| タイトル | Implementation of a Coded Modulation for Deep Space Optical Communications |
| 著者（英） | Moision, Bruce E.; Hamkins, Jon; Cheng, Michael K.; Nakashima, Michael A. |
| 著者所属（英） | Jet Propulsion Lab., California Inst. of Tech. |
| 発行日 | 2006-02-06 |
| 言語 | eng |
| 内容記述 | 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 benefit from our optimization techniques. |
| NASA分類 | Space Communications, Spacecraft Communications, Command and Tracking |
| 権利 | Copyright |
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