geeanlooca / deepspace-turbo Goto Github PK
View Code? Open in Web Editor NEWImplementation of the CCSDS (Consultative Committee for Space Data Systems) standard for Turbo Codes
License: MIT License
Implementation of the CCSDS (Consultative Committee for Space Data Systems) standard for Turbo Codes
License: MIT License
Upon calling turbo_initialize()
a memory block used to store interleaved messages is allocated.
If the function turbo_encode()
is called inside a parallelized for
loop, the same memory block is accessed by different threads, possibly corrupting the messages.
the function should be able to accept a packet_length + code.memory
long vector for a-priori probabilities since this is necessary when decoding turbo codes, where Extrinsic messages from a different code are passed to the convcode_extrinsic
function.
As of now, trellis termination generates all zeros in the systematic output, while in the proposed scheme the systematic output is equal to the feedback part. This is due to the fact that in the standard the systematic output is connected before the XOR block summing input and feedback.
Optimize memory allocation by pre-allocating the necessary space when initializing the code instead of allocating/deallocating inside each function at each call.
Consider storing outputs of convolutional encoders on a matrix, in order to be able to directly feed the BCJR decoders with the correct bit stream. This should also simplify the management of puncturing patterns.
As a sidenote, there's the need to create a new function that, given sigma, adds noise to the transmitted packet.
Hi Gianluna,
Thank you very much for your excellent work!
I am Wei Mingchuan from Harbin Institute of Technology. I am working on a lunar formation satellite project which will launch 2 micro-satellites to lunar helical orbit later this year. I build a GNU Radio OOT module for the downlink reception of the satellites, with your codes for turbo: https://github.com/bg2bhc/gr-dslwp/
During my recent tests I found that at low SNR sometimes the PLL of the receiver may faile before finished receiving a data block, this means the left half would be very unreliable. At this time turbo decoder will try to fix the errors but generate more errors. Is there any way to evaluate the quality of the data block?
Thank you very much!
Best Regards,
Wei Mingchuan
A declarative, efficient, and flexible JavaScript library for building user interfaces.
๐ Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
An Open Source Machine Learning Framework for Everyone
The Web framework for perfectionists with deadlines.
A PHP framework for web artisans
Bring data to life with SVG, Canvas and HTML. ๐๐๐
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
Some thing interesting about web. New door for the world.
A server is a program made to process requests and deliver data to clients.
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
Some thing interesting about visualization, use data art
Some thing interesting about game, make everyone happy.
We are working to build community through open source technology. NB: members must have two-factor auth.
Open source projects and samples from Microsoft.
Google โค๏ธ Open Source for everyone.
Alibaba Open Source for everyone
Data-Driven Documents codes.
China tencent open source team.