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Assuming that the antenna elements are closely located, and that p t) is narrowband, the transmitter becomes a bidimensional phased array, modeled as a SIMO system represented by a steering vector.
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The continuous complex Shannon wavelet transform is adopted to extract the frequency narrowband signals from the frequency wideband impact response signals of the PZT sensors.
Nevertheless, the use of civil communication signals, which are often narrowband signals, makes the detection and the classification difficult.
But they only apply to narrowband signals, because the steering vector of the received wideband signal model is time-variant.
The GAL narrowband ANC system can be used to overcome this problem [14, 15].
The main advantage of OFDM is that the narrowband of the subcarriers may be significantly increased in order to combat frequency-selective fading.
Compared to the narrowband case, the problem at hand is different due to the increase in degrees of freedom brought by OFDM or SCCP.
As for the narrowband analysis, the MoM-based tool ELSEM3D was used to determine the EM field along linear trajectories.
In the narrowband case, the vector snapshot can be modeled as [1, 19]: y = s + n = ρ v ν ¯ + n, (1).
Owing to the narrowband subcarriers, the CP in combination with channel coding, OFDM modulation techniques have led to very robust and reliable systems.
B is the bandwidth of the narrowband channel and the symbol * in Equation (6) stands for the conjugate transpose.
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