Method and system for iterative downlink passive intermodulation spatial avoidance
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsPierre-Andre LAPORTE, Mark WYVILLE
Life of this patent
Estimating the term…
Abstract
A method, network node and wireless transceiver, for implementing iterative downlink passive intermodulation (PIM) spatial avoidance algorithms are provided. According to one aspect, a method in a wireless transceiver includes determining an uplink signal power. The method also includes determining an estimate of a downlink PIM subspace that minimizes a cost function that depends on the uplink signal power and a previous estimate of the downlink PIM subspace. The method further includes applying a correction to a downlink antenna signal to reduce the PIM, the correction being based at least in part on the estimate of the downlink PIM subspace
Claims24
A method for reducing passive intermodulation, PIM, in a wireless transceiver from a preexisting extent of PIM, the method comprising:
- determining an uplink signal power;
- determining an estimate of a downlink PIM subspace that minimizes a cost function that depends on the uplink signal power and a previous estimate of the downlink PIM subspace;
- and
- applying a correction to a downlink antenna signal to reduce the PIM, the correction being based at least in part on the estimate of the downlink PIM subspace.
A wireless transceiver configured to reduce passive intermodulation, PIM, from a preexisting extent of PIM, the wireless transceiver comprising processing circuitry configured to:
- determine an uplink signal power;
- determine an estimate of a downlink PIM subspace that minimizes a cost function that depends on the uplink signal power and a previous estimate of the downlink PIM subspace;
- and
- apply a correction to a downlink antenna signal to reduce the PIM, the correction being based at least in part on the estimate of the downlink PIM subspace.
A network node configured to reduce passive intermodulation, PIM, from a preexisting extent of PIM affecting performance of at least one wireless transceiver of the network node, the network node comprising:
- at least one wireless transceiver configured to:
- receive an uplink signal vector at a first frequency;
- and
- transmit a downlink signal vector at a second frequency;
- and
- processing circuitry in communication with the at least one wireless transceiver, the processing circuit configured to:
- determine an uplink signal power based on the uplink signal vector;
- determine an estimate of a downlink PIM subspace that minimizes a function of:
- the downlink signal vector, a previous estimate of the downlink PIM subspace and the uplink signal power;
- and
- apply a correction to a downlink antenna signal to obtain the downlink signal vector, the downlink signal vector resulting in PIM that is less than a preexisting extent of PIM, the correction being based at least in part on the estimate of the downlink PIM subspace.
A method in a network node configured to reduce passive intermodulation, PIM, from a preexisting extent of PIM affecting performance of at least one wireless transceiver of the network node, the method comprising:
- receiving an uplink signal vector at a first frequency;
- transmitting a downlink signal vector at a second frequency;
- determining an uplink signal power based on the uplink signal vector;
- determining an estimate of a downlink PIM subspace that minimizes a function of:
- the downlink signal vector, a previous estimate of the downlink PIM subspace and the uplink signal power;
- and
- applying a correction to a downlink antenna signal to obtain the downlink signal vector, the downlink signal vector resulting in PIM that is less than a preexisting extent of PIM, the correction being based at least in part on the estimate of the downlink PIM subspace.
Dependencies are inferred from the claim text.