| 摘要 |
An encryption method and decoding method for a digital transmission system, in which the digital data stream comprises an alternating sequence of training sequences and data symbols, and the training sequences are dynamically coded. At the receiving end, a decoding code (Vn) is generated by a code generator as a function of an encryption key (200). This decoding code is sent to a correlator, where it is mixed with the encryption code Vn extracted from the digital data stream. The correlator generates a correcting variable to compensate the offset in respect of time or frequency between the sender and receiver. Encryption is achieved through the alteration of the code used during the transmission.
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