A Signal Modulation Method of Direct Sequence Spread Spectrum Based on Modulated m-sequence

Lingchuan ZENG; Yan BAI; Xiaochun LU; Hong YUAN; Chengeng SU; Xiaojing WU

doi:10.11999/JEIT200600

Volume 43 Issue 8

Aug. 2021

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Article Navigation > Journal of Electronics & Information Technology > 2021 > 43(8): 2156-2164

Lingchuan ZENG, Yan BAI, Xiaochun LU, Hong YUAN, Chengeng SU, Xiaojing WU. A Signal Modulation Method of Direct Sequence Spread Spectrum Based on Modulated m-sequence[J]. Journal of Electronics & Information Technology, 2021, 43(8): 2156-2164. doi: 10.11999/JEIT200600

Citation:

Lingchuan ZENG, Yan BAI, Xiaochun LU, Hong YUAN, Chengeng SU, Xiaojing WU. A Signal Modulation Method of Direct Sequence Spread Spectrum Based on Modulated m-sequence[J]. Journal of Electronics & Information Technology, 2021, 43(8): 2156-2164. doi: 10.11999/JEIT200600

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A Signal Modulation Method of Direct Sequence Spread Spectrum Based on Modulated m-sequence

doi: 10.11999/JEIT200600

Lingchuan ZENG^{1, 2, 3},
Yan BAI^{2
,
,},
Xiaochun LU²,
Hong YUAN³,
Chengeng SU⁴,
Xiaojing WU³

1.
School of Electronic,Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 101408, China
2.
Nation Time Service Center, Chinese Academy of Sciences, Xi’an 710600, China
3.
Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
4.
Beijing Institute of Tracking and Telecommunications Technology, Beijing 100094, China

Funds: General Fund of National Natural Science of China (11873009)

Received Date: 2020-07-21
Rev Recd Date: 2021-02-04

Available Online: 2021-03-01

Publish Date: 2021-08-10

Abstract

Abstract

To raise the spectrum utilization, a modulation and demodulation method called modulated Direct Sequence Spread Spectrum (m-DSSS) is proposed, which assign the period of m-sequence to be equal to the integer multiple of data bit. Firstly, the feasibility of m-DSSS signal acquisition is verified by numerical simulation results of correlation. Then, according to the permutation of information bits, a multi-channel signal modulation and demodulation method for m-DSSS is designed, and the mathematical model reacting the anti-interference ability of passing through the additive Gaussian white noise channel is established. Finally, the simulation and contrast test are carried out with Codes Shift Keying (CSK) modulation under the same spectrum utilization. The simulation results show that m-DSSS signal not only has lower side peak than CSK signal but also can assist signal acquisition by judging polarity when BPSK modulation is adopted. When bit error rate is better than 1e-3, m-DSSS signal has more than 2 dB advantage than CSK signal, which verifies the feasibility of m-DSSS used in DSSS system.
- Direct Sequence Spread Spectrum (DSSS),
- Pseudo-random sequence,
- Modulated m-sequence,
- Signal modulation

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References(19)

References

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