User Activity

  • Posted a comment on ticket #290 on SourceForge Support

    Yes, this is a basic function that's definitely needed.

  • Posted a comment on discussion Help on DVB-T2 Common Simulation Platform

    Yes, in principle you can change the target, but beware that at a BER of 10^-7, the simulations will take much longer. This is because you need to run the simulation for long enough to get a statistically significant number of errors. The simulator also requires a minimum number of errored LDPC blocks because error events tend to come in bursts, and you need to see enough of these bursts for an accurate result (see clause 14.2 of the DVB-T2 Implementation Guidelines TR 102 831). Unless you are able...

  • Posted a comment on discussion Help on DVB-T2 Common Simulation Platform

    Usual first question: have you read the BBC White Paper 196? The best way to add an extra processing stage is to add it as a new module to the processing chain. The White Paper describes how the signals are passed from one module to the next and should allow you to work out how to do this. The 518400 cells are a whole number of LDPC FEC blocks. When these are mapped to the OFDM symbols there are left over OFDM cells which are filled with dummy cells. In addition, not all 8192 carriers are used in...

  • Posted a comment on discussion Help on DVB-T2 Common Simulation Platform

    I'll assume here that you've read the BBC R&D White paper WHP196. The best way to incorporate this would be to make your processing into a proper submodule which can be called in the process of the normal simulation. Since you don't want to use TR, you could make your module an alternative "concrete implementation" of the t2_tx_paprtr module: just make your own t2_tx_dvbt2XXpaprTR.m (replace XX with something to identify your algorithm) and modify t2_tx_paprtr_wr to add your function as an option....

  • Posted a comment on discussion Open Discussion on DVB-T2 Common Simulation Platform

    Thanks for the references. I think you might find that the CSP is too closely linked to the DVB-T2 standard and that substituting different codes might indeed be difficult. For example, there's the concept of BBFRAMEs which map directly onto LDPC codewords. If your alternative LDPC code has a different block size, it might not be straightforward to use it. On the other hand, the CSP includes things like signalling, interleaving and pilots which are needed in real life and might interfere with the...

  • Modified a comment on discussion Open Discussion on DVB-T2 Common Simulation Platform

    There's some discussion of PAPR simulation here. I'm not aware that anyone involved in that discussion has contributed their CCDF measurement code to the project. You are of course welcome to add such code and contribute it back to the project. I don't know anything about QC-LDPC or any of the other types of code that you mention. It may be that these are supported in MATLAB or that code for them is available from other MATLAB users. There isn't a great deal of activity on this forum, and for anything...

  • Posted a comment on discussion Open Discussion on DVB-T2 Common Simulation Platform

    There's some discussion of PAPR simulation here. I'm not aware that anyone involved in that discussion has contributed their CCDF measurement code to the project. You are of course welcome to add such code and contribute it back to the project. I don't know anything about QC-LDPC or any of the other types of code that you mention. It may be that these are supported in MATLAB or that code for them is available from other MATLAB users. From a quick Google search I haven't found any mention of QC-LDPC...

  • Modified a comment on discussion Help on DVB-T2 Common Simulation Platform

    Hi, The important message is this one: Error using t2_tx_dvbt2blfbuild (line 164) t2_tx_dvbt2blfbuild: PLP data exceeds capacity of T2 frame Tone Reservation uses particular OFDM cells (i.e. particular carriers in each symbol) to adjust the output waveform in order to reduce the peak-to-mean ratio. These carriers cannot be used to carry data, which means that, when you enable TR, the capacity of the T2 frame is reduced. However, the amount of data being carried doesn't automatically change, because...

View All

Personal Data

Username:
olliehaffenden
Joined:
2007-11-23 09:24:38

Projects

Skills

  • No skills entered.

Personal Tools