Multi-cell Massive MIMO Interference Cancellation Method Based on Antenna Selection and Interference Alignment

Abstract

The invention discloses a multi-cell massive MIMO interference elimination method based on antenna selection and interference alignment, and belongs to the technical field of mobile wireless communication. The present invention includes: the base station obtains the channel matrix and calculates the norms of the column vectors corresponding to each transmitting antenna respectively, selects the first Ns antennas with the largest norms as active antennas, and closes other antennas; based on the column vectors corresponding to the active antennas As a new channel matrix and calculate the interference alignment precoding vector of each base station, according to the interference alignment precoding vector and the new channel matrix, calculate the receiving zero-forcing vector of the receiving end and allocate the transmission power of each data stream accordingly, and then based on the transmission The power updates the receiving zero-forcing vector. Finally, the current base station generates and transmits the corresponding sending data of the receiving end based on its interference alignment precoding vector, the current receiving zero-forcing vector, and the sending power of each data stream. The implementation of the invention can reduce the computational complexity, increase the transmission rate and reduce the bit error rate.

Description

technical field [0001] The invention belongs to the technical field of mobile wireless communication, in particular to a multi-cell massive MIMO interference elimination method based on antenna selection and interference alignment Background technique [0002] Massive MIMO technology can significantly improve the spectral efficiency and energy efficiency of the system by configuring a large number of antennas at the base station. When the number of base station antennas tends to be infinite, the channel matrices between different users tend to be orthogonal, thereby eliminating inter-user interference. and inter-cell interference, which has received extensive research and attention. However, the number of antennas in the actual situation cannot be infinite, and the channel matrix between different users is not ideally orthogonal, that is, inter-user interference still exists, especially for cell edge users. [0003] Interference alignment technology is to use the known chan...

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Problems solved by technology

If power allocation is not considered, that is, equal power allocation, the effective channel gain of each transmitted data stream will be seriously unbalanced, and it is difficult to optimize the performance of the system.

The paper "Interference Alignment Based On Antenna Selection For MassiveMIMO System" (Zhiyuan Shi, Xiaoopeng Zhu, Yifeng Zhao, Lianfen Huang, Computer Science & Education (ICCSE), 2015 10th International Conference on, 22-24July2015, pp.606-610) in Massive MIMO The system jointly uses antenna selection and interference alignment technology to eliminate interference, but does not consider the issue of power allocation, and the complexity of the antenna selection algorithm is high, and there is still a large room for improvement in system performance

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