Abstract
This invention discloses a communication method in coordinated multi-point transmission systems. Based on the Zadoff-Chu sequences, multiple training sequences are implemented, and the training sequences is a set of robust orthogonal training sequence (ROTS). Preamble signals that use the training sequence set can be transmitted from different base stations/relays at the same time. In the case with multiple mixed preamble signals, the mobile station can still use the received signal to estimate multiple carrier frequency offsets of the corresponding base stations/relays.