Simple Moving average model

Dear friends, could anyone help me to performe the following simple problem in matlab?
I want to estimate with maximum likelihood, a simple moving average(MA) model where the MA coefficients are constrained to sum to 1. In particular:

R(t) = a0*MA + a1*MA(t-1) + a2*MA(t-2) + ... + ak*MA(t-k)

1 = a0 + a1 + a2 + ... + ak

Thanks in advance.
.

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