11.1 Doppler Measurement and Compensation in Mobile Satellite Communications Systems

Radio environment map-based cognitive Doppler spread compensation algorithms for high-speed rail broadband mobile communications

Recently, there is an increasing yet challenging demand on broadband mobile communications for high-speed trains. In this article, cognitive Doppler spread compensation algorithms are proposed for high-speed rail broadband mobile communications, which make use of the dedicated radio environment map (REM) for railway to compensate the time-varying Doppler spread. The dedicated REM for high-speed...

Performance of Pilot Carrier Based Doppler Compensation for Cdma Land Mobile Satellite Links

The performance of a Doppler estimation scheme for CDMA land mobile satellite systems under realistic channel conditions is studied by computer simulation. The scheme can be applied in Doppler compensation of the received signals, to aid in the code acquisition under the severe Doppler conditions offered by the satellite channel. The proposed scheme is based on a continuous-wave pilot carrier p...

Rain Attenuation and Doppler Shift Compensation for Satellite Communications

Sooyoung Kim Shin et al. 31 In high-speed multimedia satellite communication systems, it is essential to provide high-quality, economical services by using efficient transmission schemes which can overcome channel impairments appearing in the satellite link. This paper introduces techniques to compensate for rain attenuation and the Doppler shift in the satellite communication link. An adaptive...

A Fade-Compensation Technique for Digital Land Mobile Satellite Systems

Performance of Multi-Carrier CDMA with Iterative Detection for a Doppler Shift Channel in a LEO Mobile-Satellite Communications Environment

In this paper we consider a matrix algebraic approach to derive the coded Multi-Carrier CDMA (MC-CDMA) system model for a Doppler shift channel. We derive the eeects of Doppler shift in a MC-CDMA system for low earth orbit (LEO) mobile-satellite communications and show the similarity of a MC-CDMA channel model under Doppler shift with that of the asynchronous DS-CDMA channel model. We therefore...