Comments (5)
Hi cod1239,
LLRs are defined as LLR = ln(P(bit=0)/P(bit=1)) - I think this is the ln that you are referring to. To get P(bit = 0) and P(bit = 1) in QPSK, you need to use exp - this comes from the Gaussian noise equation. So rather than using exp to get P(bit = 0) and P(bit = 1), then use ln to get LLR, we can cancel the exp and the ln out. This is why we don't need ln (or exp) to get LLRs from QPSK.
Take care, Rob.
from polar-3gpp-matlab.
How about the approximate LLR's for 64-QAM or say 8-PAM? I have all individual LLR's. My question is how to add them to get the total of LLR's to go for decoding. Here 8-PAM is not same as 4-PAM. QPSK, I have seen your codes. I am talking about polar codes, higher order modulation. I know eEidl's work and Tavildar's as well. I would like to keep the polarization base as 2x2 instead using Mahadafir's approach. Thank you so much. Matlab or Python either OK.
from polar-3gpp-matlab.
Hi kumuds4,
I use QPSK here because that is what 3GPP used throughout the polar code design and analysis process. Also, polar-coded control information is mostly (but not always) transmitted using QPSK in 5G New Radio.
But the code I have provided here can be readily combined with a higher order modulation scheme - the LLRs produced by a higher-order demodulator can be used directly with this polar decoder.
Take care, Rob.
from polar-3gpp-matlab.
from polar-3gpp-matlab.
Hello again,
You can see Matlab code for soft decision demodulation at...
https://github.com/robmaunder/exit-matlab
You just need to modify the bit_labels and constellation_points in soft_demodulate.m
Take care, Rob.
from polar-3gpp-matlab.
Related Issues (5)
Recommend Projects
-
React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
-
Vue.js
🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
-
Typescript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
-
TensorFlow
An Open Source Machine Learning Framework for Everyone
-
Django
The Web framework for perfectionists with deadlines.
-
Laravel
A PHP framework for web artisans
-
D3
Bring data to life with SVG, Canvas and HTML. 📊📈🎉
-
Recommend Topics
-
javascript
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
-
web
Some thing interesting about web. New door for the world.
-
server
A server is a program made to process requests and deliver data to clients.
-
Machine learning
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
-
Visualization
Some thing interesting about visualization, use data art
-
Game
Some thing interesting about game, make everyone happy.
Recommend Org
-
Facebook
We are working to build community through open source technology. NB: members must have two-factor auth.
-
Microsoft
Open source projects and samples from Microsoft.
-
Google
Google ❤️ Open Source for everyone.
-
Alibaba
Alibaba Open Source for everyone
-
D3
Data-Driven Documents codes.
-
Tencent
China tencent open source team.
from polar-3gpp-matlab.