Fast frequency hopping (FFH) is a very effective way to combat jamming. In this paper, low density parity check (LDPC) code is employed to enhance the performance of FFH systems over Rayleigh fading channel under band multitone jamming (BMTJ). Moreover, maximum likelihood (ML) diversity combining and various robust diversity combining techniques which need partial or no side information (SI), are considered to improve the system capability of anti-jamming. Simulation results show that the proposed LDPC coded frequency hopping system provides excellent performance against band multitone jamming.Index Terms-Fast frequency hopping, low density parity check (LDPC) code, diversity combining, Rayleigh fading, band multitone jamming .
As a regional wireless communication means, a wireless broadband communication system mainly provides communication services for mountainous areas with imperfect infrastructure construction. When the system provides communication services in mountainous areas, the vehicle-mounted base stations encounter obstacles to block communication, which causes the problem of non-cascade communication. In this paper, an improved genetic algorithm based on the adaptive change of crossover and mutation probability is proposed to formulate the air platform relay network planning scheme. The simulation results show that the crossover and mutation probabilities of the adaptive improved genetic algorithm change with the iteration of the algorithm, which improves the search ability of the algorithm and prevents it from falling into the local optimal solution.
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