Full-duplex orthogonal frequency division communication method for large-scale antenna system

Abstract

The invention discloses a full-duplex orthogonal frequency division communication method for a large-scale antenna system. The method mainly solves the problems that in the system, in a traditional FDM mode, the amount of feedback information is large, and a traditional TDM mode is difficult to adapt to the fast change characteristic of a channel. The method comprises the steps that (1) a transmission band of a signal is divided into a plurality of mutually orthogonal subcarriers by utilizing the OFDM thought; (2) the divided subcarriers are distributed to uplinks and downlinks in a specific mode; (3) terminals send pilot signals in the distributed uplinks, and a base station acquires channel state information at all the subcarriers according to received pilot signals; (4) on the basis of the channel state information, the base station and the terminals respectively transmit data on the distributed downlink subcarriers and uplink subcarriers. The full-duplex orthogonal frequency division communication method has the advantages of no feedback, simultaneous receiving and sending, low delay and large coverage, thereby being capable of being used for full-duplex communication of the large-scale antenna system in a high-speed mobile scenario.

Description

technical field [0001] The invention belongs to the field of wireless communication, in particular to a full-duplex communication method, which can be used in a large-scale antenna communication system. Background technique [0002] The development of multiple-input multiple-output MIMO technology has become more and more mature, and it has been successfully applied in the wireless broadband standard of mobile communication Long Term Evolution (LTE) technology. For example, in the LTE standard, a base station can be configured with up to 8 antennas. Analysis and experimental data show that configuring multiple antennas on the transmitter or receiver can provide more propagation links for the signal, and improve the transmission rate and link reliability. The concept of a large-scale antenna system goes beyond the traditional MIMO system. This system will consider that the base station is equipped with more small antennas with low power transmission, generally hundreds or eve...

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Problems solved by technology

However, for the time division duplex mode, the basic premise of the symmetry of the uplink channel and the downlink channel must be guaranteed, that is, the channel state information of the uplink and the downlink are the same at the same time or in a short period of time. The working mode of the time division duplex system is limited to the half duplex mode, and its channel utilization rate is relatively low compared with the frequency division duplex mode; and because the time division duplex mode must have protection between the uplink and downlink data transmission Time interval, which leads to a large delay in the transmission of every two consecutive links in the same direction, which greatly limits the coverage of the system and is not suitable for high-speed mobile communication scenarios

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