Multi-antenna receive diversity control in wireless communications

A wireless apparatus, comprising:

• a primary receiver;
• a second receiver, the second receiver adapted for multiple-antenna receive diversity in the wireless apparatus;
• a diversity controller coupled to the second receiver and adapted to enable and disable the second receiver, the diversity controller comprising:
• a first estimator for estimating a parameter of the wireless apparatus;
• a second estimator for estimating parameter of a network;
• and
• control means for enabling the second receiver as a function of the estimated parameters,
• wherein the diversity control unit is further adapted to:
• estimate a ratio of energy-of-traffic to energy-of-pilot;
• multiply the ratio by a number of sectors in soft handoff to generate an adjusted ratio;
• filter the adjusted ratio using a first time constant to generate a numerator;
• filter the number of sectors in soft handoff using a second time constant to generate a denominator;
• and
• generate an indicator dividing the numerator by the denominator;
• and
• use the indicator to control the second receiver.

A wireless apparatus, comprising:

• primary receiver means;
• secondary receiver means, the secondary receiver means adapted for multiple-antenna receive diversity in the wireless apparatus;
• diversity controller means coupled to the secondary receiver means and comprising means for enabling and disabling the secondary receiver means, the diversity controller means comprising:
• means for estimating a capacity usage of the wireless apparatus;
• means for estimating a load on network capacity;
• and
• means for enabling the secondary receiver means as a function of the estimated capacity usage of the wireless apparatus and the estimated load on network capacity,
• wherein the estimated capacity usage of the wireless apparatus is given as ECT/IOR, wherein IOR represents the total energy per chip of all channels transmitting from a transmitter in the network, and ECT represents energy per chip of a traffic channel,
• wherein the estimated load on network capacity is given as IOR/ECP, wherein IOR represents the total energy per chip for all channels transmitting from the transmitter in the network and ECP represents energy per chip of a pilot signal, and
• wherein the control means includes means for calculating a capacity estimate as:
• CapacityEstimate=IOR/ECP+ECT/IOR;
• and
• wherein enabling the secondary receiver means is a function of the capacity estimate.

A wireless apparatus, comprising:

• primary receiver means;
• secondary receiver means, the secondary receiver means adapted for multiple-antenna receive diversity in the wireless apparatus;
• diversity controller means coupled to the secondary receiver means and including means for enabling and disabling the secondary receiver means, the diversity controller means comprising:
• means for estimating a parameter of the wireless apparatus;
• means for estimating a parameter of the network;
• means for enabling the secondary receiver means as a function of the estimated parameters;
• means for estimating a ratio of energy-of-traffic to energy-of-pilot;
• means for multiplying the ratio by a number of sectors in soft handoff to generate an adjusted ratio;
• means for filtering the adjusted ratio using a first time constant to generate a numerator;
• means for filtering the number of sectors in soft handoff using a second time constant to generate a denominator;
• and
• means for generating an indicator dividing the numerator by the denominator;
• and
• means for using the indicator to control the secondary receiver means.

The wireless apparatus as in 21, wherein:

• the means for estimating the parameter of the wireless apparatus includes means for estimating an energy-of-traffic;
• the means for estimating the parameter of the network includes means for estimating an energy-of-pilot;
• and
• the means for enabling the secondary receiver means includes means for enabling the secondary receiver means as a function of a ratio of the estimated energy-of-traffic to the estimated energy-of-pilot.

A method comprising:

• estimating a capacity usage of a wireless apparatus including a primary receiver and a secondary receiver, the secondary receiver adapted for multiple-antenna receive diversity in the wireless apparatus;
• estimating a load on network capacity;
• enabling the second receiver as a function of the estimated capacity usage of the wireless apparatus and the estimated load on network capacity,
• wherein the estimated capacity usage of the wireless apparatus is given as ECT/OR, wherein IOR represents the total energy per chip of all channels transmitting from a transmitter in the network, and ECT represents energy per chip of a traffic channel,
• wherein the estimated load on network capacity is given as IOR/ECP, wherein IOR represents the total energy per chip for all channels transmitting from the transmitter in the network and ECP represents energy per chip of a pilot signal, and
• wherein said enabling the second receiver includes:
• calculating a capacity estimate as:
• CapacityEstimate=IOR/ECP+ECT/IOR;
• and
• enabling the second receiver as a function of the capacity estimate.

A method for estimating parameters of the wireless apparatus including primary receiver and a second receiver adapted for multiple-antenna receive diversity, comprising:

• estimating a parameter of the network;
• enabling the second receiver as a function of the estimated parameters;
• estimating a ratio of energy-of-traffic to energy-of-pilot;
• multiplying the ratio by a number of sectors in soft handoff to generate an adjusted ratio;
• filtering the adjusted ratio using a first time constant to generate a numerator;
• filtering the number of sectors in soft handoff using a second time constant to generate a denominator;
• generating an indicator dividing the numerator by the denominator;
• and
• using the indicator to control the second receiver.

The method as in 36, wherein:

• estimating the parameter of the wireless apparatus includes estimating an energy-of-traffic;
• estimating the parameter of the network includes estimating an energy-of-pilot;
• and
• enabling the second receiver as a function of a ratio of the estimated energy-of-traffic to the estimated energy-of-pilot.

A computer executable program product having computer readable code stored in a computer-readable medium, comprising:

• code for causing a computer to estimate a capacity usage of a wireless apparatus including a primary receiver and a secondary receiver, the secondary receiver adapted for multiple-antenna receive diversity in the wireless apparatus;
• code for causing a computer to estimate a load on network capacity;
• code for causing a computer to enable the second receiver as a function of the estimated capacity usage of the wireless apparatus and the estimated load on network capacity,
• wherein the estimated capacity usage of the wireless apparatus is given as ECT/IOR, wherein IOR represents the total energy per chip of all channels transmitting from a transmitter in the network, and ECT represents energy per chip of a traffic channel,
• wherein the estimated load on network capacity is given as IOR/ECP, wherein IOR represents the total energy per chip for all channels transmitting from the transmitter in the network and ECP represents energy per chip of a pilot signal, and
• wherein the code for causing a computer to enable the second receiver includes:
• code for causing a computer to calculate a capacity estimate as:
• CapacityEstimate=IOR/ECP+ECT/IOR;
• and
• code for causing a computer to enable the second receiver as a function of the capacity estimate.

A computer executable program product having computer readable code stored in a computer-readable medium, comprising:

• code for causing a computer to estimate a parameter of the wireless apparatus;
• code for causing a computer to estimate a parameter of the network;
• code for causing a computer to enable the second receiver as a function of the estimated parameters;
• code for causing a computer to estimate a ratio of energy-of-traffic to energy-of-pilot;
• code for causing a computer to multiply the ratio by a number of sectors in soft handoff to generate an adjusted ratio;
• code for causing a computer to filter the adjusted ratio using a first time constant to generate a numerator;
• code for causing a computer to filter the number of sectors in soft handoff using a second time constant to generate a denominator;
• code for causing a computer to generate an indicator dividing the numerator by the denominator;
• and
• code for causing a computer to use the indicator to control the second receiver.

The computer program product as in 51, wherein:

• the code for causing the computer to estimate the parameter of the wireless apparatus includes code for causing a computer to estimate an energy-of-traffic, and
• the code for causing a computer to estimate the parameter of the network includes code for causing a computer to estimate an energy-of-pilot;
• and
• further comprising code for causing a computer to enable the second receiver as a function of a ratio of the estimated energy-of-traffic to the estimated energy-of-pilot.