Abstract:
PURPOSE: A hopping group operation apparatus and method thereof are provided to add the group bandwidth of a hopping group to the mapped hopping progression by mapping hopping progression to the value of an effective hopping bandwidth. CONSTITUTION: A normalization unit(110) maps the hopping progression of each hopping group using the value of an effective hopping band. An orthogonality processing unit(130) arranges the mapped hopping progression and the each hopping group according to each hopping progression in an ascending order of the mapped each hopping progression. The orthogonality processing unit adds the group bandwidth of the accumulated hopping group to the mapped hopping progression according to the arranged order.
Abstract:
PURPOSE: A method and apparatus for improving the anti-jamming performance of an SFH(Slow Frequency Hopping) system using an adaptive transmission method and a diversity combination method are provided to offer the communication capacity of group communication by maximizing the survivability of a communication link. CONSTITUTION: A hop frame repetition unit(130) repeatedly transmits arranged hop frames as the number of necessary diversity according to the hamming strength. A jamming level measurement unit(160b) measures jamming levels. A diversity combination unit(170) combines hop frames outputted a frequency reverse hopping unit(150) as the number of the diversity. A bit determination and frame processing unit(180) creates the created frame data as an information bit string.
Abstract:
PURPOSE: A frequency hopping communication apparatus and method thereof using chirp signals are provided to improve the nti-jamming performance of a frequency hopping communication which is weak to multi tone jammer. CONSTITUTION: A frequency hopping chirp signal transmitting unit(100) generates data symbol as the number of diversity. The frequency hopping chirp signal transmitting unit transmits the frequency of a chirp signal according to the data symbol. A frequency hopping chirp signal receiving unit(200) receives the chirp signal of the frequency. The frequency hopping chirp signal receiving unit hops the frequency of the received chirp signal. The frequency hopping chirp signal receiving unit modulates the chirp signal. The frequency hopping chirp signal receiving unit combines the modulated signal as the number of diversities.