Gain control in a TDMA radio-telephone system
AssigneeNokia Mobile Phones Ltd.
InventorsHarri Honkasalo, Harri Jokinen, Seppo Lamberg
Life of this patent
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Abstract
In a radio-telephone system based on time-division multiple access, the AGC function of the receiver can be controlled so as to be approximating the actual value at the beginning of the reception timeslot. The field strength of a specific signal transmitted by a base station during a timeslot preceding a concerned reception timeslot is measured, the specific signal having a power the ratio of which to the power of the concerned signal is presumed. On the basis of this measured field strength and the presumed ratio, the required AGC gain of the AGC amplifiers is calculated and the AGC gain is set according to the calculated gain for the time of the concerned reception timeslot.
Claims9
A method for determining AGC gain of a radio-telephone receiver for a concerned reception timeslot in a mobile telephone system based on time division multiple access, in which a local base station transmits either continuously or at least at a given moment, a specific signal having a constant power and having the same frequency as a control signal employed by said local base station, the ratio of the power of said specific signal to the power of a signal in the concerned reception time slot is presumed, characterized in that
- during a timeslot preceding the concerned reception timeslot wherein said radio telephone receiver does not monitor transmissions of said control signal from said local base station, the field strength of the specific signal transmitted by the local base station is measured, and
- on the basis of the measured field strength and the presumed ratio, the required AGC gain is calculated and the AGC gain is set according to the calculated gain for the time of the concerned reception timeslot.
Dependencies are inferred from the claim text.