This　paper　targets　at　enhancing　the　noisy　soundfield　over　the　entire　recording　area　and　all　the　individual　channels,　while　preserving　the　spatial　clues　of　the　original　soundfield.　For　the　goal,　we　utilize　a　recently　proposed　spherical　harmonics　(SH)　domain　feature　denoted　relative　harmonic　coefficients　(RHC)　as　it　compactly　contains　the　source＇s　spatial　information.　Specifically,　we　(i)　propose　an　unbiased　estimator　of　RHC　in　noisy　environments;　(ii)　estimate　the　source　signal　in　noisy　environments　using　a　SH　domain　beamformer;　(iii)　enhance　the　SH　coefficients　by　multiplying　the　estimated　RHC　and　source　signal;　and　(iv)　reconstruct　the　entire　soundfield　based　on　the　enhanced　SH　coefficients.　Finally,　we　evaluate　and　validate　the　performance　of　the　enhancement　algorithm　using　extensive　simulations.　©　2024　International　Speech　Communication　Association.　All　rights　reserved.