Receiving apparatus and synchronising method for a digital telecommunication system
View Patent ↗A receiving apparatus for receiving signals in a digital telecommunication system and a synchronizing method for synchronizing the receiving apparatus. The receiving apparatus includes a receiver for receiving a reference symbol having at least two repetition patterns. One of the, repetition patterns is phase-shifted in relation to the other. The receiving apparatus is synchronized in the digital telecommunication system using the received reference symbol. The synchronization includes a cross correlation of at least one of two repetition patterns within a cross correlation window having a predetermined length. In this manner, the performance and the accuracy of a cross correlation peak detection can be enhanced for improved synchronization.
1. A receiving apparatus for receiving signals in a OFDM telecommunication system, comprising:
receiving means for receiving a reference symbol comprising a plurality of successive repetition patterns, wherein each of said repetition patterns comprises a number of samples, the number of samples being the same for each repetition pattern, and whereby one repetition pattern of said repetition patterns is phase-shifted in relation to the other repetition patterns; and
synchronizing means for performing a time and frequency synchronization of the receiving apparatus in the OFDM telecommunication system using said received reference symbol,
said synchronizing means comprising correlation means for correlating the plurality of repetition patterns within a correlation window having a predetermined length, and said synchronizing means including detection means that detects a phase of each of the plurality of repetition patterns in said reference symbol and uses the phase-shift information of said one repetition pattern in relation to the other repetition patterns in said reference symbol to detect a correlation peak which indicates the position of said one repetition pattern.
2. A method for synchronizing a receiving apparatus in a OFDM telecommunication system, comprising:
receiving a reference symbol comprising a plurality of successive repetition patterns, wherein each of said repetition patterns comprises a number of samples, the number of samples being the same for each repetition pattern, and whereby one repetition pattern of said repetition patterns is phase-shifted in relation to the other repetition patterns; and
synchronizing the receiving apparatus in time and frequency in the OFDM telecommunication system using said received reference symbol by correlating the plurality of repetition patterns within a correlation window having a predetermined length and by detecting a phase of each of the plurality of repetition patterns in said reference symbol and detecting a correlation peak which indicates the position of said one repetition pattern using the phase-shift information of said one repetition pattern in relation to the other repetition patterns in said reference symbol.
3. A receiving device for receiving OFDM signals transmitted from a transmitter device in an OFDM system, comprising:
receiving means for receiving a reference symbol comprising a sequence of a plurality of repetition patterns, wherein said reference symbol is transmitted from said transmitter device by using a multicarrier of said OFDM system and one repetition pattern of said sequence of plurality of repetition patterns is phase-shifted in relation to the other repetition patterns; and
synchronizing means for synchronizing the receiving apparatus in the OFDM system by detecting a phase of each of the plurality of repetition patterns in said reference symbol and correlating said plurality of repetition patterns to perform a time domain synchronization, and for detecting a frequency offset between said transmitter device and said receiver device in said OFDM system to perform a frequency synchronization by using said repetition patterns including said phase-shifted repetition pattern.
4. A method for synchronizing a receiving apparatus to OFDM signals transmitted from a transmitter device in an OFDM system, comprising:
receiving a reference symbol comprising a sequence of a plurality of repetition patterns, wherein said reference symbol is transmitted from said transmitter device by using a multicarrier of said OFDM system and one repetition pattern of said sequence of plurality of repetition patterns is phase-shifted in relation to the other repetition patterns; and
synchronizing the receiving apparatus in the OFDM system by detecting a phase of each of the plurality of repetition patterns in said reference symbol and correlating said plurality of repetition patterns to perform a time domain synchronization, and detecting a frequency offset between said transmitter device and said receiver device in said OFDM system to perform a frequency synchronization by using said successive repetition patterns including said phase-shifted repetition pattern.
5. A receiving device for receiving OFDM signals transmitted from a transmitter device in an OFDM system, comprising:
receiving means for receiving a reference symbol comprising a sequence of a plurality of repetition patterns, wherein said reference symbol is transmitted from said transmitter device by using a multicarrier of said OFDM system and one repetition pattern of said sequence of plurality of repetition patterns is phase-shifted in relation to the other repetition patterns; and
synchronizing means for synchronizing the receiving apparatus in the OFDM system by detecting a phase of each of the plurality of repetition patterns in said reference symbol and correlating said plurality of repetition patterns to perform a time domain synchronization, and for performing a frequency synchronization by detecting a frequency offset between said transmitter device and said receiver device in said OFDM system based on a phase change information introduced by said reference symbol.
6. A method for synchronizing a receiving apparatus to OFDM signals transmitted from a transmitter device in an OFDM system, comprising:
receiving a reference symbol comprising a sequence of a plurality of repetition patterns, wherein said reference symbol is transmitted from said transmitter device by using a multicarrier of said OFDM system and a last repetition pattern of said sequence of plurality of repetition patterns is phase-shifted in relation to the other repetition patterns; and
synchronizing the receiving apparatus in the OFDM system by detecting a phase of each of the plurality of repetition patterns in said reference symbol and correlating said plurality of repetition patterns to perform a time domain synchronization, and performing a frequency synchronization by detecting a frequency offset between said transmitter device and said receiver device in said OFDM system based on a phase change information introduced by said reference symbol.