Performance of Channel Prediction for Wireless Downlink Packet Systems

Channel prediction is an appealing approach to mitigate channel mismatch in wireless downlink packet systems. Channel mismatch arises due to the delay in the feedback loop. Both synthetic and measured channels were used to assess the accuracy of channel prediction for various ratios of specular to diffuse power. It has been found that high ratios (K factors greater than 10) are necessary for prediction greater than 1 wavelength. K factors of measured channels gave prediction accuracy similar to that of the synthetic channel given by the same K factor. This leads us to suggest a channel model where spectrum is split into two parts Sd=Sdiscrete+Scontinuous, where Sdiscrete is easy to predict and Scontinuous is difficult.