| Frequency-Hopping (FH) is a novel spread spectrum communication technique, which develops very fast in military field due to its Low Probability of Intercept/Detection of properties and immunity against interferences, The extensive application of HF/VHF (high frequency /very high frequency) frequency-hopping radios in military has greatly enhanced the ability of military equipments against jamming and interception and ensure the safety and validity of chain of military command.At present, many military informations had developed form simple commanding order to radar detecting data, computer calculating results high-speed image fax and so on. Modern FH communication system need transmit a mass of data, traditional modulations are no longer suitable for high-speed data transmitting in FH system due to low spectrum efficiency. Therefore, it has a practical significance to develop some fit methods of modulation with high spectrum efficiency for shortwave FH communication system.In all kinds of modulation, with the advantages of good spectrum utilization and power efficiency as well as noncoherent demodulation can be... |
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