A Study Of Single Carrier Frequency Domain Equalization

People’s life has very large changes with the rapid development of broadband wireless communication. In order to offer the high quality of communication, how to improve the quality of communication has been continuously discussed. In high data rate wireless communication, we have a challenging problem that is how to eliminate the multipath delay spread and Doppler effect.In recent years, Orthogonal Frequency Division Multiplexing(OFDM) is a widely used transmission technology because of the low complexity and the ability of resistance to interference. However, Single Carrier Frequency Domain Equalization(SC-FDE) has anti-multipath performance and complexity the same as OFDM. In addition, SC-FDE has low Peak-to-Average Power Ratio(PAPR) and overcomes frequency effect sensitive, it becomes a strong competitor of OFDM, often as OFDM options appear.First of all, this paper introduces the wireless communication system channel characteristics and analyzed the wireless channel’s impacts on digital signal transmission as well as the fading channel statistical model. Then this paper analyzes the dynamic characteristics of broadband wireless channel pointing out the two time-frequency selectivity caused by the time proliferation of multi-path and Doppler effect. At last this paper analyzes the simulation of the SUI channel model giving the time-frequency characteristics of SUI-5 channel model.Secondly, this paper introduces the classification, the basic principle, the criterion and the algorithms of equalization technology. After that, it introduces the SC-FDE the composition,the basic principle and the channel estimation. The principles of Linear Equalization and Decision Feedback Equalization are introduced, then, it analyzes the performance of them.In the last part of article,this paper introduces the Iterative Block Decision Feedback Equalization(IBDFE) algorithm. Single-carrier transmission with frequency-domain equalization offers a viable design alternative to the classic orthogonal frequency-division multiplexing technique. Based on the minimum-mean-square-error(MMSE) criterion, a simplified parameter estimationmethod is introduced to calculate the coefficients of the feedforward and feedback filters, which significantly reduces the implementation complexity of the equalizer. Simulation results show that the performance of the proposed simplified design is similar to the traditional iterative block DFE under various multipath fading channels, but it imposes a much lower complexity than the latter.