Design of the SC-FDE System Applied in Broadband HF Burst Communication

The application of FDE technique makes single carrier modulation a valuable alternative resisting multiple-path in broadband communication. The paper shows the principle of SC-FDE and propose a scheme applied in broadband HF channel in burst communication system. At last the paper shows the performance of scheme system under the DRM criterion channel. Introduction Recent years SC-FDE (Single-Carrier Frequency Domain Equalization) is more and more widely used by people owing to its advantages of low PARR (Peak-to average Ratio Requirements) and less sensitive to the frequency offset compared to OFMD (Orthogonal Frequency Division Multiplexing) system. The technology of frequency domain equalization is proposed to less down calculation of traditional way of timing equalization in SC system so that the occupied bandwidth can be raised. The paper provides a scheme with the SC-FDE system to complete the high data rate transmission under HF channel. Also gives the performance of SC-FDE system under the DRM criterion channels. SC-FDE System Design Principle of SC-FDE System. SC-FDE and OFDM are closed and have the similar means of signal processing. Fig. 1 shows the system flow of SC-FDE, the sending part firstly adopts technology of bit-to-symbol mapping, then the CPI module, and at last data frames are send through the channel to transmit after shaped filtering. At the receiving part, the UW in each data block is used to estimate the characteristics of the channel and get the equalizing coefficients. In the receiver, firstly data are sent into SYN module, this module is used to generate the frame data to generate the equalization. Then the data is converted to time domain by the IFFT module and UW is removed. At last the de-mapping and decision module generate the de-mapping and decision. [1]