A linearly constrained least mean squares (lms) algorithm for complex signals is derived to minimize noise power in the array output. The original algorithm for real signals is
![W(k + 1) = P[W(k) - \\mu y(k)X(k)] + F](/images/tex/13217.gif)
. The complex form is shown to be
![W(k + 1) = P[W(k) - \\mu y(k)\\bar{X}(k)] + F](/images/tex/13218.gif)
, where the bar above

denotes complex conjugate.

, and

are complex.

and

are real.