1 / 3

Uncoordinated Access

Optical OR Channel. Channel Coding Channel Model Output 0 if all users transmit 0 Output 1 if one or more users transmit 1 Interleaver Users can be uniquely addressed by interleaver pattern Trellis Code Data bits are protected from collisions using a specially designed non-linear code

justis
Download Presentation

Uncoordinated Access

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Optical OR Channel • Channel Coding • Channel Model • Output 0 if all users transmit 0 • Output 1 if one or more users transmit 1 • Interleaver • Users can be uniquely addressed by interleaver pattern • Trellis Code • Data bits are protected from collisions using a specially designed non-linear code • Reed Solomon Code • Ensures that the final data stream has BER<10-9 tx1 rx1 Star network tx2 rx2 … … txn rxn Uncoordinated Access • Transmitters can transmit at any time using an interleaver chosen from a family without informing anyone except the desired receiver • Interference is assumed De-interleaver OR channel Trellis Decoder Rate:1/20 Reed Solomon Decoder (255,237) 5 other tx

  2. System Implementation Component Integration Optical Receiver Thresholding and Retiming Logical System High Speed Electronic System Optical System Opticalcoupler amplifier Tx-6 4 modulator … laser 3 amplifier Tx-2 modulator 2 1 laser 0 amplifier Tx-1 modulator laser Lightwave detector thresholding retime Rx Logic Implementation • Interleaver: • 1600 bit interleaver • Use novel random write-by-row, read-by, column scheme • Trellis code: • 64 state parallel Viterbi decoding • Heavily pipelined

  3. Interdisciplinary Design • Channel Code Design • Trellis code combined with IDMA to protect against interference • FPGA Logic Design • Novel, parallel and high speed architectures to handle optical rates • Electrical / Optical Design • Six CW lasers intensity modulated with electrical signals Sponsored by Space and Naval Warfare Systems Center – San Diego (N66001-02-1-8938)

More Related