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We have used the Fisher matrix formalism to quantify the prospects ofdetecting the z = 3.35 redshifted 21-cm HI power spectrum with the upcomingradio-imterferometric array OWFA. OWFA's frequency and baseline coverage spanscomoving Fourier modes (k) in the range 0.018 to 2.7 [1/Mpc]. The OWFA HIsignal, however, is predominantly from the range k below 0.2 [1/Mpc]. Thelarger modes, though abundant, do not contribute much to the HI signal. In thiswork we have focused on combining the entire signal to achieve a detection. Wefind that a 5-sigma detection of A_{HI} is possible with ~ 150 hr ofobservations, here A^2 _{HI} is the amplitude of the HI power spectrum. We havealso carried out a joint analysis for A_{HI} and the redshift space distortionparameter. Our study shows that OWFA is very sensitive to the amplitude of theHI power spectrum. However, the anisotropic distribution of the k modes doesnot make it very suitable for measuring the redshift space distortionparameter.

Fisher matrix predictions for detecting the cosmological 21 cm signal with the Ooty Wide Field Array (OWFA)