Circular AR models are just a simplification of the circular
ARMA models discussed in Section 9.1.6, with .
An order autoregressive (AR) process is defined by
the innovation variance
and the AR coefficients
.
The circular power spectrum of a circular AR process is given by

(10.4) 
where , is the DFT of the
AR parameters zeropadded to length :
.
Baggenstoss
20170519