Precoding technique in massive MIMO network based on time inversion

Abstract

The invention relates to a precoding technique in a massive MIMO network based on time inversion, specifically relates to the fusion and improvement of the time inversion technique and the precoding technique in the massive MIMO network, and achieves the purpose of interference inhibition. The channel optimization of the technique is performed on the basis of the time inversion technique, and thetechnique achieves the energy gathering through the spatiotemporal focusing of the time inversion technique. The improvement is achieved on the basis of the zero-forcing precoding technique, and the technique reduces the inter-user interference and co-channel interference in the massive MIMO network through the zero-forcing precoding technique in a multi-path environment, thereby achieving the interference inhibition. A receiving end antenna can obtain the channel state information of a multi-path channel at a base station antenna end through the channel detection, and the up-sampling is performed on the base station antenna so as to reduce the signal transmission rate. The inter-user interference and co-channel interference are reduced under the condition of the multi-path channel throughthe zero-forcing precoding technique, so the technique provided by the invention can enable the mean bit error rate to be reduced, and remarkably improves the SINR (Signal to Interference plus NoiseRatio) and the achievable rate of the massive MIMO system.

Description

technical field [0001] The invention relates to the field of interference suppression in MIMO networks, in particular to a precoding technology based on time inversion in massive MIMO networks. Background technique [0002] With the continuous advancement of wireless technology, people's requirements for information transmission rate and data accuracy are also increasing. At the same time, the rapid increase in the number of mobile terminals has led to a shortage of limited frequency resources. The input-multiple-output system can no longer meet the above requirements. In order to meet this requirement, massive MIMO technology was proposed. Massive MIMO technology refers to a communication method in which hundreds of antennas are installed on the side of the base station and serve many user terminals at the same time and frequency point. , compared with the traditional MIMO technology, it has higher spectrum utilization and energy efficiency. In the future cell network, mass...

AI Technical Summary

Problems solved by technology

The method of linearly processing signals on the base station side is called linear precoding, which mainly includes: zero-forcing linear precoding, minimum mean square error linear precoding, matched filter precoding, etc. Non-linear precoding is to add design A good precoding vector is used to achieve precoding methods that suppress interference between users, which mainly include: dirty paper coding, THP, etc. In general, the performance of nonlinear precoding is better than that of linear precoding, although the current precoding technology can be certain Inter-user interference and co-channel interference can be reduced to a certain extent, but the complexity is high due to its precoding matrix. Future and current research is also reducing complexity.

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