New Technique for Enhancing the Signaling in Slowly Fading Dispersive Channels

Many techniques are proposed recently to avoid the performance degradation caused by the channel dispersion using slow frequency hopping (SFH) patterns. Matched frequency hopping (MFH) and clipped matched frequency hopping (CMFH) signals have been proposed as an efficient channel-aware signaling technique in slowly fading dispersive channels. An improved technique is presented in this paper by optimizing the channel frequency response which maximizes the frequency channels with low attenuation to be selected as a frequency hopping pattern and attenuates the frequency channels of high attenuation to be ignored in the selection of the frequency slots. In this technique the selection of the frequency slots will be improved by selecting the hopped frequencies concentrated in frequency slots of minimum attenuation and avoiding frequency slots of high attenuation. The results show enhanced performance of this new technique.