국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Dual-Pulse Pulse Position Modulation (DPPM) for Deep-Space Optical Communications: Performance and Practicality Analysis
저자	Li, Jing;; Hylton, Alan;; Budinger, James;; Nappier, Jennifer;; Downey, Joseph;; Raible, Daniel
Keyword	BANDWIDTH;; BIT ERROR RATE;; DEEP SPACE;; FREE-SPACE OPTICAL COMMUNICATION;; MATHEMATICAL MODELS;; PULSE DURATION;; PULSE POSITION MODULATION;; PULSE REPETITION RATE;; TURBULENCE;; WIRELESS COMMUNICATION
URL	http://hdl.handle.net/2060/20130000581
보고서번호	NASA/TM-2012-216042
발행년도	2012
출처	NTRS (NASA Technical Report Server)
ABSTRACT	Due to its simplicity and robustness against wavefront distortion, pulse position modulation (PPM) with photon counting detector has been seriously considered for long-haul optical wireless systems. This paper evaluates the dual-pulse case and compares it with the conventional single-pulse case. Analytical expressions for symbol error rate and bit error rate are first derived and numerically evaluated, for the strong, negative-exponential turbulent atmosphere;; and bandwidth efficiency and throughput are subsequently assessed. It is shown that, under a set of practical constraints including pulse width and pulse repetition frequency (PRF), dual-pulse PPM enables a better channel utilization and hence a higher throughput than it single-pulse counterpart. This result is new and different from the previous idealistic studies that showed multi-pulse PPM provided no essential information-theoretic gains than single-pulse PPM.