Based On Cp Pilot In Ofdm Channel Estimation, The Theory Of Design

Due to its characters of highly using frequency resources and overcoming the channel fade, orthogonal frequency division multiplexing known as OFDM technical has been already considered to be the most crucial technical and standard. Under the complicated channel environment of wireless communication, it is indispensible to gain the precise channel estimators to estimate channel which is used to make up receiver information. All these structures origin from varied channel estimation schemes proposed, like LS pilots added method, etc. Unlike conventional structures, this thesis mainly designed a channel estimator architecture according to the following points:(1) Unlike conventional pilots types, here proposed a type of cyclic-prefix pilots, that is, transform cyclic-prefix into frequency domain. This thesis studied this kind of new pilots added estimator, compared its performance with conventional pilots added estimators in MSE that depended on the sub-carriers.(2) Therefore, we designed an algorithm restructuring the sub-carriers aiming to raise the new type of cyclic-prefix pilots, we utilized the constrain model, used Lagrange resolving tool to get the result, simulations verified this new estimator better than any types of sub-carriers pilots estimators.(3) Based on the above, because of the varying of total sub-carriers, we designed an new estimator which used the linear fitting wiener filtering method to reduce in receiver, named as external balance, meanwhile, used cyclic-prefix pilots estimator as the internal balance, combined both, the new type of estimator even surpassed the performance of best MMSE estimator in low signal to noise ratio.This thesis utilized the double loyal structure for receiver balance, innovatively, we used the cyclic-prefix, transformed it into pilot, compare it with convention. Simulations showed that estimator has high precision as well as some robustness if synchronized well, thus has great values in theory.