This paper treats pilot aided multi-path channel estimation with tracking loops for OFDM systems under slow to moderate fading conditions. Recent works have presented theoretical results for the tuning of second-order and thirdorder tracking loops in the particular context of Jakes’s Doppler spectrum channel. The method for getting the loop coefficients resorted either to the use of a given con...

A design is described for a transmitter/receiver system that may be used in a spaceborne laser heterodyne tracking system to produce a high-precision interferometer. We present a two-color laser scheme that enables accurate phase measurement even in the presence of a large Doppler offset between the incoming and outgoing signals. The beat note between the two lasers provides a built-in frequenc...

Abstract. The Lorentz covariant theory of precise Doppler measurements (PDM) based on the retarded Liénard-Wiechert solution of the Einstein equations is described. An exact solution of equations of light propagation in the field of arbitrary moving bodies, which drastically extends the range of applicability of the new theory of PDM, is obtained. An explicit formula for the gravitational shift...

In this work, we investigate the use of backscattered mm-wave radio signals for joint tracking and recognition identities humans as they move within indoor environments. We build a system that effectively works with multiple persons concurrently sharing freely moving same space. This leads to complicated setting, which requires one deal randomness complexity resulting (composite) signal. The pr...