急！哪位前辈帮忙翻译下英文摘要

The Orthogonal Frequency Division Multiplexing (OFDM) technology took one kind of future high speed wireless correspondence physics level the candidate technology has received the widespread attention. It has the high frequency spectrum efficiency and resists the multi-diameters ability, this enable it to have the suitable superiority in the wireless correspondence application, has become at present to solve one of high speed data transmission mainstream technologies. In wireless communications system, because the OFDM technology frequency spectrum use factor is very high, the anti-multi-diameter disturbance and frequency selectivity decline ability, uses the dynamic child carrier assignment technology to be able to enable the system to achieve the biggest bit rate and has the fast algorithm based on discrete Fourier transform (DFT) OFDM, therefore may have the very strong anti-fading ability.
The full text in introduced the OFDM basic principle and in the system model foundation, the key comparative analysis channel had estimated several algorithms, LS, MMSE and LMMSE and so on, the article altogether divides into three parts, first part of main exposition Orthogonal Frequency Division Multiplexing basic system model and principle and technical superiority: The second part mainly understands the present stage Orthogonal Frequency Division Multiplexing key technologies, including synchronization, channel estimate, and PARP solution: The third part is uses based on the pilot frequency OFDM channel estimated the method separately in the transmitting end, the receiving end and carried on comparative analysis several different algorithms through in the pilot frequency position gain channel information retrieval all time channel information foundation. And understands the OFDM most recent development tendency.