Multiple-input multiple-output (MIMO)-orthogonal frequency division multiplexing (OFDM) cognitive radio communication method

Abstract

The invention provides a multiple-input multiple-output (MIMO)-orthogonal frequency division multiplexing (OFDM) cognitive radio communication method. A radio-frequency module outputs intermediate-frequency data which is used for spectrum detection to determine whether a spectrum is an idle spectrum or not, if so, optimum spectrum analysis and channel estimation are conducted to determine the characteristic of the spectrum, then optimum spectrum allocation is conducted to determine routing lines for information transmission, and when a master user requires to use the current frequency band, other routing lines are selected and used for data transmission; a cognitive module transmits a control signal to the radio-frequency module, wherein the control signal is used for setting the parameters of the secondary frequency variation of the radio-frequency module and setting the communication frequency band of a data transmission module; and each cognitive user has two transmitting and receiving antennas which are used for transmitting and receiving data, and signaling information is transmitted between the cognitive module and the data transmission module and is used for selecting transmission lines and proper transmission power. The method has the advantages that the spectrum utilization ratio is improved, the channel switching times are reduced, the data transmission quality is improved and the goal of stably transmitting cognitive data to the cognitive users is achieved.

Description

technical field [0001] The present invention relates to a cognitive radio communication method, in particular to a MIMO-OFDM cognitive radio communication method. Background technique [0002] With the rapid development of wireless communication technology and communication services, wireless networks are facing a contradiction between limited spectrum resources and increasing demand for spectrum resources by various services. Cognitive radio, as an intelligent wireless communication system, can perceive the surrounding wireless environment, and through the analysis of the wireless environment, change some working parameters accordingly to adapt to the environment in real time, so as to improve spectrum utilization and alleviate spectrum resource shortage The purpose is to open up a new way to effectively solve the contradiction between the shortage of spectrum resources and the low utilization rate of spectrum. MIMO-OFDM technology is currently recognized as a transmission...

AI Technical Summary

Problems solved by technology

[0004] Although there have been many research reports on cognitive radio communication technology based on MIMO-OFDM technology, on the one hand, not only have they not elaborated on a complete cognitive radio communication technology based on MIMO-OFDM technology, but they are all based on MIMO-OFDM technology. Advantages Improve the performance of some key technologies in cognitive radio; on the other hand, both spectrum detection and cognitive user data transmission share the same antenna, which cannot achieve the purpose of quickly detecting frequency band utilization and efficiently transmitting cognitive user data

Images