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Acquisition of Long Pseudo Code in Dsss Signal

By I. Anusha and M. TechT. Sarath Babu and M. Tech


ABSTRACT: Rapid pseudo-code is widely used in spread spectrum communication system, because it has a large data rate and a strong anti-jamming property. But it brings us large of difficulty to acquire it as its long period. A new method is proposed to solve this problem in this paper, which is based on the excellent correlation characteristics of the long pseudocode. The new method divides the local pn sequence into four subsequences, and then each of the sequence is overlapped and accumulated to form four new sequences. Through simple operation of addition, the four new sequences produce two combined sequences as the new reference sequences. At the same time, the received spread spectrum signal's sample rate is reduced to a quarter of the chip rate. Use the results to do correlation with the two new reference sequences to capture the synchronous pseudo-code. This method not only rapids the acquisition speed, but also improves the precision of frequency offset compensation. I

Year: 2014
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