Preliminary results on performance evaluation of concatenated coding schemes over Rayleigh fading ionospheric channels

Nissopoulos, Ioannis K.; Dimakis, Christos E.; Kouris, S.S.; Roux, Yann

doi:10.1049/cp:19940490

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2001

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“…The desired Doppler spread for each Gaussian waveform is obtained by properly adjusting the "lter parameters. The validity of the above simulated channel has been extensively tested [17] in order to assure the accuracy of the simulated results. Figure 3 shows the model of the HF digital communication system considered.…”

Section: Channel Modelmentioning

confidence: 99%

Concatenated coding schemes and interleaving techniques over Rayleigh fading ionospheric channels

Nissopoulos

Dimakis

Kouris

2001

Int J Communication

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SUMMARYIn this paper the performance of a concatenated coding scheme is evaluated over a slow Rayleigh fading HF ionospheric link with additive white Gaussian noise (AWGN). Well-known Ungerboeck TCM techniques onto an 8-PSK signal set are used as inner codes and Reed}Solomon block codes as outer codes. The coded/modulated signal is further di!erentially encoded before transmission to combat random phase changes. Block interleaving techniques are necessary to randomise long bursts of errors caused by the fading channel. The performance of the proposed concatenated coding system is investigated for various Doppler spreads. Signi"cant coding gains are achieved over uncoded, diversity or other conventionally coded systems with a small bandwidth expansion. Finally the interesting e!ects of interleaving on the behaviour of the proposed systems are analysed.

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Section: Channel Modelmentioning

confidence: 99%