Pilot information gain control method and apparatus
View Patent ↗Various gain factors for pilot information are used to determine a corresponding plurality of likely channel performance values for a plurality of data channels (and/or services). The resultant information is used to select a specific gain factor to apply when transmitting the pilot information. In one embodiment, the gain factor that correlates to the highest signal to interference plus noise ratio is used.
1. A method of determining a pilot transmission power value for multiple time-multiplexed data services that are code-multiplexed with a pilot channel from a user, the method comprising the steps of:
providing a plurality of time multiplexed data services;
providing pilot information;
determining a user performance value for each of a plurality of pilot transmission power values according to
Q
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where β m is the m-th pilot transmission power value, K j is the number of rate-matched bits per power control group used for data service i, w i is the weight given to data service i, and N is the total number of data services;
selecting a selected pilot transmission power value β m to use with the pilot information as a function, at least in part, of the plurality of determined corresponding performance values.
2. The method of claim 1 wherein providing the pilot information includes providing a control channel.
3. The method of claim 2 wherein providing a control channel includes providing at least one pilot symbol.
4. The method of claim 2 wherein the control channel has a corresponding orthogonal variable spreading factor code.
5. The method of claim 1 wherein providing a plurality of data services includes providing at least one time multiplexed data service.
6. The method of claim 1 wherein determining a user performance value includes assigning a weight to each data service.
7. The method of claim 1 wherein selecting a pilot transmission power value to use with the pilot information as a function, at least in part, of the plurality of corresponding user performance values includes selecting a pilot transmission power value to use with the pilot information that corresponds to a best one of the user performance values.
8. The method of claim 1 and further comprising using the selected pilot transmission power value when transmitting the pilot information and the plurality of data services.
9. The method of claim 1 and further comprising transmitting the selected pilot transmission power value to subsequent use by a receiving unit.
10. The method of claim 1 wherein determining a likely channel performance value includes calculating the likely channel performance value.
11. An apparatus comprising:
a wireless transmitter;
a differential-gain amplifier operably coupled to the wireless transmitter;
at least a first and second data channel operably coupled to the wireless transmitter;
a pilot information source operably coupled to the wireless transmitter;
a power controller operably coupled to the differential-gain amplifier and being arranged and configured to determine a user performance value for each of a plurality of pilot transmission power values according to
Q
m
=
∑
i
=
1
l
w
×
β
m
K
i
(
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K
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1
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(
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where β m is the m-th pilot transmission power value, K j is the number of rate-matched bits per power control group used for data service i, w i is the weight given to data service i, and N is the total number of data services and to select a selected pilot transmission power value to provide variable power to pilot information and the data channels from the pilot information source based on the plurality of corresponding pilot transmission power value as a function, at least in part, user performance values when transmitted by the wireless transmitter.
12. The apparatus of claim 11 wherein the power controller includes means for:
determining a user performance value for each of the data channels for each of a plurality of pilot transmission power values;
selecting a pilot transmission power value to use with the pilot information as a function, at least in part, of the plurality of corresponding user performance values.
13. The apparatus of claim 12 wherein the user performance value comprises a signal to interference plus noise value.
14. The apparatus of claim 11 wherein the apparatus comprises a portable wireless communication device.
15. A method of determining power transmission value for multiple data channels multiplexed with a pilot channel from a user, the method comprising the steps of:
providing a portable wireless communication device;
providing a plurality of code division multiple access data channels;
providing a code division multiple access control channel having pilot information;
at the portable wireless communication device, determining a user performance value for each of a plurality of pilot transmission power values according to
Q
m
=
∑
i
=
1
l
w
i
×
β
m
K
i
(
β
m
K
i
+
1
)
(
β
m
+
1
)
where β m is the m-th pilot transmission power value, K j is the number of rate-matched bits per power control group used for data service i, w i is the weight given to data service i, and N is the total number of data services;
at the portable wireless communication device, selecting a selected pilot transmission power value β m to use with the pilot information as a function, at least in part, of the plurality of determined corresponding performance values.