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Implementation of a coded modulation for deep space optical communications

Show simple item record Cheng, Michael K. Moision, Bruce E. Hamkins, Jon Nakashima, Michael A. 2008-02-08T22:30:27Z 2008-02-08T22:30:27Z 2006-02-06
dc.identifier.citation Information Theory Workshop, San Diego, California, February 6-10, 2006. en
dc.identifier.clearanceno 06-0261
dc.description.abstract We present a field programmable gate array code (FPGA) implementation of a turbo-like decoder for a serially concatenated pulse-position modulation (SCPPM) code. NASA a developed this coded modulation scheme for deep space communications from Mars. Under a nominal mission condition, the decoder complexity by iteratively decoding the modulation and SCPPM coded system can operate within a one dB signal energy gap from capacity. The structure of SCPPM makes direct application of the conventional turbo decoding algorithm very inefficient. Here, we describe techniques to increase the throughput and performance of a hardware SCPPM decoder. using our optimizations, we demonstrate a 6 mega-bits per second (Mbps) decoder realization on a single FPGA. Extension toa higher data rate decoder using multiple FPGAs is readily achievable. Similar codes designed for the optical channel can bebenefit from our optimization techniques. en
dc.description.sponsorship NASA/JPL en
dc.format.extent 474252 bytes
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2006. en
dc.subject optical communications en
dc.subject coding en
dc.subject modulation en
dc.subject field programmable gate array (FPGA) en
dc.subject implementation en
dc.title Implementation of a coded modulation for deep space optical communications en
dc.type Preprint en

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