Precoding Algorithm for Interference Suppression in Multi-Carrier Systems in Fast Time-Varying Scenarios

Abstract

The invention discloses a precoding algorithm used for suppressing interference in a multi-carrier system in a fast time-varying scene. The method comprises the steps of: deriving the precoding optimization criterion based on the SNR criterion to replace the traditional SINR optimization criterion; performing precoding transformation on the transmitted signal vector to obtain the data vector to be transmitted; performing precoding transformation on the obtained The data symbols are upsampled by N times, and then circularly convolved with the pulse shaping filter to obtain the final output. The precoding algorithm based on the SNR criterion adopted in the present invention has low complexity, and its computational complexity is basically the same as that of the zero-forcing precoding algorithm; the precoding algorithm based on the SNR criterion is designed with noise in mind, especially at low Under the condition of signal-to-noise ratio, its performance is significantly better than zero-forcing linear precoding algorithm. The original data vectors are not orthogonal to each other, and the matrices obtained after precoding transformation are orthogonal to each other. After such a precoding operation, the orthogonality between the subcarriers of the GFDM system can be improved and the intercarrier interference can be reduced.

Description

technical field [0001] The invention relates to a precoding algorithm for suppressing interference in a multi-carrier system in a fast time-varying scene Background technique [0002] With the further improvement of the social development level, people put forward higher requirements for the capacity and business types of future wireless communications. The mobile Internet that supports ultra-high speed and high traffic density, the Internet of Things that supports a large number of terminal devices and meets more stringent delay and reliability requirements have become the two main driving forces for the development of mobile communications today. They will make mobile communications The technology expands to a wider range of industries and fields, bringing users a better experience. With the popularization of smart terminals and the growth of high-speed data services, future wireless communication systems need higher system capacity and spectrum utilization to meet rapidl...

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