Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Adaptive blind timing recovery methods for MSE optimization | Chung EURASIP Journal on Advances in Signal Processing 2012 2012 9 http content 2012 1 9 o EURASIP Journal on Advances in Signal Processing a SpringerOpen Journal RESEARCH Open Access Adaptive blind timing recovery methods for MSE optimization Wonzoo Chung Abstract This article presents a non-data-aided adaptive symbol timing offset correction algorithm to enhance the equalization performance in the presence of long delay spread multipath channel. The optimal timing phase offset in the presence of multipath channels is the one jointly optimized with the receiver equalizer. The jointly optimized timing phase offset with a given fixed length equalizer should produce a discrete time channel response for which the equalizer achieves the minimum mean squared error among other discrete time channel responses sampled by different timing phases. We propose a blind adaptive baseband timing recovery algorithm producing a timing offset close to the jointly optimal timing phase compared to other existing non-data-aided timing recovery methods. The proposed algorithm operates independently from the equalizer with the same computational complexity as the widely used Gardner timing recovery algorithm. Simulation results show that the proposed timing recovery method can result in considerable enhancement of equalization performances. 1 Introduction A different sampling timing phase produces different channel responses in the presence of multipath channels. For finite length equalizers which are always insufficiently long in practice for wireless multimedia broadcasting systems such as advanced television systems committee ATSC receivers the mean squared error MSE performance of a fixed length minimum MSE MMSE equalizer depends on the sampled channel. Certain timing offsets yield channels relatively easy to equalize with baud-spaced equalizers and consequently the MSE performance of the MMSE equalizer of a given length is limited by the choice of timing .
