Abstract
At present, methods of bit error rate (BER) analysis for frequency-hopping (FH) system can only solve the problem of barrage jamming, but these are no comprehensive means to follower jamming (FJ). This paper proposes a method of BER analysis with FJ based on frequency hopping M-ary frequency-shift keying (FH/MFSK) system. Through the analysis of the mechanism of FH/MFSK system, assuming the wireless channel is an AWGN channel, the BER formulas for different jamming types are derived, respectively, from the point of one-dimensional probability density function of the output signal of the envelope detector, while judgment principle of envelope detecting method is used. Results show that the BER of multiple FH/MFSK system with FJ is relatively lower. In the worst case of FJ, the BER of FH/4FSK system and FH/8FSK system is reduced by 2 dB and 3 dB, respectively, compared with that of FH/2FSK system. The method of BER analysis proposed provides an effective means to research the BER with FJ in depth.
Highlights
FH communication has a strong ability to resist jamming and multipath fading [1]; it has been widely used in tactical communication and civil use [2]
A method of bit error rate (BER) analysis with follower jamming (FJ) is proposed for frequency hopping M-ary frequency-shift keying (FH/MFSK) system, and theoretical BER formulas are established. e method is based on the judgment principle of envelope detecting method for two typical types of FJ
FH modulation is performed, and the resultant signal is passed through an additive white Gaussian noise (AWGN) channel with FJ added
Summary
FH communication has a strong ability to resist jamming and multipath fading [1]; it has been widely used in tactical communication and civil use [2]. Ough the error probabilities in different communication channels were gained, the modulation mode was of low order, and the jamming mode only considered narrow-band noise. Existing methods of BER analysis for FH system with FJ were not comprehensive, ignoring the jamming modes or higher modulation order. 2. System Model e principle block diagram of FH/MFSK system is shown in Figure 1 [12], mainly including the transmitting end and the receiving end. System Model e principle block diagram of FH/MFSK system is shown in Figure 1 [12], mainly including the transmitting end and the receiving end It describes the main signal processing steps. En, the system mixes the received signal with the hopping RF signal output by the frequency synthesizer to obtain an IF modulated signal, performing MFSK demodulation by MFSK demodulator to obtain original information. Δt is the time delay of FJ signal compared with FH signal at each frequency and meets the condition 0 ≤ Δt < Td
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