Multipath-channel estimation and application to ionospheric channels

作者：Sanz Gonzalez Jose L^*; Zazo Santiago; Perez Alvarez Ivan A; Lopez Perez Javier

来源：Wireless Networks, 2011, 17(6): 1461-1473.

DOI：10.1007/s11276-011-0358-3

• Linear time-variant systems
• Multipath channels
• Ionospheric channels
• Path delay
• Doppler spread
• Fading channels
• Gaussian spectrum

In this paper, the theory of linear time-variant systems is applied to multipath channels and, in particular, to ionospheric channels. Some useful formulas in time and frequency domains are given for both deterministic and random linear time-variant systems and multipath channels. The fundamental parameters of a multipath channel are the delay and the gain coefficient of each path, and the number of significant paths. We propose a methodology for estimating path-delays and path-coefficients and its application to the ionospheric channel estimation. Also, if path coefficients are stationary random processes, the power spectral density of the coefficients can be estimated from measured data of real (actual) channels. Finally, exhaustive computer simulations have been realized for testing the algorithms and a sample of the results is provided in the paper; also, estimation results for an actual narrowband HF ionospheric channel are provided, where up to four significant paths (rays) are detected with a Doppler spread lower than 0.2 Hz.

• 出版日期2011-8