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本发明的背景为了防止信息的泄漏,信息应当编码或加密后再发射,而在接收端再对加过密的信息解密。为了准确地对加过密的信恩解密,发射端的加密和接收端的解密必须同步进行。迄今为止,同步信号或者经过非信息传输通道传输,或者作为导频经过信息通道传输。然而通过另外通道传输同步信息是不经济的。若导频信号通过信息通道传输,则允许信息信号占有的频带、即其动态范围将受到限制,致使信噪比降低或者使同步信号跳动,从而使实现加、解密之间精确的同步成为不可能。
BACKGROUND OF THE INVENTION In order to prevent the leakage of information, the information should be encoded or encrypted before it is transmitted, and the encrypted information is then decrypted at the receiving end. In order to accurately decrypt the encrypted over-secret, the sender’s encryption and the receiver’s decryption must be synchronized. To date, synchronization signals are either transmitted over non-information transmission channels or transmitted as pilots over information channels. However, it is uneconomical to transmit the synchronization information through another channel. If the pilot signal is transmitted through the information channel, the frequency band occupied by the information signal is allowed, that is, its dynamic range will be limited, resulting in a reduced signal-to-noise ratio or jitter of the synchronization signal, thus making it impossible to achieve accurate synchronization between addition and decryption .