Figure 6 | Scientific Reports

Figure 6

From: Realization of multiple orbital angular momentum modes simultaneously through four-dimensional antenna arrays

Figure 6

Scenario of demodulating the OAM-carrying signals. On the transmitting side, there are two binary phase shift keying (BPSK) signals carrying the −2nd OAM mode and the +1st OAM mode respectively. The signals operate at the frequency of 2.6 GHz and have a bit rate of Rb = 16 Mbps. The OAM-carrying BPSK signals are received and modulated by a 4-D circular antenna array, and a digital band-pass filter with a bandwidth of B = 0.5f p is used to demodulate the BPSK signal. The power of the additive white Gaussian noise (AWGN) for different directions is set to be the same, while the power of the received signal corresponds to the radiation pattern.

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