In this paper, we propose a new adaptive coding scheme for frequency-hop spread-spec-trum communication systems against jamming and interference. The scheme consists of an adaptive decoding algorithm, adaptive forward...In this paper, we propose a new adaptive coding scheme for frequency-hop spread-spec-trum communication systems against jamming and interference. The scheme consists of an adaptive decoding algorithm, adaptive forward error-correction using incremental redundancy and adaptive transmission rate control, which ensure the systems with extremely high reliability and efficiency.展开更多
The structural composition, scheme selection and component design of a five-channel transmitter combiner for 800MHz trucking mobile communication system (TMC) is proposed. More attentions have been paid to the analysi...The structural composition, scheme selection and component design of a five-channel transmitter combiner for 800MHz trucking mobile communication system (TMC) is proposed. More attentions have been paid to the analysis and design of the high-Q microwave resonant cavity with accurate tuning structure. Also, a model transmitter combiner designed by the authors is proposed. Test results of the combiner are given. It has been proved that the technical specifications of the combiner have reached an advanced technical level compared with the products of the same kind imported from abroad.展开更多
The technology of DDS-driven PLL is introduced and a new scheme of frequency synthesizer which is suitable for SW SFH/MFSK System is presented in this paper. Based on the special requirement of SW communication, a mod...The technology of DDS-driven PLL is introduced and a new scheme of frequency synthesizer which is suitable for SW SFH/MFSK System is presented in this paper. Based on the special requirement of SW communication, a model of the scheme is given and the results show that the frequency synthesizer has small frequency insteval (≤0.1 Hz), short switch pierod (<200 ms) and high frequency stability as crystal oseillator.展开更多
基金Academy of Electronic Science of China and Guangxi Education Commission
文摘In this paper, we propose a new adaptive coding scheme for frequency-hop spread-spec-trum communication systems against jamming and interference. The scheme consists of an adaptive decoding algorithm, adaptive forward error-correction using incremental redundancy and adaptive transmission rate control, which ensure the systems with extremely high reliability and efficiency.
文摘The structural composition, scheme selection and component design of a five-channel transmitter combiner for 800MHz trucking mobile communication system (TMC) is proposed. More attentions have been paid to the analysis and design of the high-Q microwave resonant cavity with accurate tuning structure. Also, a model transmitter combiner designed by the authors is proposed. Test results of the combiner are given. It has been proved that the technical specifications of the combiner have reached an advanced technical level compared with the products of the same kind imported from abroad.
文摘The technology of DDS-driven PLL is introduced and a new scheme of frequency synthesizer which is suitable for SW SFH/MFSK System is presented in this paper. Based on the special requirement of SW communication, a model of the scheme is given and the results show that the frequency synthesizer has small frequency insteval (≤0.1 Hz), short switch pierod (<200 ms) and high frequency stability as crystal oseillator.
