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| The technology of Multiple Input and Multiple Output (MIMO) is a breakthrough in the field of mobile communication. In this paper, we address the problem of MIMO time-variant channel estimation and propose a method based on the first-order statistics of received measurements. In the proposed method, periodic sequences with different periods are superimposed on the information-bearing symbols corresponding to different transmit antennas. And in this way, coefficients of different sub-channels can be separated for estimation. Simulations are given to verify effectiveness of the method. Besides, as an attempt to solve the problem of high peak-to-average symbol power ratio due to the superimposed sequences, a thorough analysis is given and optimal sequence in the sense of minimizing peak-to-average symbol power ration is designed. |
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| Keywords:MIMO channel, channel estimation, peak-to-average symbol power ratio |
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