Error analysis and sequential error correction for despreading of parallel combined spread spectrum on missiles

DOI:	10.11809/bqzbgcxb2023.05.016
Keywords:	parallel combined spread spectrum; bit error rate; transmission performance; signal to noise ratio
Abstract:	The rocket projectile transmission system requires that the missile borne data link has the characteristics of high speed and strong anti interference within a certain bandwidth. Traditional spread spectrum technology has poor anti interference ability in the case of high data rates, and parallel combined spread spectrum can solve this problem very well. However, the despreading of parallel combined spread spectrum will result in a large number of bit errors in a low signal to noise ratio environment. According to the bit error rate (BER) formula of parallel combined spread spectrum, error analysis of parallel combined spread spectrum despreading is proposed for the first time, and the probability of correct despreading of different correlation peaks is obtained according to the analysis. On this basis, a successive despreading error correction method is proposed. Through the despreading error analysis, based on the maximum correlation peak value, the proposed method performs error correction according to the mapping relationship of the sender, and is applied to the missile borne transmission system. The simulation analysis shows that, compared with the traditional parallel combined spread spectrum technology, this method reduces the required signal to noise ratio of the parallel combined spread spectrum system by 2 dB.
Issue:	Vol. 44 No. 5 (2023)
Published:	2023-05-28
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