Reducing scintillation effects for optical free-space...

Details Reducing scintillation effects for optical free-space... Reducing scintillation effects for optical free-space...

2005-03-15

2005-03-15

Torres, Joseph D. (Department: 2133)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C714S701000, C714S761000, C714S787000, C714S788000

Reexamination Certificate

active

06868519

ABSTRACT:
A process and apparatus is described for recovering from optical transmission degradation due to scintillation effects in optical free space. A payload bit stream is encoded into Reed-Solomon codewords. These are fragmented and distributed as interleaved segments over a cell matrix of a SDRAM buffer store which is made large enough to correct a burst error occurring over 20 million consecutive bits. The rate imbalance between conventional read vs. write operations for SDRAM devices, which would otherwise obviate their use in this application by preventing real time operation, is overcome by an address remapping that avoids having to changing page addresses each time SDRAM memory is referenced. The remapping facilitates a more nearly equal allocation of READ overhead and WRITE overhead. An optical communications system employs at both the transmit and receive ends, substantially equivalent SDRAM buffer with address remapping capability.

REFERENCES:
patent: 5063533 (1991-11-01), Erhart et al.
patent: 5889791 (1999-03-01), Yang
patent: 5907563 (1999-05-01), Takeuchi et al.
patent: 6075824 (2000-06-01), Trost et al.
patent: 6313932 (2001-11-01), Roberts et al.
patent: 6625763 (2003-09-01), Boner

Affiliated with

Also associated with

Rating

Reducing scintillation effects for optical free-space... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Reducing scintillation effects for optical free-space..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reducing scintillation effects for optical free-space... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3382965