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Conventionally, fast frequency hopping (FFH) is regarded as a non-coherent system, which has inevitable shortcomings in low spectral efficiency. To achieve a high spectral efficiency while maintaining a favourable bit error ratio (BER) performance in FFH systems, in this study, the authors extend their previously proposed subset-based coherent FFH (S-CFFH) scheme with the aid of spatial modulation...
The use of side information can dramatically improve the performance of fast frequency hopping (FFH) spread spectrum systems. Unfortunately, little paper discussed how to get this information. In this paper, the generation of side information for FFH systems in the presence of partial-band jamming is investigated. We focus on the slowly changing interference and propose an FFH receiver model with...
A fast frequency hopped spread spectrum system is described which employs a wideband receiver to detect partial-band jamming. We assume that the interference is locally statistically stationary over numbers of hop intervals. The signal energy of each channel is first calculated and then compared with a threshold to determine whether the channel is jammed. Different threshold configuration method is...
This study investigates how frequency offsets of multitone jamming affect the fast frequency-hopped binary frequency shift keying (FFH/BFSK) product-combining receiver (PCR) under additive white Gaussian noise (AWGN). We demonstrate the average bit-error-rate (BER) expressions of the FFH/BFSK PCR and the average BER expressions of an FFH/BFSK spread-spectrum (SS) communication system with frequency...
In this paper, a partial-band jamming suppression algorithm is proposed for a slow frequency hopping system with continuous phase modulation (CPM). The algorithm is based on a non-coherent iterative maximum a posteriori (MAP) detection and the jamming state information (JSI) estimation. The simulation results demonstrate that the algorithm performs well for the partial-band jamming suppression. Moreover,...
Differential frequency hopping (DFH) is a novel technique for the frequency-hopping system in HF (high frequency) bands. The frequency transition function (FTF) and the signal detection methods are the key issues for DFH system. Product-combining receiver (PCR) and linear-combining receiver (LCR) are adopted for DFH system in the paper. The performances of DFH system with the PCR and LCR are analyzed...
In this paper, we proposed a partial-band jamming suppression algorithm especially for a slow frequency hopping system. In this system, continuous phase modulation (CPM) is adopted, and the algorithm is based on the iterative noncoherent CPM detection and the jamming state information (JSI) estimation. The complexity of the system is reduced by iterative tree search scheme rather than the exhaustive...
Differential frequency hopping (DFH) is a novel technique for the frequency-hopping system in HF (high frequency) bands. The frequency transition function (FTF) and the signal detection methods are the key issues for DFH system. Symbol-by-symbol detection and sequence detection are adopted in DFH system. With these two detection methods, the symbol error rate (SER) performances of DFH system are analyzed...
Differential Frequency Hopping (DFH) is a novel technique for the frequency-hopping system in HF (High Frequency) bands. The frequency transition function (FTF) and the signal detection methods are the key issues for DFH system. Symbol-by-symbol detection and sequence detection are adopted in DFH system. With these two detection methods, the symbol error rate (SER) performances of DFH system are analyzed...
Differential frequency hopping (DFH) is a novel technique for the frequency-hopping system in HF (high frequency) bands. The frequency transition function (FTF) and the signal detection methods are the key issues for DFH system. A novel non-coherent detection scheme is proposed in asynchronous multi-user environments over Rayleigh-fading channels. With this novel detection scheme, the asynchronous...
Differential frequency hopping (DFH) is a novel technique for the frequency-hopping system in HF (high frequency) bands. The frequency transition function (FTF) and the signal detection methods are the key issues for DFH system. A novel non-coherent detection scheme is proposed in asynchronous multi-user environments and additive white Gaussian noise (AWGN) channels. The multi-user performance of...
A type of frequency-hopping system in HF (high frequency) bands, differential frequency hopping (DFH) system, is presented in this paper. The frequency transition function (FTF) and the methods of signal detection are the key issues for DFH system. Product-combining receiver (PCR) and Linear-combining receiver (LCR) are adopted in DFH system. With the PCR, the symbol error rate (SER) performances...
A type of frequency-hopping system in HF (high frequency) bands, differential frequency hopping (DFH) system, is presented in this paper. The frequency transition function (FTF) and the methods of signal detection are the key issues for DFH system. Symbol-by-symbol detection and sequence detection are adopted in DFH system. With these two detection methods, the synchronous multi-user performances...
Differential frequency hopping (DFH) is a novel technique for the frequency-hopping system in HF (High Frequency) bands. The frequency transition function (FTF) and the signal detection methods are the key issues for DFH system. Symbol-by-symbol detection and sequence detection are adopted in DFH system. With these two detection methods, the symbol error rate (SER) performances of DFH system are analyzed...
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