New OFDM time, frequency synchronization method
A frequency synchronization and time synchronization technology, applied in synchronization devices, multi-carrier systems, digital transmission systems, etc., can solve the problems of low energy efficiency of transmitted data, insignificant peak correlation at the receiving end, and decreased data transmission efficiency, and achieve easy time Synchronized with frequency, excellent performance, and the effect of improving energy efficiency
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[0069] The implementation steps of this patent under a specific OFDM configuration are given below. It should be noted that the parameters in the following examples do not affect the generality of this patent.
[0070] Let the OFDM useful symbol length be N=4096, and the guard interval length be N g =512. Taking ρ=0.5 means that the energy of the training sequence in the guard interval accounts for 50% of the total energy. The PN sequence is selected as the period N PN = 31 m-sequence, denoted as PN[i]i∈[0, 30], then the number of repetitions of m-sequence in the training sequence is L=N g / N PN =512 / 31=17.
[0071] The transmitter repeats the m-sequence 17 times in a row according to Formula 4 (the last m-sequence will be truncated) to form a training sequence, and performs point-to-point weighted superposition with the original OFDM data according to Formula 5 before transmitting it.
[0072] The receiving end first performs rough time synchronization according to Form...
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