Coded FH/SS (Frequency-Hopped Spread-Spectrum) Communications in the Presence of Combined Partial-Band Noise Jamming, Rician Nonselective Fading, and Multiuser Interference

摘要

In this report, we address the problem of combatting combined interference in spread-spectrum communication links. We consider frequency-hopped spread-spectrum systems with M-ary FSK modulation and noncoherent demodulation that use forward-error control coding. The interference consists of partial-band noise jamming, nonselective Rician fading, other-user interference, and thermal noise. The coding schemes that we analyze include: Reed-Solomon codes (with or without diversity and error/only), erasure-error or parallel erasure/error decoding); binary, nonbinary, and dual-k convolutional codes with or without side information (information about the state of the channel); and concatenated schemes (Reed-Solomon outer codes with either inner detection-only block codes or inner convolutional codes). In all cases, we derive the minimum signal-to-jammer energy ratio required to guarantee a desirable bit error rate as a function of the fraction of the band that is jammed when the number of interfering users is fixed, and the maximum number of users that can be supported by the system as a function of the fraction of the band that is jammed, when the signal-to-jammer energy ratio is fixed. (Author)