Channel estimation method, device, equipment and medium based on space-frequency block code

Abstract

The invention discloses a channel estimation method based on space-frequency block codes, which includes: using the receiving signals and sending signals of two adjacent sub-carriers to determine the initial channel estimation value; using the receiving signals and sending signals of each group of sub-carriers to determine the target Symbol timing deviation: using the target symbol timing deviation to perform phase correction on the initial channel estimation value to obtain the final target channel estimation value. It can be seen that when this scheme performs channel estimation based on space-frequency block codes, it is necessary to calculate the target symbol timing deviation, and use the target symbol timing deviation to perform phase correction on the initial channel estimation value. In this way, the symbol timing introduced by the symbol timing can be avoided. The problem of decoding failure due to deviation can ensure the reliability of decoding; the invention also discloses a channel estimation device, equipment and medium based on space-frequency block codes, which can also achieve the above-mentioned technical effects.

Description

technical field [0001] The present invention relates to the technical field of mobile communication systems, and more specifically, to a channel estimation method, device, equipment and medium based on space-frequency block codes. Background technique [0002] MIMO (multiple-input multiple-output)-OFDM (orthogonal frequency division multiplexing, orthogonal frequency division multiplexing technology) system is to arrange multiple The multiple-input multiple-output system MIMO composed of antennas combines the characteristics of MIMO system with high diversity gain, large system capacity, and OFDM system's anti-frequency selective fading and high spectrum utilization. Driven by the requirements, it is receiving more and more attention. [0003] In MIMO technology, from the perspective of improving space diversity, space-time block coding (space-time blockcoding, STBC) due to its orthogonal design, makes the maximum likelihood decoding only require linear complexity, so it is...

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Problems solved by technology

[0005] However, if the Alamouti space-time code scheme is combined with the OFDM system to form a MIMO-OFDM system, the timing deviation introduced by the symbol timing will cause an additional linear phase shift in the frequency-domain equivalent channel of the received data, so that the Alamouti code The requirement of slow channel change in the same coding block cannot be met, which leads to decoding failure

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