Abstract
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 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-4</sup> 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.
Highlights
Tactical data links are systems that transmit, exchange, and process tactical information in real time according to standard message formats and communication protocols [1], [2]
The communication bandwidth used in tactical data links is several hundred megahertz, and so cyclic code-shift keying (CCSK) soft spread spectrum technology was used in the simulation
Through the analysis of the simulation results based on 16-QAM, it can be seen that in order to achieve high-speed data transmission, the 16-QAM modulation based on ONE-WAY COUPLED MAPPING LATTICE MODEL (OCML) sequence has significant advantages, which can meet the requirements of the tactical data link system for bit error rate, and meet the requirements of the system for data transmission rate, and the technical complexity is in the middle; Through the analysis of the simulation results based on Minimum frequency-shift keying (MSK) modulation, it can be seen that when the signalto-noise ratio (SNR) reached 50 dB, the BER of the MSK modulation-based system can be reduced by 4–10 orders of magnitude, which is better than Quadrature Phase Shift Keying (QPSK) modulation
Summary
Tactical data links are systems that transmit, exchange, and process tactical information in real time according to standard message formats and communication protocols [1], [2]. In this system, the technologies used are RS coding, interleaving coding, soft spread spectrum CCSK technology, 16-QAM modulation and demodulation technology, frequency hopping technology, and orthogonal frequency division multiplexing (OFDM) technology. When the information transmission rate and system bandwidth are the same, CCSK uses coding to reduce the symbol rate and longer spreading sequences to improve signal detectability [23]. C. THE PRINCIPLE OF ONE-WAY COUPLED MAPPING LATTICE MODEL (OCML) At present, most of the scrambling code sequences used in tactical data link communication are pseudo-random. This paper proposes to use OCML spatiotemporal chaotic sequence to improve the CCSK spread-spectrum coding module to enhance the autocorrelation and security of its base sequence.
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