transmission of data in the control plane violate the principle of separation between the control plane and the data plane.
In this article, we describe CogMAC, a decentralized cognitive MAC protocol, which is based on the multichannel preamble reservation scheme.
The proposed identification methods are based on the extraction of the preamble RF fingerprint of a device and its comparison with a set of already known device RF fingerprints.
This algorithm is data aided based on the available IEEE 802.16 preamble in the transmission.
To inform eNB about the packet size of L2/L3 message, the preambles used for contention-based access are further divided into two subgroups based on the eNB allocation: random access preamble subgroups A and B. A UE, whose L2/L3 message size is larger than the parameter messageSize for group A, selects a preamble from subgroup B. Otherwise, it uses preambles from subgroup A [18].
In [8], the same authors develop a joint STO and CFO estimator for short nonperiodic preamble based on the ML principle.
Based on the estimation of the first preamble symbol, a coarse estimation of the CFO, which still suffers from intercarrier and intersymbol interference, can be obtained: ν ̂ = 1 2 π ∠ ∑ k ∈ K 2 b ~ k, 2 b ~ k, 0 ∗.
Many of his amendments, including his proposed new preamble, were based on the Virginia Declaration of Rights drafted by Anti-Federalist George Mason in 1776.
In accordance with the method we determined the interview purpose and collected sensitive issues by performing a brain storming with an interprofessional team (physician, nurse scientist, sociologist), applying the preamble oriented pyramid discussion based on the results of the review [ 12].
