Limiting feedback method and device for large-scale antenna system

Abstract

The invention provides a limiting feedback method and device for a large-scale antenna system. The method comprises the steps that a receiving terminal feeds back low-dimensional channel status information obtained through a principal component analytical method to a transmitting terminal in each short cycle; the receiving terminal continues channel estimation, obtains a dimensionality reduction matrix through the principal component analytical method and feeds back the dimensionality reduction matrix to the transmitting terminal in each long cycle; the transmitting terminal receives the dimensionality reduction matrix fed back by the receiving terminal at the beginning of each long cycle, multiplies a transpose of the dimensionality reduction matrix and the low-dimensional channel information and restores high-dimensional status information; the transmitting terminal receives the low-dimensional channel status information fed back by the receiving terminal in each short cycle. By means of the method, the principal component analytical method is adopted to conduct dimensionality reduction treatment on the high-dimensional channel status information with spatial relativity so as to lower the compression ratio; the receiving terminal only needs to feed back corresponding codon serial numbers, so that the burden of the receiving terminal is mitigated; the transmitting terminal only needs to restore the high-dimensional channel status information, so that the processing complexity of the transmitting terminal is lowered.

Description

technical field [0001] The present application relates to the technical field of wireless communication, in particular to a limited feedback method and device for a large-scale antenna system. Background technique [0002] MIMO (Multi-input Multi-output) technology is one of the research hotspots in the field of wireless communication in recent years. It can use multiple antennas at the transmitting end to send signals independently, and at the same time use multiple antennas at the receiving end to receive and transmit signals. Restore the original information. Massive MIMO adopts the MIMO technology of massive antenna array at the receiving end, which can make full use of the spatial degree of freedom to improve the space division multiplexing gain. [0003] The realization of space division multiplexing gain depends on the receiving end being familiar with downlink channel state information (Channel State Information, CSI). In a Time Division Duplexing (TDD) system, sig...

AI Technical Summary

Problems solved by technology

Different from the limited feedback method based on the quantization codebook, the analog feedback requires the receiving end to first send the uplink sounding reference signal (Sounding Reference Signal, SRS), and the receiving end also needs to use the SRS to estimate the state of the uplink channel, which gives the receiving end and the receiving end extra burden

Secondly, after receiving the low-dimensional channel state information fed back, the receiving end needs to solve an optimization problem to restore the high-dimensional channel information, which increases the processing complexity.

In addition, in the existing compressed sensing technology, although the uplink feedback burden can be reduced to a certain extent, the compression ratio cannot be too low

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