Multi-carrier communicating method and device for TDD mode MIMO wireless communicating system

Abstract

The invention discloses a multi-carrier communicating method and device for a TDD mode MIMO wireless communicating system. The wireless communicating system comprises multiple channels of baseband signals, and each channel of baseband signals comprises two spatial-flow signals. The method uses a multi-carrier technique of frequency conversion, filtering, different-carrier antenna separation and identical-carrier transceiving antenna separation. An emitter can respectively convert each channel of two spatial-flow baseband signals into two spatial-flow single-carrier microwave frequency band signals through twice up frequency conversion and then combines the two spatial-flow single-carrier microwave frequency band signals into a single-channel orthogonal-polarized double-spatial-flow microwave frequency band signal which is sent by an emitting antenna. A receiver can filter signals received by all receiving antennas and then separate the signals into two spatial-flow single-carrier microwave frequency band signals through OMT, and the two spatial-flow single-carrier microwave frequency band signals are converted into baseband signals through twice down frequency conversion. The invention further provides a communicating device using the method. Compared with the prior art, the multi-carrier communicating method and device can effectively utilize rich frequency spectrum resources of millimeter waves to multiply improve the data transmitting throughput capacity of the wireless communicating system.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a multi-carrier communication method and device for a Time Division Duplex (Time Division Duplexing, TDD) mode multiple input multiple output (Multiple Input Multiple Output, MIMO) wireless communication system. Background technique [0002] The third-generation mobile communication technology such as WCDMA is a non-MIMO technology and works in Frequency Division Duplexing (FDD) mode. Its single-carrier channel bandwidth is 5 MHz, and a symbol transmission rate of 3.84 Mbps is realized. In order to improve the system capacity, the base station adopts a multi-carrier transmission method, but this technology is implemented in FDD mode. The working frequency band of the downlink transmission signal is 2110-2170MHz, and the working frequency band of the uplink reception signal: 1920-1980MHz. Its downlink transmission The frequency interval between the signa...

AI Technical Summary

Problems solved by technology

[0008] Purpose of the invention: low-frequency band (below 6GHz) wireless communication spectrum resources are increasingly scarce, widely used interference is very large, which seriously affects system performance, and even cannot work effectively. The present invention adopts frequency conversion to generate different frequency carriers, and utilizes filters, different carrier antennas The multi-carrier technology of separation and separation of transmitting and receiving antennas overcomes the problem of transmitting and receiving switching in TDD mode and the out-of-synchronization between multi-carriers, which causes the transmission signal of one carrier to leak to the receiving link of another carrier, making its receiving link saturated and unable to The problem of work is to effectively use the very rich frequency resources in the millimeter wave frequency band, double the data transmission throughput of the wireless communication system, and meet the current fourth-generation mobile communication technology LTE base station in the market. Backhaul and multi-channel video stream transmission up to 1Gbps The transmission rate requirements above

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