Generating calibration data for a transmit diversity communication device
View Patent ↗Collecting calibration data includes receiving signals, where each signal is transmitted from a channel of a plurality of channels of a transmit diversity device. The signals are generated according to command points, where a command point comprises command parameter values of command parameters. A signal feature value is determined for each command point to yield a plurality of signal feature values. At least one signal feature value is associated with a command point that substantially yields the signal feature value.
1. A method for collecting calibration data, comprising:
sending a plurality of commands to a transmit diversity device, said commands to cause said transmit diversity device to transmit a respective plurality of signals;
receiving at a calibration system said plurality of signals from said transmit diversity device, each signal of the plurality of signals transmitted from a channel of a plurality of channels of a transmit diversity device, the plurality of signals generated according to a plurality of command points, a command point comprising a plurality of command parameter values of a plurality of command parameters;
establishing a null value for each command parameter of the plurality of command parameters to yield a plurality of null values, a null value for a command parameter representing a command parameter value that yields a minimum signal feature value of a signal feature; and
determining a signal feature value for each command point of the plurality of command points in accordance with the plurality of null values to yield a plurality of signal feature values;
associating at least one signal feature value of the plurality of signal feature values with a command point that substantially yields the at least one signal feature value; and
storing a table of said associations of signal feature values with command points in a memory in said calibration system.
2. The method of claim 1 , wherein the signal feature further comprises a transmit power of the plurality of signals.
3. The method of claim 1 , wherein the plurality of command parameters further comprise:
an I-branch parameter representing a real weight for weighting an I-branch of the transmit diversity device; and
a Q-branch parameter representing an imaginary weight for weighting an Q-branch of the transmit diversity device.
4. The method of claim 1 , wherein establishing a null value for each command parameter of the plurality of command parameters further comprises:
performing the following for each command parameter operating as a maintained command parameter:
maintaining the maintained command parameter at a nominal value of the maintained command parameter;
varying a scanned command parameter through a plurality of candidate null values;
measuring the signal feature of the plurality of signals to yield a plurality of null scanning signal feature values; and
establishing the null value of the scanned command parameter from the plurality of null scanning signal feature values.
5. The method of claim 4 , wherein establishing a null value for each command parameter of the plurality of command parameters further comprises:
performing the following for each command parameter operating as a maintained command parameter:
maintaining the maintained command parameter at a nominal value of the maintained command parameter;
varying a scanned command parameter through a plurality of candidate null values starting from a maximum candidate null value;
measuring the signal feature of the plurality of signals to yield a plurality of null scanning signal feature values; and
establishing the null value of the scanned command parameter from the plurality of null scanning signal feature values.
6. The method of claim 4 , wherein establishing a null value for each command parameter of the plurality of command parameters further comprises:
performing the following for each command parameter operating as a maintained command parameter:
maintaining the maintained command parameter at a nominal value of the maintained command parameter;
varying a scanned command parameter through a plurality of candidate null values according to a gradient search;
measuring the signal feature of the plurality of signals to yield a plurality of null scanning signal feature values; and
establishing the null value of the scanned command parameter from the plurality of null scanning signal feature values.
7. The method of claim 1 , wherein determining a signal feature value for each command point of the plurality of command points further comprises:
performing the following for each command parameter operating as a maintained command parameter:
maintaining the maintained command parameter at a null value of the maintained command parameter;
varying a scanned command parameter through a plurality of candidate command parameter values; and
measuring the signal feature of the plurality of signals to yield the plurality of signal feature values.
8. The method of claim 1 , wherein determining a signal feature value for each command point of the plurality of command points further comprises:
varying a scanned command parameter through a first command parameter value subset of a plurality of candidate command parameter values;
measuring the signal feature of the plurality of signals to yield a first signal feature value subset of the plurality of signal feature values, the first signal feature value subset comprising a signal feature value for each command parameter value of the first command parameter value subset; and
determining a signal feature value for each command parameter value of a second command parameter value subset of the plurality of candidate command parameter values by interpolation from the first signal feature value subset.
9. The method of claim 1 , wherein determining a signal feature value for each command point of the plurality of command points further comprises:
varying a scanned command parameter through a first command parameter value subset of a plurality of candidate command parameter values;
measuring the signal feature of the plurality of signals to yield a first signal feature value subset of the plurality of signal feature values, the first signal feature value subset comprising a signal feature value for each command parameter value of the first command parameter value subset; and
determining a signal feature value for each candidate parameter value of a second command parameter value subset of the plurality of second command parameter values according to a symmetry between the first command parameter value subset and the second command parameter value subset.
10. The method of claim 1 , further comprising:
determining from the associations a next signal feature value for a next command point distinct from the plurality of command points; and
associating the next signal feature value with the next command point.
11. A system for collecting calibration data, comprising:
an interface operable to:
send a plurality of commands to a transmit diversity device, said commands to cause said transmit diversity device to transmit a respective plurality of signals; and
receive said plurality of signals, each signal of the plurality of signals transmitted from a channel of a plurality of channels of said transmit diversity device, the plurality of signals generated according to a plurality of command points, a command point comprising a plurality of command parameter values of a plurality of command parameters; and
a transmit diversity tester coupled to the interface and operable to:
establish a null value for each command parameter of the plurality of command parameters to yield a plurality of null values, a null value for a command parameter representing a command parameter value that yields a minimum signal feature value of a signal feature;
determine a signal feature value for each command point of the plurality of command points to yield a plurality of signal feature values by determining the signal feature value for each command point of the plurality of command points in accordance with the plurality of null values;
associate at least one signal feature value of the plurality of signal feature values with a command point that substantially yields the at least one signal feature value; and
store a table of said associations of signal feature values with command points in a memory.
12. The system of claim 11 , wherein the signal feature further comprises a transmit power of the plurality of signals.
13. The system of claim 11 , wherein the plurality of command parameters further comprise:
an I-branch parameter representing a real weight for weighting an I-branch of the transmit diversity device; and
a Q-branch parameter representing an imaginary weight for weighting an Q-branch of the transmit diversity device.
14. The system of claim 11 , the transmit diversity tester further operable to establish a null value for each command parameter of the plurality of command parameters by:
performing the following for each command parameter operating as a maintained command parameter:
maintaining the maintained command parameter at a nominal value of the maintained command parameter;
varying a scanned command parameter through a plurality of candidate null values;
measuring the signal feature of the plurality of signals to yield a plurality of null scanning signal feature values; and
establishing the null value of the scanned command parameter from the plurality of null scanning signal feature values.
15. The system of claim 11 , the transmit diversity tester further operable to establish a null value for each command parameter of the plurality of command parameters by:
performing the following for each command parameter operating as a maintained command parameter:
maintaining the maintained command parameter at a nominal value of the maintained command parameter;
varying a scanned command parameter through a plurality of candidate null values starting from a maximum candidate null value;
measuring the signal feature of the plurality of signals to yield a plurality of null scanning signal feature values; and
establishing the null value of the scanned command parameter from the plurality of null scanning signal feature values.
16. The system of claim 11 , the transmit diversity tester further operable to establish a null value for each command parameter of the plurality of command parameters by:
performing the following for each command parameter operating as a maintained command parameter:
maintaining the maintained command parameter at a nominal value of the maintained command parameter;
varying a scanned command parameter through a plurality of candidate null values according to a gradient search;
measuring the signal feature of the plurality of signals to yield a plurality of null scanning signal feature values; and
establishing the null value of the scanned command parameter from the plurality of null scanning signal feature values.
17. The system of claim 11 , the transmit diversity tester further operable to determine a signal feature value for each command point of the plurality of command points by:
varying a scanned command parameter through a first command parameter value subset of a plurality of candidate command parameter values;
measuring the signal feature of the plurality of signals to yield a first signal feature value subset of the plurality of signal feature values, the first signal feature value subset comprising a signal feature value for each command parameter value of the first command parameter value subset; and
determining a signal feature value for each command parameter value of a second command parameter value subset of the plurality of candidate command parameter values by interpolation from the first signal feature value subset.
18. The system of claim 11 , the transmit diversity tester further operable to determine a signal feature value for each command point of the plurality of command points by:
varying a scanned command parameter through a first command parameter value subset of a plurality of candidate command parameter values;
measuring the signal feature of the plurality of signals to yield a first signal feature value subset of the plurality of signal feature values, the first signal feature value subset comprising a signal feature value for each command parameter value of the first command parameter value subset; and
determining a signal feature value for each candidate parameter value of a second command parameter value subset of the plurality of second command parameter values according to a symmetry between the first command parameter value subset and the second command parameter value subset.
19. The system of claim 11 , the transmit diversity tester further operable to:
determine from the associations a next signal feature value for a next command point distinct from the plurality of command points; and associate the next signal feature value with the next command point.
20. A system for collecting calibration data, comprising:
an interface operable to:
send a plurality of commands to a transmit diversity device, said commands to cause said transmit diversity device to transmit a respective plurality of signals;
receive said plurality of signals, each signal of the plurality of signals transmitted from a channel of a plurality of channels of said transmit diversity device, the plurality of signals generated according to a plurality of command points, a command point comprising a plurality of command parameter values of a plurality of command parameters; and
a transmit diversity tester coupled to the interface and operable to:
determine a signal feature value for each command point of the plurality of command points to yield a plurality of signal feature values by:
performing the following for each command parameter operating as a maintained command parameter:
maintaining the maintained command parameter at a null value of the maintained command parameter;
varying a scanned command parameter through a plurality of candidate command parameter values; and
measuring the signal feature of the plurality of signals to yield the plurality of signal feature values;
associate at least one signal feature value of the plurality of signal feature values with a command point that substantially yields the at least one signal feature value; and
store a table of said associations of signal feature values with command points in a memory.
21. Non-transitory logic for collecting calibration data, the logic embodied in one or more computer-readable media and when executed operable to:
send a plurality of commands to a transmit diversity device, said commands to cause said transmit diversity device to transmit a respective plurality of signals;
receive said plurality of signals, each signal of the plurality of signals transmitted from a channel of a plurality of channels of a transmit diversity device, the plurality of signals generated according to a plurality of command points, a command point comprising a plurality of command parameter values of a plurality of command parameters;
establish a null value for each command parameter of the plurality of command parameters to yield a plurality of null values, a null value for a command parameter representing a command parameter value that yields a minimum signal feature value of a signal feature; and
determine a signal feature value for each command point of the plurality of command points to yield a plurality of signal feature values by determining the signal feature value for each command point of the plurality of command points in accordance with the plurality of null values;
associate at least one signal feature value of the plurality of signal feature values with a command point that substantially yields the at least one signal feature value; and
store a table of said associations of signal feature values with command points in a memory in said calibration system.
22. The non-transitory logic of claim 21 , wherein the signal feature further comprises a transmit power of the plurality of signals.
23. The non-transitory logic of claim 21 , wherein the plurality of command parameters further comprise:
an I-branch parameter representing a real weight for weighting an I-branch of the transmit diversity device; and
a Q-branch parameter representing an imaginary weight for weighting an Q-branch of the transmit diversity device.
24. The non-transitory logic of claim 21 , further operable to establish a null value for each command parameter of the plurality of command parameters by:
performing the following for each command parameter operating as a maintained command parameter:
maintaining the maintained command parameter at a nominal value of the maintained command parameter;
varying a scanned command parameter through a plurality of candidate null values;
measuring the signal feature of the plurality of signals to yield a plurality of null scanning signal feature values; and
establishing the null value of the scanned command parameter from the plurality of null scanning signal feature values.
25. The non-transitory logic of claim 21 , further operable to establish a null value for each command parameter of the plurality of command parameters by:
performing the following for each command parameter operating as a maintained command parameter:
maintaining the maintained command parameter at a nominal value of the maintained command parameter;
varying a scanned command parameter through a plurality of candidate null values starting from a maximum candidate null value;
measuring the signal feature of the plurality of signals to yield a plurality of null scanning signal feature values; and
establishing the null value of the scanned command parameter from the plurality of null scanning signal feature values.
26. The non-transitory logic of claim 21 , further operable to establish a null value for each command parameter of the plurality of command parameters by:
performing the following for each command parameter operating as a maintained command parameter:
maintaining the maintained command parameter at a nominal value of the maintained command parameter;
varying a scanned command parameter through a plurality of candidate null values according to a gradient search;
measuring the signal feature of the plurality of signals to yield a plurality of null scanning signal feature values; and
establishing the null value of the scanned command parameter from the plurality of null scanning signal feature values.
27. The non-transitory logic of claim 21 , further operable to determine a signal feature value for each command point of the plurality of command points by:
performing the following for each command parameter operating as a maintained command parameter:
maintaining the maintained command parameter at a null value of the maintained command parameter;
varying a scanned command parameter through a plurality of candidate command parameter values; and
measuring the signal feature of the plurality of signals to yield the plurality of signal feature values.
28. The non-transitory logic of claim 21 , further operable to determine a signal feature value for each command point of the plurality of command points by:
varying a scanned command parameter through a first command parameter value subset of a plurality of candidate command parameter values;
measuring the signal feature of the plurality of signals to yield a first signal feature value subset of the plurality of signal feature values, the first signal feature value subset comprising a signal feature value for each command parameter value of the first command parameter value subset; and
determining a signal feature value for each command parameter value of a second command parameter value subset of the plurality of candidate command parameter values by interpolation from the first signal feature value subset.
29. The non-transitory logic of claim 21 , further operable to determine a signal feature value for each command point of the plurality of command points by:
varying a scanned command parameter through a first command parameter value subset of a plurality of candidate command parameter values;
measuring the signal feature of the plurality of signals to yield a first signal feature value subset of the plurality of signal feature values, the first signal feature value subset comprising a signal feature value for each command parameter value of the first command parameter value subset; and
determining a signal feature value for each candidate parameter value of a second command parameter value subset of the plurality of second command parameter values according to a symmetry between the first command parameter value subset and the second command parameter value subset.
30. The non-transitory logic of claim 21 , further operable to:
determine from the associations a next signal feature value for a next command point distinct from the plurality of command points; and
associate the next signal feature value with the next command point.
31. A method for collecting calibration data, comprising:
receiving a plurality of signals, each signal of the plurality of signals transmitted from a channel of a plurality of channels of a transmit diversity device, the plurality of signals generated according to a plurality of command points, a command point comprising a plurality of command parameter values of a plurality of command parameters, the plurality of command parameters comprising:
an I-branch parameter representing a real weight for weighting an I-branch of the transmit diversity device; and
a Q-branch parameter representing an imaginary weight for weighting an Q-branch of the transmit diversity device;
establishing a null value for each command parameter of the plurality of command parameters to yield a plurality of null values, a null value for a command parameter representing a command parameter value that yields a minimum signal feature value of a signal feature establishing a null value for each command parameter of the plurality of command parameters further comprising:
performing the following for each command parameter operating as a maintained command parameter:
maintaining the maintained command parameter at a nominal value of the maintained command parameter;
varying a scanned command parameter through a plurality of candidate null values;
measuring the signal feature of the plurality of signals to yield a plurality of null scanning signal feature values; and
establishing the null value of the scanned command parameter from the plurality of null scanning signal feature values;
performing the following for each command parameter operating as a maintained command parameter:
maintaining the maintained command parameter at a nominal value of the maintained command parameter;
varying a scanned command parameter through a plurality of candidate null values starting from a maximum candidate null value;
measuring the signal feature of the plurality of signals to yield a plurality of null scanning signal feature values; and
establishing the null value of the scanned command parameter from the plurality of null scanning signal feature values; and
performing the following for each command parameter operating as a maintained command parameter:
maintaining the maintained command parameter at a nominal value of the maintained command parameter;
varying a scanned command parameter through a plurality of candidate null values according to a gradient search;
measuring the signal feature of the plurality of signals to yield a plurality of null scanning signal feature values; and
establishing the null value of the scanned command parameter from the plurality of null scanning signal feature values;
determining a signal feature value for each command point of the plurality of command points in accordance with the plurality of null values to yield a plurality of signal feature values, the signal feature comprising a transmit power of the plurality of signals, determining a signal feature value for each command point of the plurality of command points further comprising:
performing the following for each command parameter operating as a maintained command parameter:
maintaining the maintained command parameter at a null value of the maintained command parameter;
varying a scanned command parameter through a plurality of candidate command parameter values; and
measuring the signal feature of the plurality of signals to yield the plurality of signal feature values;
determining a signal feature value for each command point of the plurality of command points further comprising:
varying a scanned command parameter through a first command parameter value subset of a plurality of candidate command parameter values;
measuring the signal feature of the plurality of signals to yield a first signal feature value subset of the plurality of signal feature values, the first signal feature value subset comprising a signal feature value for each command parameter value of the first command parameter value subset; and
determining a signal feature value for each command parameter value of a second command parameter value subset of the plurality of candidate command parameter values by interpolation from the first signal feature value subset; and
determining a signal feature value for each command point of the plurality of command points further comprising:
varying a scanned command parameter through a first command parameter value subset of a plurality of candidate command parameter values;
measuring the signal feature of the plurality of signals to yield a first signal feature value subset of the plurality of signal feature values, the first signal feature value subset comprising a signal feature value for each command parameter value of the first command parameter value subset; and
determining a signal feature value for each candidate parameter value of a second command parameter value subset of the plurality of second command parameter values according to a symmetry between the first command parameter value subset and the second command parameter value subset;
associating at least one signal feature value of the plurality of signal feature values with a command point that substantially yields the at least one signal feature value;
determining from the associations a next signal feature value for a next command point distinct from the plurality of command points; and
associating the next signal feature value with the next command point.