Channel state tracking method based on training sequence

Abstract

The present invention discloses a channel state tracking method based on a training sequence, wherein the method is suitable for an OFDM system and comprises the steps of: (1) obtaining channel impulse response information according to a known training sequence; (2) determining a decision parameter according to the channel impulse response information, wherein the decision parameter is used for characterizing the channel characteristic; and (3) deciding the current channel type from a plurality of channel types supposed beforehand according to the decision parameter. By adopting the channel state tracking method based on a training sequence, an OFDM receiver has the capability of tracking channel change in mobile reception environment, and can correspondingly adjust the channel estimatingmethod according to the channel change, thereby ensuring that the receiver can work in a better working state under a plurality of channel environments. The channel state tracking method based on a training sequence of the invention is especially suitable for a wireless communication system designed for reception in the mobile environment.

Description

technical field [0001] The invention relates to the field of wireless signal transmission, in particular to a training sequence-based channel state tracking method applied to a wireless communication system. Background technique [0002] In a wireless communication system, during the transmission process, in addition to the direct signal on the straight path, the transmitted signal will usually be reflected by one or more reflective objects and then reach the receiver through different propagation paths. These signals propagated through different paths have different signal amplitudes and phases, and after arriving at the receiver with a small time difference, mutual interference causes fluctuations in received signal strength, resulting in signal distortion. This is the multipath effect of the wireless propagation channel. Multipath effects often prolong the time it takes for a transmitted signal to reach a receiver. Usually, the time when the first detectable signal arri...

AI Technical Summary

Problems solved by technology

However, for a mobile system with a large change, its propagation channel usually changes with the change of the surrounding environment. Once the channel power delay characteristics change, it will make the pre-set interpolation method and interpolation system in some The environment is not optimal, which reduces the accuracy of channel estimation and affects the receiving performance of the receiver

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