| 摘要 |
In a system having a transmitter and a receiver that communicate over a radio channel and in which signal transmission power of the transmitter is adjusted to compensate for fading dips in the channel, the Rayleigh fading rate of the radio channel, and thus the relative velocity between the transmitter and the receiver, are estimated by effectively observing the adjustments or fluctuations in signal transmission power or amplitude of the transmitter. In accordance with an exemplary embodiment of the invention, this is done by observing TPC (Transmission Power Control) commands that cause the transmitter to adjust its signal transmission power to combat Rayleigh fading, i.e., fading dips, in the radio channel. Since the TPC commands cause the transmitter to vary its signal transmission power to compensate for the fading dips, the fading dips and thus the fading rate and the relative velocity between the transmitter and the receiver can be determined by observing the signal transmission power fluctuations represented by the TPC commands. |
