| Orthogonal frequency division multiplexing (OFDM) technology will become the most important communication technology of the fourth-generation mobile communications (4G). OFDM technology possesses the characteristics of anti-multipath interference, anti-frequency selective fading strongly, and very high frequency spectrum utilization. This paper firstly makes all readers understand OFDM in the principles and key technologies through discussing every detail of the OFDM technology.Based on the OFDM signal generation and channel spectrum analysis of the law, the OFDM signal is given a strong interference by selecting a small disturbance in power, mainly for military applications during the war to the enemy who using OFDM to communicate to interfere the original signal. Discussing the principle of multi-tone signals generated in the OFDM system by adding multi-tone signals to OFDM system, as well as interference effects of the multi-tone signals on the OFDM system. The simulation proves the correctness of theoretical analysis and it is applied to practice based on the results of simulation further.The innovation of this article is to give an effective way of interference– the multi-tone interference in the OFDM system, and theoretical analysis and simulation of a multi-tone interference with the characteristics of high-performance contrast to three traditional interfering ways which are broadband interference, some of the band interference and pulse interference, that is the same as interference in the power in the OFDM system so that having the maximum error rate. |
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