Fast AGC for TDMA radio systems
US5493712A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 23, 1994 |
| Grant date | Feb 20, 1996 |
| Priority date | — |
| Expiry date | Mar 23, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/3047
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Disclosed is a circuit for automatic gain control (AGC) of random access channels (RACH) and traffic channels in a radio system. The amplitude of the input signal is detected at an intermediate frequency (IF) stage, digitized, and coupled to a digital signal processor (DSP) which produces an AGC signal for reducing the gain of the input when the input crosses a threshold value. For RACH bursts, the AGC signal tracks the input signal when it crosses the threshold and the AGC signal remains at a constant value for the the remainder of the time slot unless and until the input increases a threshold amount over its previous highest value. For traffic channels, the DSP will use the AGC signal from the RACH burst as an initial value and change the AGC signal only if the detected input is outside a predetermined range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.