Research on a Communication Method Based on Spread Spectrum Technology

Zhong, Xiaolei; Xin, Wu

doi:10.1088/1755-1315/252/4/042070

Cited by 1 publication

(1 citation statement)

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“…Each sub-carrier uses parallel transmission, which converts high-speed data signals into parallel low-speed subdata streams. The frequency spectrum of each sub-carrier is only 1/N of the signal bandwidth, and parallel data stream also ensures that the sub-carriers maintain orthogonality within the OFDM period T. OFDM uses discrete Fourier transform and its inverse transform to solve the problem of generating multiple orthogonal sub-carriers and recovering the original signal from the sub-carriers, which greatly reduces the complexity of the multi-carrier transmission system [21], [28]- [29]. The modulation principle is shown in Figure 6.…”

Section: Ofdm Modulation Principlementioning

confidence: 99%

Performance Evaluation of a Tactical Data-Link System Based on MSK and 16QAM

Zhao

Zhai

et al. 2021

IEEE Access

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Tactical data links are becoming more widely used in the military, as they can greatly improve the efficiency of various combat units. Such tactical data links must be able to transmit large volumes of data at high speed in complex communication environments while ensuring reliability. This paper studies the influence of 16-ary Quadrature Amplitude Modulation (16QAM) and Minimum Frequency-shift Keying(MSK) modulation on the transmission performance of data chain system. The simulation results show that 16QAM modulation can meet the requirements of tactical data link system for BER and data transmission rate, and the technical complexity is in the middle; the system BER of MSK modulation is lower, and a large number of data transmission can be realized at high speed. When the SNR reaches 50dB, the BER of MSK modulation can be reduced to 10 -4 order of magnitude, which is better than Quadrature Phase Shift Keying (QPSK) modulation, that is, the data chain system based on MSK modulation can meet the transmission requirements of data chain when the signal-to-noise ratio is large.

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Section: Ofdm Modulation Principlementioning

confidence: 99%