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We use the Fisher matrix formalism to predict the prospects of measuring theredshifted 21-cm power spectrum in different $k$-bins using observations withthe upcoming Ooty Wide Field Array (OWFA) which will operate at $326.5 {\rmMHZ}$. This corresponds to neutral hydrogen (HI) at $z=3.35$, and a measurementof the 21-cm power spectrum provides an unique method to probe the large-scalestructures at this redshift. Our analysis indicates that a $5 \sigma$ detectionof the binned power spectrum is possible in the $k$ range $0.05 \leq k \leq 0.3\, {\rm Mpc}^{-1}$ with $1,000$ hours of observation. We find that theSignal-to-Noise ratio (${\rm SNR}$) peaks in the $k$ range $0.1- 0.2\, {\rmMpc}^{-1}$ where a $10 \sigma$ detection is possible with $2,000$ hours ofobservations. Our analysis also indicates that it is not very advantageous toobserve much beyond $1,000$ hours in a single field of view as the ${\rm SNR}$increases rather slowly beyond this in many of the small $k$-bins. The entireanalysis reported here assumes that the foregrounds have been completelyremoved.

Fisher Matrix Based Predictions for Measuring the z = 3.35 Binned 21-cm Power Spectrum using the Ooty Wide Field Array (OWFA)