Re: [Discuss-gnuradio] Microwave Link Demodulation

Hi Ihab

For frequency higher than 6 Ghz,  a down converter can be used to over come this problem.

Exactly what we're saying!

I think it can handle this rate. Please correct me if i'm Wrong.

You might be wrong! As said, this is a hard task, and it's very hard to make things scale up on many CPUs, especially if there's dependence between data or steps - as is the case for anything decision aided, things like iterative decoders, long convolutional codes, etc.

If you successfully implement something that does this high-rate decoding on your CPUs alone, it'd definitely grab quite some attention from the SDR community.

• There are (synchronizers, equalizers, channel codes etc) blocks in the gr-dvbt project why I cant use them?
  

You can! But they are special-purpose for DVB-T. They might or might not be appropriate for your application and your channel.

• when you mentioned channel coding do you mean that i need to create a new one? and Why would I need it?

Because Channel coding is what you do to get a good BER with limited SNR, and it is typically a trade-off between computational complexity, error recovery/detection performance and suitability for the type of symbol error combinations you're expecting.

• If i need BCH performance Why is difficult to achieve?

Sorry, I don't understand

• if the data requirement is fine (CPU and etc), what is the best way to start building the receiver? How can I figure out the blocks That i need for this receiver?

Start small! Have you been through the GNU Radio tutorials on http://tutorials.gnuradio.org?  If you feel comfortable after reading these, dive into adapting existing things (gr-dvbt is really a good choice), and find out where your transceiver BER bottlenecks and where your computational bottlenecks come from.

Best regards,
Marcus

On 24.08.2016 16:12, Ihab Zine wrote:

Hi Ron and Marcus, 

For frequency higher than 6 Ghz,  a down converter can be used to over come this problem.

for the data rate and bandwidth, the PC i'm using has the following specifications:

Architecture:              x86_64

CPU op-mode(s):      32-bit, 64-bit

Byte Order:                Little Endian

CPU(s):                      20

On-line CPU(s) list:    0-19

Thread(s) per core:    2

Core(s) per socket:    10

Socket(s):                  1

NUMA node(s):         1

Vendor ID:                 GenuineIntel

CPU family:               6

Model:                       63

Model name:             Intel(R) Xeon(R) CPU E5-2660 v3 @ 2.60GHz

Stepping:                  2

CPU MHz:                1553.804

CPU max MHz:         3300.0000

CPU min MHz:          1200.0000

BogoMIPS:                5197.32

Virtualization:            VT-x

L1d cache:                32K

L1i cache:                 32K

L2 cache:                 256K

L3 cache:                 25600K

NUMA node0 CPU(s):     0-19

I think it can handle this rate. Please correct me if i'm Wrong.

i have other questions:

• There are (synchronizers, equalizers, channel codes etc) blocks in the gr-dvbt project why I cant use them?
  
• when you mentioned channel coding do you mean that i need to create a new one? and Why would I need it?
• If i need BCH performance Why is difficult to achieve?
• if the data requirement is fine (CPU and etc), what is the best way to start building the receiver? How can I figure out the blocks That i need for this receiver?

Regards 

Ihab

On 23 August 2016 at 14:34, Ihab Zine <ihab.zine13@gmail.com> wrote:

Hi Ron,

1) Frequency range: 1.5 - 38 GHz

2) Bandwidth range : 2 - 56 MHz

3) Modulation : Qpsk - 256 QAM

4) Data rate range : 150Mbit/s - 326Mbit/s.

5) Error correction method : i thinks it is FEC.

Ihab 

On 22 August 2016 at 12:33, Ihab Zine <ihab.zine13@gmail.com> wrote:

Hi All, 

I'm working on a project using GnuRadio And USRP 205 mini, i'm at the stage where i need to demodulate a microwave link signal. 

Anyone has an experience with Microwave link or tried to do something similar? Is it possiable to do it in gnuradio? or is there another approaches to do it? 

I'd appreciate any information you could give me.

Thanks 

Ihab 

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