METHOD AND APPARATUS FOR ESTIMATING A SIGNALTOINTERFERENCE RATIO
First Claim
1. A method of estimating signal power, the method comprising:
 receiving a signal, wherein the signal carries modulated symbols and includes noise;
transforming symbol energy of the signal to a real part and noise energy of the signal to an imaginary part by multiplying the signal with a complex conjugate of a second signal, wherein the second signal has a real component and an imaginary component; and
computing signal power from the real part of the signal after the transformation.
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Abstract
A method and apparatus for estimating a signaltointerference ratio (SIR) are disclosed. A received signal includes signal energy on multiple basis functions. Desired signal energy in the received signal is transformed onto a first basis function with constant polarity. The desired signal energy is estimated by coherently averaging signal energy on the first basis function. A noise power is estimated by averaging signal energy on each basis function other than the first basis function and accumulating the averaged signal energy from the basis function other than the first basis function and scaling the accumulated signal energy to account for a noise estimate from the first basis function. An SIR is estimated by dividing the desired signal energy by the noise power.
7 Citations
32 Claims

1. A method of estimating signal power, the method comprising:

receiving a signal, wherein the signal carries modulated symbols and includes noise; transforming symbol energy of the signal to a real part and noise energy of the signal to an imaginary part by multiplying the signal with a complex conjugate of a second signal, wherein the second signal has a real component and an imaginary component; and computing signal power from the real part of the signal after the transformation.  View Dependent Claims (2, 3, 4, 5, 6, 7)


8. A method of estimating noise power, the method comprising:

receiving a signal, wherein the signal carries modulated symbols and includes noise; transforming symbol energy of the signal to a real part and noise energy of the signal to an imaginary part by multiplying the signal with a complex conjugate of a second signal, wherein the second signal has a real component and an imaginary component; and computing noise power from the imaginary part of the signal after the transformation.  View Dependent Claims (9, 10, 11, 12, 13)


14. A method for estimating a signaltointerference ratio (SIR), the method comprising:

acquiring signal power for a first channel; acquiring noise power for a second channel; scaling the noise power based on a spreading factor associated with the first channel and a spreading factor associated the second channel; and computing SIR based on the signal power and the scaled noise power.  View Dependent Claims (15, 16)


17. An apparatus for estimating signal power, the apparatus comprising:

a receiver configured to receive a signal, wherein the signal carries modulated symbols and includes noise; a computation unit configured to transform symbol energy of the signal to a real part and noise energy of the signal to an imaginary part by multiplying the signal with a complex conjugate of a second signal, wherein the second signal has a real component and an imaginary component; and a power computation unit configured to compute signal power from the real part of the signal after the transformation.  View Dependent Claims (18, 19, 20, 21, 22, 23)


24. An apparatus for estimating noise power, the apparatus comprising:

a receiver configured to receive a signal, wherein the signal carries modulated symbols and includes noise; a computation unit configured to transform symbol energy of the signal to a real part and noise energy of the signal to an imaginary part by multiplying the signal with a complex conjugate of a second signal, wherein the second signal has a real component and an imaginary component; and a power computation unit configured to compute noise power from the imaginary part of the signal after the transformation.  View Dependent Claims (25, 26, 27, 28, 29)


30. An apparatus for estimating a signaltointerference ratio (SIR), the apparatus comprising:

a first unit configured to acquire signal power for a first channel; a second unit configured to acquire noise power for a second channel; a scaling unit configured to scale the noise power based on a spreading factor associated with the first channel and a spreading factor associated the second channel; and a computation unit configured to compute SIR based on the signal power and the scaled noise power.  View Dependent Claims (31, 32)

1 Specification