Method for improving timing synchronization of OFDM (orthogonal frequency division multiplexing) system under multipath channel
A system timing and timing synchronization technology, applied in multi-frequency code systems and other directions, can solve the problems of reducing system performance, OFDM system timing synchronization interference, etc., and achieve the effect of improving system performance, low complexity, and conducive to hardware implementation
Active Publication Date: 2013-06-12
SOI MICRO CO LTD
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Problems solved by technology
[0005] The present invention aims at the problem that the multipath environment brings interference to OFDM system timing synchronization, thereby reducing system performance, and provides an improved method for OFDM system timing synchronization under multipath channels
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[0027] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.
[0028] figure 1 It is a flow chart realized by an improved method for timing synchronization of an OFDM system under a multipath channel according to an embodiment of the present invention, such as figure 1 As shown, the method includes:
[0029] Step 101: Calculate the preamble sequence of the signal at the receiving end of the communication system and the cross-correlation value corr of the signal sent from the sending end to the receiving end;
[0030] The cross-correlation value of the preamble sequence and the receiving end signal in the step 101 refers to the result of local correlation between the preamble sequence known by the receiving end and the signal received by the receiving end, and the signal receiv...
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The invention relates to a method for improving timing synchronization of an OFDM (orthogonal frequency division multiplexing) system under a multipath channel, which comprises the following steps: computing the correlation values of preamble sequences of signals at the receiving end of a communication system and the signals sent to the receiving end by the transmitting end; searching for the correlation values of the signals at the receiving end in sequence, and determining the first two preamble sequences; windowing to search for the subsequent preamble sequences on the basis of finding thefirst two preamble sequences, and re-computing all the correlation values greater than a timing synchronization threshold in the window to obtain new correlation values; and determining the windowingposition of timing synchronization according to the new correlation values. By adopting the method, the problem of reduced system performance caused by wrong judgment of correlation peaks due to the multipath channel can be effectively solved.
Description
technical field [0001] The invention relates to the technical field of synchronization, in particular to an improved method for timing synchronization of an OFDM system under multi-path channels, and belongs to the technical field of data transmission. Background technique [0002] Synchronization technology is a practical problem that any communication system needs to solve, and its performance is directly related to the performance of the entire communication system. Without accurate synchronization, reliable data transmission is impossible. Specifically, synchronization can be divided into timing synchronization, sampling synchronization and carrier synchronization. Among them, the purpose of timing synchronization is to determine the start and end moments of each symbol, and then achieve fast synchronization; sampling synchronization is to eliminate the deviation caused by sampling at the sending end and receiving end; carrier synchronization is to ensure that the recei...
Claims
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IPC IPC(8): H04L27/26
Inventor 黑勇李春阳乔树山
Owner SOI MICRO CO LTD