发明名称 |
DIGITAL AUTOMATIC GAIN CONTROL |
摘要 |
There is provided a method of digital Automatic Gain Control (AGC) in areceiver having limited dynamic range, particularly for discontinuous signals. The method comprises detecting the level of a received and AGC'd discontinuous signal, comparing the level of the AGC'd signal relative to the dynamic range of the receiver, and adjusting the AGC to establish a desired relationship between the AGC'd signal and the dynamic range limitation. There is also provided a method of handoff in a TDMA cellular-type transmission system utilizing this method of AGC. The method for Automatic Gain Control (AGC) of discontinuous signals in a receiver having limited dynamic range is further characterized by: digitizing a received and AGC'd discontinuous signal and converting the digitized samples to a power sample to sense the power of and detect the level of the signal, comparing the level of the AGC'd signal relative to the dynamic range of the receiver; and coarsely-adjusting by either progressively attenuating the signal until it falls within the dynamic range of the receiver or by progressively gain-amplifying the signal until it falls within the limited dynamic range of the receiver and finely-adjusting the AGC of the received signal until optimum use of the full (albeit limited) dynamic range of the signal processing stages is about 6-12 dB below maximum sensitivity to establish a desired relationship between the AGC'd signal and the dynamic range limitation.
|
申请公布号 |
CA2000785(C) |
申请公布日期 |
1994.10.25 |
申请号 |
CA19892000785 |
申请日期 |
1989.10.16 |
申请人 |
MOTOROLA, INC. |
发明人 |
KEPLER, JAMES F. M.;BORTH, DAVID E.;CERNY, FRANK J., JR. |
分类号 |
H03G3/20;H04B3/06;H04B7/005;H04L27/18;H04L27/22;(IPC1-7):H04J3/02;H04B7/26;H04B1/40 |
主分类号 |
H03G3/20 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|