Transmitting antenna selection method based on full-duplex bidirectional MIMO communication system

Abstract

The invention discloses a transmitting antenna selection method based on a full-duplex bidirectional MIMO communication system. The method includes the steps of establishing a system model based on the full-duplex bidirectional MIMO communication system and obtaining a system capacity equation of the full-duplex bidirectional MIMO communication system; constructing an optimizing problem taking antenna selection vectors as parameters and taking the system capacity equation after the antenna selection as an objective function; obtaining the lower bound, being the convex function of the antenna selection vectors, of the system capacity by means of the first-order Taylor expansion of logdet (.) function; and solving the antenna selection vectors by means of iteration, solving the convex optimization problem once during each iteration process until the optimized antenna selection vectors converge, and obtaining a final antenna selection scheme. The transmitting antenna selection method guarantees the system capacity, effectively reduces the algorithmic complexity, and has high practicality.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a method for selecting a transmitting antenna based on a full-duplex two-way MIMO communication system. Background technique [0002] The increasing demand for high-speed data rates and the shortage of spectrum resources have prompted the development of modern communication technologies to improve the utilization of wireless resources. Among many new technologies, full-duplex technology has attracted widespread attention because of its potential to double the utilization of spectrum resources. Compared with the traditional half-duplex technology (such as time division duplex and frequency division duplex), the full-duplex technology can simultaneously transmit uplink and downlink information on the same frequency resource. However, the capacity of the system cannot be ideally improved because the transmitted signal at the same end will generate strong self-interference to ...

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Problems solved by technology

[0004] The exhaustive search method is an antenna selection method commonly used in the prior art, which obtains the optimal antenna selection scheme by traversing all possible antenna subsets, but its algorithm complexity increases exponentially with the increase in the number of antennas. It is basically unrealizable when the number of antennas is relatively large, and the practicability is very poor

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