Cognitive home network access method for large-scale MIMO (multiple input multiple output) system

Abstract

The invention provides a cognitive home network access method for a large-scale MIMO (multiple input multiple output) system, and belongs to the technical field of cognitive radio of wireless communication. The large-scale MIMO system comprises an authorization macrocell base station, K authorization macrocell users, S cognitive home base stations corresponding to S cognitive home networks, a communication channel between the authorization macrocell base stations and users, cognitive home base station detecting communication channels and a communication channel between the cognitive home base stations. The cognitive home network access method for the large-scale MIMO system comprises the following steps of dynamically grouping the cognitive home base stations according to the state information of the communication channel between the cognitive home base stations; and performing weighting on a detection result according to a grouping condition, the confidence coefficient of the cognitive home base stations and the average signal-to-noise ratio of the detecting communication channels so as to obtain a final judgment result. Cognitive home base station distribution conditions which have large influences on macrocells are considered sufficiently, the confidence factor of the cognitive home base station detecting result is utilized effectively, and the frequency spectrum sharing probability and the handling capacity of a cognitive home network layer are improved on the premise that influences on the handling capacity of the macrocells are low.

Description

technical field [0001] The invention relates to a method for accessing a cognitive home network of a massive MIMO system, and belongs to the technical field of wireless communication cognitive radio. Background technique [0002] Massive MIMO is an emerging technology facing future 5G mobile communication requirements, which achieves excellent precoding and beamforming capabilities through large-scale antenna arrays installed in licensed macrocell base stations. Since the base station needs to obtain partial or complete channel state information when designing precoding in MIMO systems, and the number of base station antennas in massive MIMO systems is huge, channel reciprocity is usually used to obtain channel state information, that is, time division duplexing is used. system. [0003] On the other hand, with the advancement of science and technology and the rapid development of wireless communication technology, wireless spectrum resources are becoming more and more scar...

AI Technical Summary

Problems solved by technology

[0004] The cognitive home network access scheme in the existing frequency-division duplex-based cognitive massive MIMO system needs to occupy two frequency band resources and cannot take advantage of the channel reciprocity feature; while the cognitive home network in the time-division duplex-based massive MIMO system Most of the network access solutions are fixed access solutions

Jakob Hoydis et al., Germany (see J.Hoydis, K.Hosseini, S.Brink and M.Debbah, "Making Smart Use of Excess Antennas: Massive MIMO, Small Cells, and TDD," Bell Labs Technical Journal, vol.18, issue 2, pp.5-21, 2013.) proposed two access schemes based on time division duplex massive MIMO system, one is time division duplex access scheme, the other is reverse time division duplex access However, none of them considered the distribution of cognitive home networks and the cooperative detection between cognitive home base stations that have a greater impact on authorized macrocell base stations and authorized macrocell users.

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