Design of a forward error correction algorithm for a satellite modem

[摘要] ENGLISH ABSTRACT:One of the problems with any deep space communication system is that information maybe altered or lost during transmission due to channel noise. It is known that any damageto the bit stream may lead to objectionable visual quality distortion of images at thedecoder. The purpose of this thesis is to design an error correction and data compressionalgorithm for image protection, which will allow the communication bandwidth to bebetter utilized. The work focuses on Sunsat (Stellenbosch Satellite) images as testimages. Investigations were done on the JPEG 2000 compression algorithm's robustnessto random errors, putting more emphasis on how much of the image is degraded aftercompression. Implementation of both the error control coding and data compressionstrategy is then applied to a set of test images. The FEe algorithm combats some if notall of the simulated random errors introduced by the channel. The results illustrates thatthe error correction of random errors is achieved by a factor of 100 times (xl00) on alltest images and that the probability of error of 10-2in the channel (10-4for image data)shows that the errors causes little degradation on the image quality.

[发布机构] Stellenbosch University