In the next generation wireless communication systems,OFDM and MIMO system is widely used for the demand of higher transfer rates and lager system capacity. It challenges the channel estimation technique a lot.The channel estimation method based on men's nike shoes training sequence offers less complexity and better performance.In this thesis sequence-based OFDM-MIMO channel estimation is discussed.The main work is just as follows:The thesis begins with the introduction to basic concept and method of channel estimation ,OFDM and MIMO women's nike shoes system model is summarized.Then channel estimation based on some kind of training sequence and channel estimation under constraints is discussed.The results of simulation is given.The thesis lays an chi flat iron emphasis on the design of the training sequence,for the training sequence influence the quality of the channel estimation.(1)The wireless communication channel characteristic and basic channel estimation chi hair straighteners methods are summarized.(2)MIMO ,OFDM system and channel model are given,and several kinds of channel estimation methods based on training sequence are presented.(3)MIMO channel estimation based on complementary Golay sequence is discussed,and simulation result is given.From theoretic analysis and simulation result,it achieve a better performance.(4) Implicit MIMO channel estimation based on ZCZ training sequences is discussed. by choosing properly a set of ZCZ hair straighteners sequences with balanced property, the harmful dc-offset can be completely removed, thus exhibiting significantly better estimation performance and resulting in simpler implementation when compared with the conventional implicit training schemes without dc-offset elimination and with dc-offset elimination based on perfect sequences.(5)OFDM-MIMO channel estimation based on training sequence under constraints is discussed. A method of designing near-optimal training sequences using nonlinear optimization techniques is proposed.The research of the thesis can provide some good references to the wireless mobile communication systems design. It ends with the possible direction for the future research.
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