tailieunhanh - Báo cáo hóa học: "A new low-complexity angular spread estimator in the presence of line-of-sight with angular distribution selection"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí sinh học đề tài :A new low-complexity angular spread estimator in the presence of line-of-sight with angular distribution selection | Bousnina et al. EURASIP Journal on Advances in Signal Processing 2011 2011 88 http content 2011 1 88 o EURASIP Journal on Advances in Signal Processing a SpringerOpen Journal RESEARCH Open Access A new low-complexity angular spread estimator in the presence of line-of-sight with angular distribution selection Inès Bousnina1 Alex Stéphenne2 3 Sofiene Affes2 and Abdelaziz Samet1 Abstract This article treats the problem of angular spread AS estimation at a base station of a macro-cellular system when a line-of-sight LOS is potentially present. The new low-complexity AS estimator first estimates the LOS component with a moment-based K-factor estimator. Then it uses a look-up table LUT approach to estimate the mean angle of arrival AoA and AS. Provided that the antenna geometry allows it the new algorithm can also benefit from a new procedure that selects the angular distribution of the received signal from a set of possible candidates. For this purpose a nonlinear antenna configuration is required. When the angular distribution is known any antenna structure could be used a priori hence we opt in this case for the simple uniform linear array ULA . We also compare the new estimator with other low-complexity estimators first with Spread Root-MUSIC after we extend its applicability to nonlinear antenna array structures then with a recently proposed two-stage algorithm. The new AS estimator is shown via simulations to exhibit lower estimation error for the mean AoA and AS estimation. Keywords angular spread mean angle of arrival angular distribution selection look-up table extended spread root-MUSIC I. Introduction Smart antennas will play a major role in future wireless communications. There exist several smart antenna techniques such as beamforming antenna diversity and spatial multiplexing. Future smart antennas will most likely switch from one technique to another according to the channel parameters 1 . One of the most important parameters is .

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