Determination of a reference value for automatic gain control of a receiver communicating with a packet switched communication network
AssigneeNokia Corporation
InventorJari Ruohonen
Life of this patent
Estimating the term…
Abstract
A device and a method for determining a reference level for automatic gain control of a radio frequency signal to be received, particularly having a varying strength, in which method radio blocks are received on a logical general packet data traffic channel of a signal, which radio blocks have been transmitted with a predetermined transmission power level and by using a predetermined way of controlling the transmission power level. In the invention, said reference level is continuously determined on the basis of correctly received or valid radio blocks, wherein the reference level is corrected on the basis of the signal strength measured during the reception of each valid radio block.
Claims38
A method in a receiver for determining a reference level for automatic gain control of the receiver for a radio frequency signal to be received, the signal having a varying signal strength, said method comprising:
- receiving radio blocks in said receiver on a logical packet data traffic channel of the signal, which radio blocks have been transmitted with a predetermined transmission power and by using a predetermined way of controlling the transmission power,
- determining continuously said reference level on the basis of correctly received valid radio blocks of the logical packet data traffic channel, and
- correcting said reference level on the basis of the signal strength measured during the reception of each valid radio block.
A device in a receiver for determining a reference level for automatic gain control of the receiver for a radio frequency signal to be received, the signal having a varying signal strength, said device comprising:
- a circuit for receiving in said receiver, on a logical packet data traffic channel of the signal, radio blocks which have been transmitted with a predetermined transmission power and by using a predetermined way of controlling the transmission power,
- a circuit for continuous determination of said reference level on the basis of correctly received valid radio blocks of the logical packet data traffic channel, wherein said circuit configured to correct said reference level on the basis of the signal strength measured during the reception of each valid radio block.
A method for determining a reference level for automatic gain control of a radio frequency signal to be received, the signal having a varying signal strength, said method comprising:
- receiving radio blocks on a logical packet data traffic channel of the signal, which radio blocks have been transmitted with a predetermined transmission power and by using a predetermined way of controlling the transmission power,
- determining continuously said reference level on the basis of correctly received valid radio blocks of the logical packet data traffic channel, and
- correcting said reference level on the basis of the signal strength measured during the reception of each valid radio block;
- receiving a signal of a broadcasting channel which signal of the broadcasting channel has been transmitted at a predetermined constant transmission power, and
- correcting the reference level on the basis of a signal strength of the broadcasting channel measured during the reception of the signal of the broadcasting channel, if the valid radio block has not been received during a predetermined period of time,
- wherein said predetermined period of time is a period comprising 18 successive radio blocks in the GPRS network.
A method for determining a reference level for automatic gain control of a radio frequency signal to be received, the signal having a varying signal strength, said method comprising:
- receiving radio blocks on a logical packet data traffic channel of the signal, which radio blocks have been transmitted with a predetermined transmission power and by using a predetermined way of controlling the transmission power,
- determining continuously said reference level on the basis of correctly received valid radio blocks of the logical packet data traffic channel,
- correcting said reference level on the basis of the signal strength measured during the reception of each valid radio block;
- and
- correcting the reference level on the basis of the maximum signal strength measured from incorrectly received radio blocks, if, within a predetermined period of time, no valid radio blocks have been received during the maximum interval of occurrence of reference blocks.
A method for determining a reference level for automatic gain control of a radio frequency signal to be received, the signal having a varying signal strength, said method comprising:
- receiving radio blocks on a logical packet data traffic channel of the signal, which radio blocks have been transmitted with a predetermined transmission power and by using a predetermined way of controlling the transmission power,
- determining continuously said reference level on the basis of correctly received valid radio blocks of the logical packet data traffic channel,
- correcting said reference level on the basis of the signal strength measured during the reception of each valid radio block;
- and
- correcting the reference level by a predetermined value, when clipping has occurred in the reception of the valid radio block when the signal strength is below a set maximum limit or above a set maximum limit.
A method for determining a reference level for automatic gain control of a radio frequency signal to be received, the signal having a varying signal strength, said method comprising:
- receiving radio blocks on a logical packet data traffic channel of the signal, which radio blocks have been transmitted with a predetermined transmission power and by using a predetermined way of controlling the transmission power,
- determining continuously said reference level on the basis of correctly received valid radio blocks of the logical packet data traffic channel,
- correcting said reference level on the basis of the signal strength measured during the reception of each valid radio block;
- receiving radio blocks on two or more logical packet data traffic channels, which radio blocks have been transmitted at a predetermined transmission power and by using a predetermined method of transmission power control, and
- determining continuously said reference level on the basis of valid radio blocks and for each of said logical packet data traffic channels.
A method for determining a reference level for automatic gain control of a radio frequency signal to be received, the signal having a varying signal strength, said method comprising:
- receiving radio blocks on a logical packet data traffic channel of the signal, which radio blocks have been transmitted with a predetermined transmission power and by using a predetermined way of controlling the transmission power,
- determining continuously said reference level on the basis of correctly received valid radio blocks of the logical packet data traffic channel,
- correcting said reference level on the basis of the signal strength measured during the reception of each valid radio block;
- and
- selecting, for the determination, such valid radio blocks which are received at intervals of a predetermined period, for synchronization of the receiver and a communication network,
- wherein said predetermined period of time is a period comprising 18 successive radio blocks in the GPRS network.
Dependencies are inferred from the claim text.