Enhanced data link transmission waveform design method based on Link16

Abstract

The invention belongs to the technical field of communication, and particularly relates to an enhanced data link transmission waveform design method based on Link16. An enhanced data link transmissionwaveform is designed on the basis of Link16, transmission link design of a low-speed mode, a medium-speed mode and a high-speed mode is given, the highest transmission rate can reach 4 Mbps, the enhanced waveform design can adopt the optimal rate mode for transmission according to transmission service requirements and channel quality evaluation conditions, and the joint optimization of system transmission performance and capacity is realized; the transmission rate of the enhanced waveform is at least three times higher than that of the conventional Link16 waveform under the same bit error rate transmission performance in an interference-free environment, and the capability of resisting multi-tone interference and partial band interference is about 40dB higher than that of the conventionalwaveform under the interference environment when the rate of the enhanced waveform does not exceed 1Mbps. Compared with a conventional Link16 waveform, the enhanced data link transmission waveform design has remarkable advantages, and the enhanced data link transmission waveform design is easy to implement and has high application value.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a method for designing a transmission waveform of a Link16-based enhanced data link. Background technique [0002] In wireless communication electronic countermeasures, the data link has gradually become an indispensable information technology on the battlefield. It covers communication, navigation and identification and other technical means, and is one of the key elements in the information-based coordinated combat system. Secure communication, information acquisition and intelligent processing are closely connected to provide support for various business needs of the command department; the Link16 data link, also known as the Joint Tactical Information Distribution System (JTIDS), is a developed by the United States. A tactical data link that supports a wide range of services such as electronic warfare, identification of friend or foe, precise positioning, an...

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Problems solved by technology

[0004] 1) Adopt partitioned cyclic code shift keying (partitioned cyclic code shift keying, PCCSK) spread spectrum coding technology, so that the system supports multiple data rates, which can improve the spectrum efficiency of the system, thereby improving the network capacity, and PCCSK uses Multi-network capability is added to RS coding, and the transmission rate is 57.6kbps-350.2kbps, but the coding technology of this scheme relies on the code selection algorithm, and the code selection algorithm may cause the number of bits in the RS symbol to be inconsistent with the number of bits sent ;

[0005] 2) Low-density parity-check (LDPC) codec is used instead of RS codec in Link16. This scheme is significantly better than traditional Link16 in terms of random and burst errors. When the BER is 10 -4 , the improved performance is about 4 to 6dB better than the traditional Link16, and the anti-interference ability has been improved to a certain extent; however, Link16 requires a high speed in signal processing, and most LDPC code encoding and decoding algorithms have high time complexity degree, this solution requires more real-time analysis research;

[0007] 4) Other 32-bit orthogonal codes are used instead of CCSK spreading codes, so that the non-orthogonal codes are transformed into orthogonal codes, the spreading gain of Link16 is improved, and the performance is improved by about 2dB. However, the replacement of the non-orthogonal codes The scheme makes the system require more detector branches to recover the orthogonal symbols and the system capacity is still limited

[0008] In these Link16 data link waveform improvement schemes, from the perspective of spectrum utilization, the improved system can support higher transmission rates. Taking PCCSK as an example, the system transmission rate can be increased to 350.2kbps. However, for higher transmission rates, this scheme cannot reach, and the code selection algorithm of this scheme has the defect that the number of bits in the RS symbol may not be consistent with the number of bits sent; from the perspective of anti-interference performance, most of the improved schemes are improved in coding and decoding methods and modulation methods, and the transmission performance There is an increase of about 2-6dB, but the information transmission rate has not increased; whether it is spectrum utilization or anti-interference performance, there is still room for further improvement in Link16's waveform improvement

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