System, method and apparatus for transmit diversity control based on variations in propagation path

Abstract

A method and apparatus for applications of identification of variations of propagation path to transmit diversity control. Transmit diversity parameters may be modified according to detected dynamics, which may, for example, be related to changes in actual propagation and network conditions. Such dynamics may be referred to as mobility parameters. Mobility parameters may apply to variability in a propagation path due to any conditions. Determination of a mobility parameter may be conducted using one or more of multiple parameters available to the mobile terminal. Such feedback information indication, which is related to the propagation path conditions, may be provided to the apparatus, which would attempt to find a more desired mode of operation, which may lead to reduction in power and the improvement of the quality of transmission.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation in part of U.S. patent application Ser. No. 11 / 712,569, entitled “Method, System and Apparatus for Estimation of Propagation Path Variability of a Transmit Diversity Channel” and filed Mar. 1, 2007, and also claims benefit of U.S. Provisional Patent Application Ser. No. 60 / 904,198, entitled “Applications of Identification of Variations in Propagation Path to Transmit Diversity Control” and filed Mar. 1, 2007, the entirety of all of which are incorporated by reference herein.FIELD OF THE INVENTION[0002]The present invention relates generally to the field of wireless communications, and more specifically to methods, systems and apparatus for transmit diversity control related to propagation path conditions.BACKGROUND OF THE INVENTION[0003]Wireless transmission systems may use transmit diversity, whereby signals are transmitted to a receiver using a plurality of transmit antennas. A receiving communication ...

AI Technical Summary

Benefits of technology

The present invention provides a solution for improving the performance of transmit diversity control in wireless communication systems. It addresses the problems associated with previous techniques by using a mobility parameter to determine the stability of the propagation path. The mobility parameter can be measured by analyzing the quality of the received signal or the power ratio of the transmitted signals. By adjusting the transmit diversity control algorithm based on the mobility parameter, the system can adapt to changing propagation conditions and provide better performance. The invention can be applied to both stationary and mobile terminals, and can improve the efficiency of the transmit diversity control, reduce interference, and improve transmission efficiency.

Problems solved by technology

The transmitted signals may propagate along different paths and may reach the receiving communication device with different phases that may destructively interfere.

The received signal quality may change at a receiver that may be attempting to detect a transmission from a mobile terminal, as well as a noise level created by a wireless terminal transmission in base stations attempting to detect signals from other wireless terminals.

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