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Beamforming Technique for Improving Physical Layer Security in an MIMO-OFDM Wireless Channel

2023; Springer International Publishing; Linguagem: Inglês

10.1007/978-981-99-1203-2_11

2367-3370

Somayeh Komeylian, Christopher Paolini, Mahasweta Sarkar,

Cooperative Communication and Network Coding

The open nature of the wireless medium leads to the growing technical literature on solutions and techniques for increasing the privacy and security of a wireless communication channel. This work focuses on implementing the beamforming technique incorporated with a combination of MIMO-OFDM techniques for increasing physical layer security in the downlink of a wireless communication channel. The rectangular antenna array has been employed at the Tx side of an MIMO-OFDM channel with two orthogonal polarizations. This results in an improvement in the downlink performance due to a reduction in a duration of the channel sounding procedure compared to its uplink counterpart. We have used the WINNER II module from MathWorks’ MATLAB to simulate a realistic wiretap channel including Alice (to represent a sender), Bobs (to represent users), and Eve (to represent the information leakage). We have numerically estimated the success rate of Eve and physical layer security with performing a beamforming technique, compared to the available techniques without any beamforming technique, in an MIMO-OFDM wireless channel. Although physical layer security is affected by power, we have demonstrated that the beamforming technique with the technique of assigning subcarriers for Bobs can significantly improve the physical layer security and thereby overcome information leakage in the wiretap channel.