Effects of Noise Cut for Extraction of Wideband Channel Parameters

Effects of noise cut for extracting wideband channel parameters were investigated by 15, 20, 25, and 30 dB fixed levels, and a method of dynamic noise cut. The comparisons are given by deriving the power delay profiles (PDPs), the rms delay spread (DS), number of paths (NoPs) and Ricean K-factors based on indoor-to-outdoor wideband measurements at 5.25 GHz with RF bandwidth of 100 MHz. The conclusion is that the traditional method using fixed level noise cut is in general under estimate the DS and NoPs. K- factors are not sensitive to noise irrespective of what kind of method is applied and how deep of the fixed levels. The PDPs are not very sensitive to fixed level noise cut, however, obvious changes can be observed by dynamic noise cut. The dynamic noise cut is preferred in case of clear noise floors for the measured IRs.