Date Added: Nov 2009
High Frequency (HF) channel is a difficult medium for data transmission. Multi-carrier transmission over HF channel is used to avoid effects of frequency-selective fading. In this paper, the authors present algorithms for estimation of symbol and frame timing of particular HF packet-radio signals. In particular, they analyze the proposed data-aided frame timing estimation method. Propagation of radio signals in High Frequency (HF) band suffers significant degradation. Multipath propagation and various ionosphere effects cause time dispersion, Doppler shift, and frequency selective fading.