Frame synchronization method for full phase OFDM system

Abstract

The invention relates to the mobile communication technical field, in particular to the frame synchronization technology of an all-phase orthogonal frequency division multiplexing (OFDM) system. In order to provide a method for obtaining accurate frame synchronization in the all-phase OFDM system, the invention adopts a technical proposal which comprises the following steps in sequence: firstly, an all-phase FFT orthogonal frequency division multiplexing (OFDM) system is established; later, auto-correlation frame synchronization algorithm is carried out on the basis of the all-phase FFT orthogonal frequency division multiplexing; then starting: step one, initializing synchronization position, maintaining and updating the process; step two, judging whether the detection is successful and the detection result is recorded according to an auto-correlation detection strategy; step three, doing judgment when updating the process; step four, replacing the original synchronization position with a new synchronization position or retaining the original synchronization position in a frame interval Ts; step five, outputting frame synchronization information and then returning to the step two to continue; the invention is mainly used in the digital video signal processing.

Description

Technical field [0001] The present invention relates to the field of mobile communication technology, in particular to OFDM synchronization technology, a key technology in next-generation mobile communication, and specifically to the frame synchronization technology of an all-phase orthogonal frequency division multiplexing OFDM system. Background technique [0002] 1. Basic principles of OFDM technology [0003] OFDM is a high-speed transmission technology suitable for wireless environments. In addition to wireless local area network standards (IEEE802.11a, HiperLAN / 2), it is also used in broadband wireless access (BWA). [0004] figure 1 It is a block diagram of the principle of OFDM system applied in mobile communication. figure 2 It is its realization diagram. [0005] At the transmitting end, the original data is firstly encoded and interleaved, and then serial-to-parallel conversion is performed. One signal is divided into N channels in parallel, and the data is modulate...

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Problems solved by technology

[0012] Due to the insertion of the cyclic prefix, the OFDM system has relatively low requirements for symbol timing and time synchronization, that is, as long as the initial moment of the OFDM symbol falls within the cyclic prefix, the maximum multipath delay will not cause intersymbol interference .However, if the symbol timing part is at the optimal time, it will reduce the ability of the system to multipath delay extension, so in practice, the timing synchronization error of the symbol should also be reduced.

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