In existing systems, hidden terminal problem and exposed node problem also should be considered for energy detection, since the strength of received signal is various at transmitter side and receiver side.
As shown in Figure 5, the horizontal axis represents the distance and transmission delay between transmitter and receiver, and vertical axis represents the strength of received multicarrier interference synthesis signal at the same multicarrier transmitting signal power.
Meanwhile, the elected VCS will compare the pilot signal strength of received local lowest pilot signals from all LCs.
In our study, a Wi‐Fi fingerprint record includes BSSIDs (MAC address of APs), and RSSIs (signal strength of received Wi‐Fi signals) of the nearby APs.
where a1,and a3d areare the weight coefficients of the residual energy, the n b value, and the average signal strength of received BEACON messages, respectively.
Another common phenomenon in network communication is that the strength of received signals may vary over time, an effect also referred to as signal fading.
It can be seen that the strength of received signal gets attenuation with the square of distance or time delay as shown by the envelope curve, and the received signals suffer high wireless transmission attenuation in case of a certain of distance (delay) between transmitter and receiver.
It was found that the presence of graphene results in increased thermal and mechanical strength of received polymer films and contributes to the increase in hydrophobicity of generally hydrophilic coatings prepared from waterborne polyurethane cationomers [ 1].
Since SUs are located differently and strengths of received PU signals are different, it is shown in [51] that cooperation of all the SUs is not optimal.
Many radio chips that implement proprietary radio technologies provide the received signal strength indicator (RSSI), which is the strength of a received radiofrequency (RF) signal.
