| 摘要 |
<p>A system and method for optimizing the power level in the upstream direction in an ADSL communication system are disclosed. The system and method optimize the upstream signal power level by determining at least one system parameter related to the transmission of the input communications signal and modifying the bit and gain tables in response to the system parameter to optimize the upstream power level. More specifically, in one embodiment, the present invention selects a maximum received power configuration parameter for a receiving device, measures the received signal power at the receiving device, determinines a power backoff parameter for the transmitting device, uses the power backoff to modify the bit and gain tables and communicates the modified bit and gain tables to the transmitting device. In another embodiment, the present invention estimates the SNR loss resulting from a decrease in the upstream signal power level by distinguishing between noise sources whose power scales with the input signal received by the first transceiver (Np) and noise sources that remain constant with received signal power changes (Nc). The present invention then determines S'/N' = aS/(aNp + Nc), where S' = aS, the reduced signal level, and N'= the noise present with the reduced signal level.</p> |
