Forum Discussion
CheepinC_altera
Regular Contributor
6 years agoHi Gautam,
As I understand it, you have some inquiries related to connecting the CV LDPC encoder to decoder in WiMedia 1.5 mode. For your information, the output of encoder will need to undergo some conversion prior to feeding into the LDPC decoder. You are unable to directly feed the output of encoder back into the decoder. You will need to perform LLR and soft bit conversion on the output data of encoder.
Let me try to explain further on the meaning of LLR and soft bits as following:
1.The LLR is referring the simultaneous processing of how many bits or in other words to speed up the process. In other words, you would need to de-serialized the encoder output by factor of 2.
2.As for the soft bits, you would require to do the conversion to strongest soft bits. An example of conversion can looks like following:
a.For every encoded output bit 0, convert it to 4’b0111
b.For every encoded output bit 1, convert it to 4’b1000
You can try to generate the simulation example from LDPC IP for decoder. Then you can check on the raw data fed into the decoder IP to get further insight on the conversion.
Please let me know if there is any concern. Thank you.
- GKash6 years ago
New Contributor
Hi cpchan I understood your second point (converting into soft bits) but can u please explain what is deserializing by factor of 2. Does it mean to convert data into two liness one having odd bit and other one even. And if so is the case then which one to put in MSB side of encoder inputs. Thanks and regards Gautam