“…In [21] and [22], it was shown that there exists a for each assignment of , and in [1] it was finally proved that this assignment is unique and smooth, yielding a complete parameterization suitable for tuning. Consequently, the rational covariance extension problem reduces to a trigonometric moment problem, where, for each , the remaining problem is to determine a unique such that (5) In [3] and [4], a convex optimization procedure to determine these was introduced, a result that has then been generalized in several directions [5]- [7], [9], [10], [17], [19], [23], [24].…”