Exact(3)
Typically, the SU operates spectrum sensing frame by frame, and each frame is divided into two parts: the sensing duration and the data duration [3 5].
After this step, the autocorrelation test determines the duration of the cyclic prefix, which as a result also gives us the data duration in an OFDM symbol.
The SU detects whether the licensed spectrum is accessed within the sensing duration, and then transmits data within the data duration if the sensing result is OFF (which identifies that the PU's state is OFF); otherwise, the SU keeps silent.
Similar(57)
Suppose the time length of cyclic prefix is and the useful data duration is.
To assess severity of illness the clinical data (duration and frequency of diarrhoea and vomiting and the presence of fever and dehydration) were determined.
The major difficulty with this approach is that the duration between two successive sex acts is a closed interval, while the available data – duration since last intercourse – is an open interval.
The demographic data, duration of intubation time and procedure time were similar in both groups.
The data sampling duration T was set to 10 s.
The data symbol duration is set as 10 ns.
Nonetheless, the data call duration is state dependent with varying active users.
Therefore, the maximal area throughput is achieved as a trade-off between the EH amount and the data transmission duration.
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