An in-band interference occurs when a part of transmission band is simultaneously used by another application and raise the noise floor and reduce signal ratio/noise ratio(SNR). In channel sounding, measurement campaigns are expensive and difficult to repeat since every channel data is valuable for a sound channel. In this study 'Minimum Norm' method was used to reduce the effect of interference in the frequency modulated continuous-wave (FMCW) channel data. The minimum norm method reduced the noise floor by about 20 dB for the channel data with in-band interference. © 2012 IEEE.