Mean angle of arrival, angular and Doppler spreads estimation in multiple‐input multiple‐output system

Abstract

In this paper, the authors propose a new method to simultaneously estimate the mean angle of arrival (AoA), the angular spread (AS) and the maximum Doppler spread (DS). They exploit the multiple-input multiple-output (MIMO) Rayleigh channel with uniform linear arrays at both the transmitter and the receiver. They also consider the Gaussian and the Laplacian angular distributions for the incoming AoAs. The proposed method uses the first and the second derivatives of the received signals cross-correlation functions. They take as benchmarks two estimators from the literature for the three parameters estimates. The spread root multiple signal classification (MUSIC) (SRM) estimator is used for the mean AoA and the AS parameters, whereas the auto-correlation function (ACF)-based approach is considered for the maximum DS estimates. These methods were developed for single-input multiple-output and singleinput single-output systems. In this paper, the authors extend these algorithms to a MIMO configuration. Simulation results show that their algorithm outperforms the SRM one for the mean AoA and the AS estimation. For the maximum DS estimation, their approach offers lower error rate than the ACF-based one when the AS and the mean AoA are small. For higher values of the couple AS and mean AoA, their algorithm presents similar results.

Elevation and azimuth-aided channel estimation scheme for airborne hyperspectral data transmission

“…In order to be able to construct the frequency domain channel matrix for data demodulation, all the channel parameters, i.e., complex amplitude, Doppler shift, angle of departure (AoD), and angle of arrival (AoA), of the channel taps should be estimated. Several papers have considered the joint estimation of the channel parameters; 6,[7][8][9][10][11][12][13][14][15][16] however, no paper has considered the joint estimation of all the channel parameters in DS MIMO-OFDM channels. Those papers can be categorized into two groups regarding the problem that they considered.…”

“…The first group of those papers [6][7][8][9][10][11][12][13][14] deals with the complex amplitude, AoD, and AoA estimation by the assumption that the channel is not DS, i.e., zero Doppler shift or very low Doppler shift. The second group of papers 15,16 deals with the radar systems, and therefore, they do not consider the complex amplitudes' estimation.…”