Method, system and apparatus for the control of transmit diversity
First Claim
1. A method for modifying a transmit diversity signal comprising:
- receiving at least one input parameter;
calculating at least one virtual parameter based on said at least one input parameter;
converting said at least one virtual parameter into an actual parameter; and
modifying a transmit diversity signal based on said actual parameter,wherein said actual parameter has a discrete value having lower resolution than said at least one virtual parameter,wherein converting said at least one virtual parameter into said actual parameter comprises mapping any of a plurality of virtual parameter values to a single actual parameter value, andwherein converting said at least one virtual parameter into said actual parameter comprises truncating said virtual parameter to obtain said actual parameter value, where the truncation is performed according to the formula;
Φ
act=b*floor((Φ
virt+a/b),where Φ
virt is a virtual parameter,Φ
act is an actual parameter, anda and b are selected numerical values.
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Abstract
A method, apparatus and system for modifying a transmit diversity signal comprising receiving at least one input parameter, calculating at least one virtual parameter based on the at least one input parameter, converting the at least one virtual parameter into an actual parameter, and modifying a transmit diversity signal based on the actual parameter. Variations of the invention are possible, including mapping the input parameter to an actual parameter by various methods, for example, quantization, hysteresis and other methods. Embodiments of the invention may include an apparatus adapted to modify a transmit diversity signal comprising a processor to calculate at least one virtual parameter based on at least one input parameter, convert said at least one virtual parameter to an actual parameter, and modify said transmit diversity signal based on said actual parameter.
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Citations
27 Claims
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1. A method for modifying a transmit diversity signal comprising:
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receiving at least one input parameter; calculating at least one virtual parameter based on said at least one input parameter; converting said at least one virtual parameter into an actual parameter; and modifying a transmit diversity signal based on said actual parameter, wherein said actual parameter has a discrete value having lower resolution than said at least one virtual parameter, wherein converting said at least one virtual parameter into said actual parameter comprises mapping any of a plurality of virtual parameter values to a single actual parameter value, and wherein converting said at least one virtual parameter into said actual parameter comprises truncating said virtual parameter to obtain said actual parameter value, where the truncation is performed according to the formula;
Φ
act=b*floor((Φ
virt+a/b),where Φ
virt is a virtual parameter,Φ
act is an actual parameter, anda and b are selected numerical values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for modifying a transmit diversity signal comprising:
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receiving at least one input parameter; calculating at least one virtual parameter based on said at least one input parameter; converting said at least one virtual parameter into an actual parameter; and modifying a transmit diversity signal based on said actual parameter, wherein converting said at least one virtual parameter into said actual parameter comprises determining whether a difference between said at least one virtual parameter and an actual parameter value exceeds a hysteresis threshold value, wherein the hysteresis threshold value is determined from the following formula;
If (|Φ
virt,n−
Φ
act,n|>
Δ
Φ
th)
then set Φ
act,n+1=Φ
act,n+Δ
Φ
*sign (Φ
virt,n+1−
Φ
act,n)
else set Φ
act,n+1=Φ
act,n,where Φ
virt, n+1 is the virtual parameter computed for interval n+1,Δ
Φ
is the step increment of the actual parameter,Δ
Φ
th is a threshold value in virtual parameter required for change in actual parameter, andΦ
act, n and Φ
act, n+1 are the actual parameter computed for intervals n and n+1, respectively.
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13. A method for modifying a transmit diversity signal comprising:
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receiving at least one input parameter; calculating at least one virtual parameter based on said at least one input parameter; converting said at least one virtual parameter into an actual parameter; and modifying a transmit diversity signal based on said actual parameter, wherein the timing of said converting said at least one virtual parameter into an actual parameter is based on a trigger function, and wherein the trigger function comprises the following;
If (|Φ
virt,n−
Φ
virt,n−
D1|>
Δ
Φ
th AND (n−
nprev)>
D2)
then set Φ
act,n+1=Φ
act,n+Δ
Φ
*sign (Φ
virt,n−
Φ
virt,n−
D1)
else set Φ
act,n+1=Φ
act,n,where Φ
virt, n and Φ
virt, n+1 are the virtual parameter computed for intervals n and n+1, respectively,Δ
Φ
is the step increment of the actual parameter,Δ
Φ
th is a threshold value in virtual parameter required for change in actual parameter,Φ
act, n and Φ
act, n+1 are the actual parameter computed for intervals n and n+1, respectively,nprev is the time of the immediately preceding change of actual parameter, D1 is the time interval over which the slope of the virtual parameter is computed, and D2 is the minimum time interval between changes of actual parameter. - View Dependent Claims (14, 15)
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16. An apparatus adapted to modify a transmit diversity signal, the apparatus comprising:
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a processor to calculate at least one virtual parameter based on at least one input parameter, convert said at least one virtual parameter to an actual parameter, and modify said transmit diversity signal based on said actual parameter, wherein converting said at least one virtual parameter into said actual parameter comprises determining whether a difference between said virtual parameter and an actual parameter value exceeds a hysteresis threshold value, and wherein the hysteresis threshold value is determined from the following formula;
If (|Φ
virt,n+1−
Φ
act,n|>
Δ
Φ
th)
then set Φ
act,n+1=Φ
act,n+Δ
Φ
*sign (Φ
virt,n+1−
Φ
act,n)
else set Φ
act,n+1=Φ
act,n,where Φ
virt, n+1 is the virtual parameter computed for interval n+1,Δ
Φ
is the step increment of the actual parameter,Δ
Φ
th is a threshold value in virtual parameter required for change in actual parameter,Φ
act, n and Φ
act, n+1 are the actual parameter computed for intervals n and n+1, respectively. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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24. A transmit diversity method comprising:
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modifying, by a modification amount, a transmit diversity signal parameter, said modification amount based on a calculation performed on at least one feedback parameter, wherein said modification is performed if a result of the calculation is based on a trigger function, wherein the timing of said converting said at least one virtual parameter into an actual parameter is based on a trigger function, and wherein the trigger function comprises the following;
If (|Φ
virt,n−
Φ
virt,n−
D1|>
Δ
Φ
th AND (n−
nprev)>
D2)
then set Φ
act,n+1=Φ
act,n+Δ
Φ
*sign (Φ
virt,n−
Φ
virt,n−
D1)
else set Φ
act,n+1=Φ
act,n,where Φ
virt, n and Φ
virt, n+1 are the virtual parameter computed for intervals n and n+1, respectively,Δ
Φ
is the step increment of the actual parameter,Δ
Φ
th is a threshold value in virtual parameter required for change in actual parameter,Φ
act, n and Φ
act, n+1 are the actual parameter computed for intervals n and n+1, respectively,nprev is the time of the immediately preceding change of actual parameter, D1 is the time interval over which the slope of the virtual parameter is computed, and D2 is the minimum time interval between changes of actual parameter. - View Dependent Claims (25, 26, 27)
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Specification