DocumentCode :
2898191
Title :
Short-Length Raptor Codes for Mobile Free-Space Optical Channels
Author :
Zhang, Wenzhe ; Hranilovic, Steve
Author_Institution :
Dept. Electr. & Comput. Eng., McMaster Univ., Hamilton, ON, Canada
fYear :
2009
fDate :
14-18 June 2009
Firstpage :
1
Lastpage :
5
Abstract :
Free-space optical (FSO) links are competitive wireless links offering high data rate, security and low system complexity. For mobile applications, e.g., from a ground base station to an unmanned aerial vehicle (UAV), the FSO channel can suffer from severe instantaneous misalignment. This time varying misalignment is unknown to the transmitter and causes data packet corruption and erasure. As a result, the application of traditional fixed-rate erasure coding techniques is difficult. In this paper, we consider the application of rateless Raptor codes for such mobile FSO channels. Due to the high data rates required, short-length (16-1024) Raptor codes are designed and simulated on a severe jitter FSO channel. A key advantage of Raptor codes is their independence on channel state, no matter how large the misalignment. With a 1 Gbps transmitter, the designed Raptor code with k = 64 message packets offers 560 Mbps data rate and decoding cost of 4.14 operations per packet when transmitting power is 20 dBm. In contrast, a traditional automatic repeat- request (ARQ) algorithm technique on the same FSO jitter channel achieves a rate of 60 Mbps.
Keywords :
codes; communication complexity; mobile communication; optical links; telecommunication security; wireless channels; bit rate 1 Gbit/s; bit rate 560 Mbit/s; competitive wireless links; data erasure; data packet corruption; free-space optical links; mobile applications; mobile free-space optical channels; rateless Raptor codes; security; short-length Raptor codes; system complexity; time varying misalignment; Communication system security; Communications Society; Computer vision; Costs; Decoding; Global Positioning System; Jitter; Optical receivers; Optical transmitters; Unmanned aerial vehicles;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Communications, 2009. ICC '09. IEEE International Conference on
Conference_Location :
Dresden
ISSN :
1938-1883
Print_ISBN :
978-1-4244-3435-0
Electronic_ISBN :
1938-1883
Type :
conf
DOI :
10.1109/ICC.2009.5199457
Filename :
5199457
Link To Document :
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