On the Use of FFH-MFSK for Ultra-Low Power Communications in a Jamming Environment

Abstract

We are interested in a communication system that operates in the presence of an intelligent jammer, under stringent power constraints, but with flexible bandwidth constraints. We optimize some of the key elements in the transceiver design for low power consumption, and thus high complexity components of the system, such as matched filters (MF), forward error correction (FEC) that employs iterative decoders, coherent demodulators, and bandwidth-efficient modulation formats, are not feasible for this research. Rather, our system is designed using M -ary frequency shift keying (MFSK) with non-coherent detection and fast frequency hopping (FFH), optimized two-pole bandpass filters (BPF), and Reed-Solomon (RS) codes with hard-decision decoding. Among other things, we show that by properly optimizing the key parameters of the BPFs and RS codes, we can design the system to be significantly less complex than the MF system with a performance loss of less than 1.4 dB for most scenarios that we considered. Further, the 2-pole BPF system can actually outperform the corresponding MF system by up to 2.4 dB in the presence of multi-tone jamming.INDEX TERMS M -ary FSK, multipath fading, ultra-low power-consumption, non-coherent detection, low-complexity filtering, fast frequency-hopping, partial-band noise jamming, multi-tone jamming, Reed-Solomon codes.

Performance Analysis of the Optimal Multitone Jamming for a MFSK-FH System

“…The amplitude of vector superposition result is obviously greater than that of the transmission signal, indicating that the energy of transmission signal is enhanced and the jamming purpose is not achieved. Consider that jamming both the data channel and idle channel, and the tone jamming can be expressed as (4). From the definition of JSR, the jamming power can be expressed as: J P S…”

“…With the increasing tension of spectrum resources and the development of communication countermeasure technique, the confrontation game between communication jamming and anti-jamming is gradually intensified [1] [2]. Frequencyhopping (FH) communication system is widely used for its excellent anti-jamming ability, low intercept probability and networking capability [3] [4].…”