The new scheme for data rate improvement in HF communication without using equalizer

In this paper the new and improvement approach is suggested for realization of a HF receiver without using equalizer. This approach is based on implementing considerations suggested in 2000. In our approach an HF modem without using equalizer implemented which can communicate over several hundred bits per second with very low bits error rate. This improvement was obtained by changing the framing and the coding structures, which has been suggested in 2000, and by using the symbol time recovery approach, which is proposed by Zhu et al. (2003). In this paper, the symbol time recovery approach generalized for multipath fading channels. We implemented our approach on digital signal processor named TMS320F2811. Empirical results verified this new modem features.