Pilot and channel estimation method for dual-polarization multi-antenna mobile satellite communication

Abstract

The invention discloses a pilot frequency and channel estimation method suitable for dual-polarization multi-antenna satellite mobile communication. The method includes the following steps: at the sending end, a code division multiple Use pilots or frequency division multiplex pilots. At the receiving end, first, use the received pilot signals in two time slots to obtain the least squares estimation of the channel response in the frequency domain; then, for the channel responses in the frequency domain of different antennas, discrete cosine transform is implemented respectively, and in the transform domain Perform noise reduction processing; finally, inverse discrete cosine transform is performed on the transformed domain channel response after noise reduction to obtain an estimated value of the frequency domain channel response. The pilot frequency and channel estimation method provided by the invention is compatible with the Land Long Term Evolution (LTE) mobile communication system, can completely eliminate the interference between multiple antennas, and obtains good estimation performance while reducing the computational complexity.

Description

technical field [0001] The invention relates to a pilot frequency design and a channel estimation algorithm of a wireless communication system, in particular to a pilot frequency and channel estimation method suitable for a dual-polarization multi-antenna satellite mobile communication system. Background technique [0002] With the growing demand for multimedia services, the traditional satellite mobile communication system can no longer meet the transmission rate requirements. The broadband satellite mobile communication system supports broadband multimedia information transmission and high-speed Internet access, and has gradually become a focus of attention. While the satellite mobile communication system is becoming broadband, a broadband mobile communication system fully integrated with it will be formed by drawing on the transmission technology standards of land mobile communication. With the development of the land mobile communication system, the LTE system will beco...

AI Technical Summary

Problems solved by technology

[0005] Technical problem: the purpose of this invention is to provide a pilot and channel estimation method suitable for dual-polarized multi-antenna mobile satellite communications. According to the characteristics of the satellite mobile communication channel, the minimum quadratic frequency in the multi-antenna system is solved by two time slot pilot structures. The inter-antenna interference problem caused by multiplication estimation, and further noise reduction processing is performed in the discrete cosine transform domain, and the noise reduction filter threshold is updated according to the current noise value, which avoids the matrix inversion problem in channel estimation with low complexity. and maintain high estimation accuracy

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