| 摘要 |
The apparatus of the present invention for signal amplitude restoration, having a received signal input (140) and a scaled received signal output (150), includes an amplitude correction factor generator (120) which has an estimated signal-to-noise power ratio input (150) and a received signal input (140); a variable gain amplifier (130) which uses the correction factor generator output to control its gain, and which amplifies or attenuates the received signal input to provide the scaled received signal output; and an average SNR estimator (110) which uses the amplifier output as its input, and provides an output connected to the estimated signal-to-noise power ratio input. The apparatus operates to process received signals in an iterative fashion, such that at least one of the outputs is stored for use as a feedback input during later iterations. The method of the present invention for providing a level-restored received signal output comprises the steps of providing a correction factor (120) output to the gain control of a variable gain amplifier (130) (connected to the received signal input), and providing an average signal-to-noise ratio (SNR) estimate (110) using the level-restored received signal output and a stored running weighted average from a previous iteration of the method (150) for feedback to a correction factor generator (120) (which provides the correction factor output). The resulting average SNR estimate is stored (300) as a new running weighted average for use in subsequent iterations of the method. |
