Is broadcast supported by the Communications System Design Suite and the LTE Framework?

[ref110]

I´ve read that the PBCH ist not supportet by the LTE Framework.

Is it possible to make measurements with eMBMS with a PXI-System. I´ve got the FlexRIO 7975R and the Receiver 5792.

We would like to do some measurements with LTE-Broadcast and we are not sure if the communication system design suite is useful for this.

Regards

Markus

[MelanieE]

Hi Markus,

you are right, PBCH is not supported by the LTE Framework currently.

Could you please describe the application you want to implement a bit further, so I can take a look into it deeper?

Thank you and best regards,

Melanie

[joergho]

Hi Markus,

let me further comment on your question and Melanies answer: the idea of the Application Frameworks is that you can modify the code and do custom extensions. This means that although PBCH is not implemented by default, you can add it yourself by reusing submodules from already existing channels (PDCCH, PDSCH). PBCH channel coding is similar to PDCCH channel coding, so you can reuse the LLR-demapper, descrambler and viterbi decoder submodules from the PDCCH decoder module.

However, if you want to receive a signal from a real LTE basestation (and not just from the LTE Framework Transmitter), there is more work to be done: the synchronization algorithm has to be adopted and the channel mapping has to be changed, because the current implementation only maps the implemented channels.

Kind regards,
Joerg

[ref110]

In our project we want to measure a real LTE eMBMS signal.

So eMBMS signal is transmitted with antennas and we want to measure it. My question is wheather teh communications suite with the LTE Framework is useful or not.

We need the PMCH channel.

[joergho]

Hi,

the PMCH channel encoding is very similar to the PDSCH channel encoding. PDSCH encoder and decoder are available in the LTE Application framework  and can be reused - so when you want to receive a PMCH channel you can reuse the PDSCH channel decoder. What you need to change is the resource demapping (which resource elements shall be marked as PMCH?) and the parameter calculation (e.g. modulation, number of resource elements, codeblock size, number of codeblocks).

Furthermore, the channel equalization for PMCH is based on MBSFN reference signals. For that purpose, the UERS channel estimation&equalization block which is available in the LTE application framework could be reused (here the mapping to resource elements and sequence generation needs to be adopted)

I hope this helps!

Regards,

Joerg

[apiluca]

Hi,

can i use a LTE Framework connecting pc and USRP 2940R with a G-Ethernet cable? I only was able to run it with a PCIe cable, but now i need to 

do it again with a G-Eth cable

Regards luca

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[tcap]

Hello Luca,

The LTE Framework requires an FPGA interface between the USRP RIO and the Host computer.  This is shown in section 3 of the following white paper:http://www.ni.com/white-paper/52524/en/.

I am sorry, but the FPGA interface with LabVIEW FPGA is only supported over the PCIe MXI Bus.

Regards,