Institute of Electrical & Electronic Engineers
For time-invariant frequency-selective channels, the transfer function is a superposition of waves having different propagation delays and path gains. In order to estimate the Frequency Correlation Function (FCF) of such channels, the frequency averaging technique can be utilized. The obtained FCF can be expressed as a sum of Auto-Terms (ATs) and Cross-Terms (CTs). The ATs are caused by the autocorrelation of individual path components. The CTs are due to the cross-correlation of different path components. These CTs have no physical meaning and leads to an estimation error. The authors propose a new estimation method aiming to improve the estimation accuracy of the FCF of a band-limited transfer function.