Method for inhibiting OFDM system features

• Main Authors: JIN FANGLI, LIN KAIJIA, LIU HAO
• Format: Patent
• Language: Chinese; English
• Published: 15.09.2017
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

The invention belongs to the technical field of communication, and relates to a method for inhibiting OFDM system features. The common cyclic prefix used in an OFDM system not only brings unparalleled advantages to the system, but also inevitably exposes the parameter performance of the system, which becomes security vulnerability and is vulnerable to malicious attacks. According to the method provided by the invention, a random number of redundant subcarriers are added to each OFDM symbol, so that the length of the symbol randomly changes, and the periodicity of the cyclic prefix is changed, thereby hiding the exposed circulation stability features. In addition, due to the randomly changing number of the subcarriers, the interval magnitudes among the subcarriers similarly express randomly changing properties, which also protects the blind estimation of higher order cumulants of the number of the subcarriers and the intervals among the subcarriers. Meanwhile, the algorithm thought can be applied to an SC-FDE