Synchronizing method for quadrature frequency division multiple access system
An orthogonal frequency division multiple access and coarse synchronization technology, applied in multi-frequency code systems, signal channels, etc., can solve problems such as limitations, sacrifice of spectrum utilization, and high complexity, and achieve low complexity, high spectrum utilization, and Carrier Frequency Offset Estimation Accurate Effect
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[0044] In a preferred embodiment of the invention, the synchronization sequence is described in the form of an Additive Time Domain Training Sequence (ATTS). figure 1A schematic diagram of the generation of the ATTS sequence according to the present invention is shown. When the number of subcarriers available in the OFDMA system is not equal to the length of IDFT, a Gold code is inserted at a specific frequency point in the frequency domain. A suggested method is to first generate a Gold code with half the order of the IDFT modulator , and then insert these Gold codes into the symmetrical frequency points on both sides of the IDFT center frequency point in turn, where the zero frequency point and other frequency points that have not been inserted into the Gold code value are zero-inserted, and the sequence is converted into a time-domain signal by IDFT , as the ATTS sequence after weighting, and when the number of available subcarriers of the OFDM system is equal to the length...
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