Patent ID: 6263030
Filing Date: 2001-07-17
Classification: H04L

Abstract:
In a mobile communication device for use in a mobile radio communication system, an equalizer compensating for changing channel conditions caused by movement of the mobile communication device at varying speeds, said equalizer comprising:an estimator receiving a digital signal transmitted over a communication channel, the digital signal being adversely modified by fading during transmission caused by movement of the mobile communication device at varying speeds, and a channel estimate signal, the estimator responsively producing a decision signal representing an approximation of the transmitted digital signal with fading eliminated;a first channel tracker tuned to a first speed of the mobile communication device and receiving the decision signal;a second channel tracker tuned to a second speed of the mobile communication device, different from the first speed, and receiving the decision signal; anda decision circuit receiving the decision signal and responsively selecting one of the first and second channel trackers to produce the channel estimate signal.