Calculating Optimal Weights for MVDR Signal Processing Gain

[nikki92]

Using a MVDR method for a uniformly spaced linear array of sensors, I calculated the optimal weights. The procesing gain is (SIR)out / (SIR)in . The value turned out complex. Is this possible/makes sense?

 

[meBigGuy]

A phase shift would be represented by a complex gain.

 

[nikki92]

Thanks! So the power is simply represented by the real part?

 

[meBigGuy]

No. The magnitude of the output determines the power. Complex numbers can be thought of as real and imaginary (in-phase and quadrature components), or as a magnitude at a phase angle.