Method and apparatus for estimating a signal-to-interference ratio

摘要

A method and apparatus for estimating a signal-to-interference 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.

主权项

1. A method of estimating signal power, the method comprising:
receiving a first signal, wherein the first signal carries modulated symbols and includes noise; transforming symbol energy of the first signal to a real part and noise energy of the first signal to an imaginary part by multiplying the first signal with a complex conjugate of a second signal, wherein the second signal is a pilot signal that is a priori known and represents the first signal uncorrupted by noise and the second signal has a real component and an imaginary component; and computing signal power from the real part of the first signal after the transformation.