公开(公告)号：EP2274885A1

公开(公告)日：2011-01-19

申请号：EP09726787.6

申请日：2009-03-09

申请人： QUALCOMM Incorporated

发明人： KADOUS, Tamer, A ,  YAO, Iwen ,  WANG, Jibing ,  JING, Weihong ,  LI, Yong

IPC分类号： H04L25/06

CPC分类号： H04L25/061 ,  H03G3/3068 ,  H03G3/3078

摘要： A technique for performing AGC and DC compensation in a receiver. The receiver comprises an energy estimator for generating an estimate of the level of a received signal; an RF device to apply gain to the received signal; an AGC for controlling the RF device gain based on the energy estimation; a first DC compensation loop for finely adjusting the DC component of the received signal in fast or slow tracking mode (FTM or STM); and a second DC compensation loop for coarsely adjusting the DC component of the received signal. Three modes of AGC operations: In Acquisition, iterations of FTM fine DC adjustment, short energy estimation, and RF device gain adjustment are performed during signal timing detection. In Connected, long energy estimation, RF device gain adjustment, and STM fine and coarse DC adjustments are performed during superframe preamble. In Sleep, FTM fine DC adjustment, short energy estimation, and RF device gain adjustment are performed during superframe preamble.