The Murchison Widefield Array ( MWA ) has collected hundreds of hours of Epoch of Reionization ( EoR ) data and now faces the challenge of overcoming foreground and systematic contamination to reduce the data to a cosmological measurement .
We introduce several novel analysis techniques such as cable reflection calibration , hyper-resolution gridding kernels , diffuse foreground model subtraction , and quality control methods .
Each change to the analysis pipeline is tested against a two dimensional power spectrum figure of merit to demonstrate improvement .
We incorporate the new techniques into a deep integration of 32 hours of MWA data .
This data set is used to place a systematic-limited upper limit on the cosmological power spectrum of \Delta ^ { 2 } \leq 2.7 \times 10 ^ { 4 } mK ^ { 2 } at k = 0.27 h Mpc ^ { -1 } and z = 7.1 , consistent with other published limits , and a modest improvement ( factor of 1.4 ) over previous MWA results .
From this deep analysis we have identified a list of improvements to be made to our EoR data analysis strategies .
These improvements will be implemented in the future and detailed in upcoming publications .