New technique for enhancing the signaling in slowly fading dispersive channels

  • Authors:

  • Said E. EL-Khamy;Walid M. Saad

  • Affiliations:

  • Dept. of Electrical Engineering, Faculty of Engineering, Alexandria University, Alexandria, Egypt;Dept. of comm. Engineering, Faculty of Engineering, Alexandria University, Alexandria, Egypt

  • Venue:
  • WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
  • Year:
  • 2009

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Abstract

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 channelaware 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.