Channel prediction system and method for OFDM wireless communication system

Abstract

The invention discloses a channel prediction system and method for an OFDM wireless communication system. The channel prediction system comprises a standard echo state network and a two-layer adaptiveelastic network. In the method, for a subcarrier of each pilot OFDM symbol, frequency domain channel information of each subcarrier obtained by channel estimation is used to train an echo state network. The trained echo state network can realize short-term prediction of frequency domain channel information. In order to overcome the defect that the output weight in the echo state network is easy to be ill-conditioned, the output weight in the echo state network is estimated by using a two-layer adaptive elastic network. According to the method, the defect that the channel information of the traditional channel estimation is easy to expire is overcome, and single-step prediction and multi-step prediction can be realized with high precision. According to the method, the short-term predictionof the channel information of the OFDM wireless communication system can be realized, and a guarantee is provided for realizing adaptive transmission, adaptive coding and the like of wireless communication.

Description

technical field [0001] The present invention relates to the technical field of prediction of wireless communication channel information, in particular to a channel prediction system and method for OFDM wireless communication systems. Background technique [0002] With the development of science and technology, intelligent wireless network is the trend of future development. In adaptive transmission of wireless communication, channel state information is an indispensable part. In order to obtain channel state information, channel estimation algorithm is an optional method. However, channel estimation can only obtain the current channel state information, and when the channel changes drastically and the Doppler frequency shift is large, the channel information obtained by channel estimation is likely to expire, resulting in the degradation of wireless communication transmission quality. Compared with channel estimation, channel prediction makes up for the above shortcomings,...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a channel prediction system and method for an OFDM wireless communication system in view of the defect that it is difficult to predict the channel information of the OFDM wireless communication system in the prior art

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