Time-frequency domain combined interpolation channel estimation method utilizing weighted virtual pilot frequency

Abstract

The invention belongs to the technical field of wireless communication, and discloses a time-frequency domain combined interpolation channel estimation method utilizing weighted virtual pilot frequency. The method comprises the steps of utilizing a channel frequency-domain characteristic value at a calculated scattered pilot frequency part to carry out linear interpolation for respectively calculating a time-domain direction channel frequency-domain characteristic value and a frequency-domain direction channel characteristic value at a weighted virtual pilot frequency part; utilizing channel maximum multipath time-delay and doppler frequency shift for calculating a weighting factor; utilizing a weighting function for carrying out weighted operation on the time-domain direction channel frequency-domain characteristic value and the frequency-domain direction channel characteristic value at the weighted virtual pilot frequency part, and obtaining time-domain direction channel frequency-domain characteristic values of all auxiliary pilot frequency; finally utilizing the time-domain direction channel frequency-domain characteristic values of the all auxiliary pilot frequency for carrying out frequency-domain direction wiener interpolation, and obtaining all received data channel frequency-domain characteristic values. According to the method provided by the invention, the accuracy of a channel estimation value is improved, and the method can be applied in a DVB-NGH system and other OFDM (Orthogonal Frequency Division Multiplexing) systems based on scattered pilot frequency.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a time-frequency domain joint interpolation channel estimation method using weighted virtual pilots. Background technique [0002] OFDM technology is widely used in DVB-NGH (Digital Video Broadcasting-Next Generation), DVB-T2 (Digital Video Broadcasting-Second Generation Terrestrial) due to its high transmission rate, high spectral efficiency, anti-multipath fading and intersymbol interference. , 3GPP LTE (3rd Generation Partnership Project Long Term Evolution) and other wireless communication systems have been widely used. In the OFDM system, the transmitted signal will be distorted to different degrees after passing through the wireless channel. In order to eliminate the influence of the channel on the signal, channel estimation and equalizer are needed. Among them, the accuracy of channel estimation plays a crucial role in the correct demodulation o...

AI Technical Summary

Problems solved by technology

[0003] To sum up, there are the following problems in the existing technology: the estimation performance of the existing time-frequency domain joint interpolation channel estimation algorithm decreases significantly in the channel environment with severe time-varying and multipath effects; the Wiener time-frequency domain joint interpolation channel estimation algorithm The implementation complexity of the algorithm and MMSE channel estimation algorithm is too high; the OFDM system pilot-assisted time-frequency domain interpolation weighted channel estimation method has limited application range for Doppler frequency offset and channel maximum multipath delay

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