Impact of inter-mode interference on BER performance of orbital angular momentum based radio communications

In this paper, the impact of inter-mode interference on performance of orbital angular momentum (OAM) based communications are investigated in terms of bit error rate (BER). When inter-mode interference occurs, it is shown that BER is bounded as the transmit signal-to-noise-ratio (SNR) increases. When an interference suppression scheme such as zero forcing is used, however, BER performance improved significantly; the BER reduces proportionally as the transmit SNR increases.