Multiple input multiple output orthogonal frequency division multiplexing mobile communication system and channel estimation method

摘要

The present invention provides a channel estimation method for a Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing system, characterized by comprising steps of: for each of a plurality of receiving antennas of said Orthogonal Frequency Division Multiplexing system, calculating a channel impulse response sequence and a channel frequency response sequence for a channel between said receiving antenna and each transmitting antenna by using a pilot sequence received by said receiving antenna; wherein said pilot sequence is a comb pilot sequence, and the pilot symbols, to which each of said transmitting antennas corresponds, are located in the same position in frequency domain and separated from one another in time domain. The present invention further provides a corresponding mobile communication system. The pilot sequence of the present invention may be used in a wireless channel with a relatively high moving speed. The present invention considers the impact of virtual sub-carriers in a Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing system, and possesses relatively high performance and relatively low complexity.