Patent ID: 8861622

Claim:
A system for transmitting and receiving digital signals in a digital telecommunication system, the system comprising: a transmitter that transmits a transmit reference symbol as a part of a digital signal by using OFDM modulation, wherein an end synchronization repetition pattern in said transmit reference symbol is phase-shifted by 180° in relation to other synchronization repetition patterns in the reference symbol, said transmitter including means for preparing said reference symbol that includes a sequence of a plurality of synchronization repetition patterns, wherein each repetition pattern contains a predetermined number of samples and said end synchronization repetition pattern is positioned at the end of said plurality of synchronization repetition patterns; and a receiver configured to receive the digital signal that contains the reference symbol from the transmitter, said receiver being configured to exactly detect a timing of a correlation peak at the end of said reference symbol by performing a cross-correlation of said synchronization repetition patterns, which includes said end synchronization pattern.