Self-interference cancellation in underwater acoustic communications systems using orthogonal pilots in IBFD

This paper proposes a Self-interference (SI) cancellation system model of Underwater acoustic (UWA) communication for in-band full-duplex (IBFD) technology. The SI channel is separated from the Far by exploiting concurrently orthogonal pilot estimation technique using two frequency-division multiplexing (OFDM) blocks to establish orthogonality between them based on unitary matrix. Compared half-duplex estimator, mean squared error (MSE) and bit rate (BER) provided strong evidence efficiency proposed cancellation. Since systems are more efficient than ones, approach might be seen as viable option them. method proved effective when used with fixed (FD) position FD shifting up 4°. Different lengths distances adopted evaluate method. Initial findings indicate that MSE minimum mean-square (MMSE) estimator at 20 dB 0.118 · 10−3, FD. In addition, this presents geometry in IBFD underwater describes propagation delay multipath reflection. simulation results spread similar traditional results, suggested reaching (79 ms), which close Bellhop simulator result (78 ms).