Performance of Turbo-coded Fh-ss with Partial-band Interference and Rayleigh Fading

Performance of Turbo-coded Fh-ss with Partial-band Interference

In this paper, we investigate the performance of turbo codes when applied to a frequency hopped spread spectrum system with partial-band interference, full-band thermal noise, and Rayleigh fading. We consider two types of channel side information: knowledge that the transmitted bit is jammed or unjammed and knowledge of the instantaneous fading amplitudes. Simulation is performed for coherent a...

Iterative channel estimation and decoding for convolutionally coded anti-jam FH signals

In this paper, an iterative algorithm for joint decoding and channel estimation in frequency-hopping (FH) networks is proposed. In the proposed algorithm, soft decoder outputs are used in the iterative estimation of the time-varying variance of the additive interference resulting from the sum of the thermal noise, partial-band noise jamming, and other-user interference. The soft outputs are als...

Coded FH/SS Communications in the Presence of Combined Partial-Band Noise Jamming, Rician Nonselective Fading, and Multiuser Interference

Turbo codes for noncoherent FH-SS with partial band interference

In this paper, turbo codes are investigated in a slow frequency-hopped spread spectrum (FH-SS) system with partialband jamming. In addition, full-band thermal noise is present. The channel model is that of a partial-band jammer in which a fraction of the frequency band is jammed and the remaining fraction is unjammed. This paper focuses on the implemention and performance of a modified turbo de...

Interference Mitigation in Frequency-hopped Spread-spectrum Systems

| In this paper we explore the error probability of diierent coding schemes in a frequency-hopped spread-spectrum communication systems subject to partial-band interference and a system subject to Rayleigh fading. The interplay between block length of the code and channel memory is quantiied. We show that there is an optimal memory length that maximizes performance. At low signal-to-noise ratio...