Advanced OFDM-Based Wideband Transmission and Direction- Finding for Wearable Devices in Rician Channels

Abstract

Abstract This paper proposes a new technique for wideband transmission and direction-finding using orthogonal frequency division multiplexing (OFDM) for wearable devices in noisy Rician channels. The technique uses a coded OFDM signal combined with a pseudo-random permutation and a Walsh sequence to mitigate inter-carrier interference, peak-to-average power ratio, and frequency offset. The technique also inserts a pilot symbol into each OFDM block and uses it for frequency offset estimation, channel estimation, message detection, and angle of arrival estimation. The technique employs a delay discrimination algorithm to extract the first arriving impulse from each antenna channel and then applies a direction-finding algorithm to estimate the angle of arrival. The technique is evaluated through rigorous simulations using MATLAB. It shows superior performance and reliability compared to existing methods in terms of signal-to-noise ratio, bit error rate, and angle error.