| 摘要 |
A method for generating a cyclic training sequence and a communication method and system using the cyclic training sequence are disclosed. The cyclic training sequence includes a first training symbol and a second training symbol sequentially, the said first training symbol including a first CP and a first information block sequentially and the said second training symbol including a second CP and a second information block sequentially, and the method for generating a cyclic training sequence is characterized in that the said method comprises the following steps: the first step, generating randomly the first information block with the length N, wherein N is a natural number; the second step, copying the last L samples of the first information block to the beginning of the block as the said first CP, wherein L is a natural number less than N; the third step, generating the second information block with the length N by the first information block of the first training symbol in a circle manner in which the last d samples of the first information block are shifted to the position before the rest (N-d) samples and the N samples thus rearranged forms the second information block, wherein, the corresponding relation between the said first and second information blocks is the structure characteristic of the said cyclic training sequence, and d is 0 or any natural number less than N; and the fourth step, copying the last L samples of the second information block to the beginning of the block as the said second CP to form the integreted cyclic training sequence. The said method and system can realize high precise downlink synchronization and reduce the interference and distortion between different users because of the overlap of multi-user training sequence so as to guarantee that every user can have stable and reliable uplink synchronization. |
