Real-time transceiver gain and path loss calibration for wireless systems

A calibration method using a plurality of mobile unit that each have a transceiver, the method comprising:

• each transceiver performing a loop back test to determine relationships between transmitter and receiver power levels of each transceiver;
• computing path loss between a pair of transceivers, wherein computing path loss includes each transceiver transmitting a signal to another transceiver;
• determining the receive path gain for each transceiver based on the computed path loss and the power level of a signal received by said each transceiver and transmitted by another transceiver using a predetermined transmit power level;
• and
• determining the transmit path gains and another receive path gain based on the first receive path gain.

An apparatus comprising:

• means in each of a pair of transceivers for performing a loop back text to determine a relationship between transmit and receive gain for each transceiver;
• and
• means for computing a path loss between the first transceiver and a second transceiver by transmitting a pair of signals in opposite directions between the first and second transceivers to determine a relationship between transmit path gain of the first transceiver and receive path gain of the second transceiver and a relationship between the transmit path gain of the second transceiver and receive path of the first transceiver;
• and
• means for generating transmit and receive path gains for the first transceivers based on the path loss and the relationships.

A mobile device having a first transceiver the device comprising:

• an Rf front end;
• a processing unit coupled to the RF front end, the processing circuit performing gain and power level calibration by:
• performing a loop back test to determine a relationship between transmit and receive gain for each transceiver;
• and
• computing a path loss between the first transceiver and a second transceiver, wherein computing the loss comprises transmitting a pair of signals in opposite directions between the first and second transceivers to determine a relationship between transmit path gain of the first transceiver and receive path gain of the second transceiver and a relationship between the transmit path gain of the second transceiver and receive path of the first transceiver;
• and
• generating transmit and receive path gains for the first transceivers based on the path loss and the relationship using a fixed power level.