The rapid and significant development of communications links between satellites has made it possible to use various applications such as relay voice, video, multimedia, etc. As a result, much research has been carrie...
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The rapid and significant development of communications links between satellites has made it possible to use various applications such as relay voice, video, multimedia, etc. As a result, much research has been carried out in this field during recent years to reduce power consumption and increase transmission reliability. This reported work focuses on analysis of intersatellite links in free space, with optical links using laser sources being considered in particular. The use of several different coding schemes are discussed for use in such links: multiple pulse position modulation (MPPM);digital pulse position modulation (DPPM);Dicodepulse position modulation (Dicode PPM). Work has been carried out to compare these coding schemes in terms of error weightings and coding efficiency through showing how the PCM error rate is affected by false alarm and erasure errors for MPPM, DPPM and Dicode PPM coding 3 bits of PCM. Comparison between these coding schemes is drawn in terms of sensitivity and bandwidth efficiency.
This paper presents analytical and detailed computer simulation results of the performance enhancement of pulsecodemodulation/Frequency modulation (PCM/FM) links using Reed Solomon (RS) channel coding. PCM/FM is a c...
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ISBN:
(纸本)0780381556
This paper presents analytical and detailed computer simulation results of the performance enhancement of pulsecodemodulation/Frequency modulation (PCM/FM) links using Reed Solomon (RS) channel coding. PCM/FM is a commonly deployed technique for a wide variety of telemetry and other links. Nevertheless, the required SNR to provide acceptable Bit Error Rate (BER) can be considerable. Thus, it is desired to provide channel coding to reduce the SNR requirement. The simulation of PCM/FM with and without RS coding requires the application of a variety of Signal Processing techniques discussed in the paper.
A digital still camera with a high speed signal processing in a simple hardware has been trially manufactured. The pixel-adaptive DPCM scheme is sequentially applied to each of the R, G, and B fields read out in the i...
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A digital still camera with a high speed signal processing in a simple hardware has been trially manufactured. The pixel-adaptive DPCM scheme is sequentially applied to each of the R, G, and B fields read out in the in-line sequential form from a CCD imager with vertical stripe color filters.
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