초록 ▼

The present invention provides accurate, unbiased adaptive gain control in high speed digital communications systems. The probability of receiving each of a plurality of symbols to be transmitted over a data communications channel is determined for the predetermined communications protocol used over

The present invention provides accurate, unbiased adaptive gain control in high speed digital communications systems. The probability of receiving each of a plurality of symbols to be transmitted over a data communications channel is determined for the predetermined communications protocol used over that data communications channel. Based on the probability determined for each symbol, an adaptive gain control adjustment factor is established for each symbol. During active communications, symbols transmitted over the data communications channel are detected, and the adaptive gain control value is selectively adjusted using an adjustment factor established for the detected symbol. Accordingly, adaptive gain control updating in accordance with one embodiment of the invention employs different step sizes for incrementing and decrementing the adaptive gain control value depending on the magnitude of the symbol received.

대표청구항 ▼

[ What is claimed is:] [18.] In a digital data communications system including a transceiver that transceives symbols transmitted over a communications channel, a method comprising the steps of:determining for a predetermined digital communications protocol where a first symbol or series of symbols

[ What is claimed is:] [18.] In a digital data communications system including a transceiver that transceives symbols transmitted over a communications channel, a method comprising the steps of:determining for a predetermined digital communications protocol where a first symbol or series of symbols is predictably received more frequently than a second symbol or series of symbols, an error in adjusting a gain value applied to received first and second symbols;determining a variable adjustment factor that compensates for the error; andadjusting a gain applied to received symbols using the variable adjustment factor.