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#1 2018-Nov-18 09:57:23

priya97
Member
Registered: 2018-Nov-18
Posts: 3

Ofdm Phy Layer

Sir, In general a OFDM transmitter will have serial to parallel converter(after constellation mapper) and parallel to serial converter(after ifft block) blocks but in 802.11n reference design why these are  blocks are not present in ofdm tx architecture?

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#2 2018-Nov-19 08:56:26

murphpo
Administrator
From: Mango Communications
Registered: 2006-Jul-03
Posts: 5159

Re: Ofdm Phy Layer

Our PHY designs use the Xilinx FFT cores. The Xilinx FFT cores use serial interfaces for input and output sample streams. There is no explicit serial-parallel conversion; the FFT core itself implements whatever sample buffering/indexing logic is requires to perform the transform.

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#3 2018-Nov-23 08:47:39

priya97
Member
Registered: 2018-Nov-18
Posts: 3

Re: Ofdm Phy Layer

Hi...As per my understanding , In wlan exp frame work using python code we can control the node as per our requirement. My doubt is some files(like node.py,node.c,ltg.py,ltg.c) are developed in both c as well as python. After programming with 802.11 reference design all c  files run locally on fpga then what is the use of python files?

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#4 2018-Nov-23 08:58:03

murphpo
Administrator
From: Mango Communications
Registered: 2006-Jul-03
Posts: 5159

Re: Ofdm Phy Layer

The C code runs on the node. The Python scripts run on your PC to control WARP v3 nodes running the 802.11 Ref Design. Please review the 802.11 ref design user guide for more details.

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#5 2018-Nov-23 10:27:16

priya97
Member
Registered: 2018-Nov-18
Posts: 3

Re: Ofdm Phy Layer

I have seen Example Scripts in Experiments Framework. in every example payload was created in default. if i want to give my own data as a payload which part of code i need to modify?

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#6 2018-Nov-26 10:26:08

chunter
Administrator
From: Mango Communications
Registered: 2006-Aug-24
Posts: 1212

Re: Ofdm Phy Layer

If you want to send your own custom data, you probably don't want to use the LTG (local traffic generator) framework. Instead, you can send custom data via Ethernet to the board and let the board encapsulate and send it for you. Note: you can still use wlan_exp to control an experiment and make measurements even if you aren't using LTGs but instead are sending your own traffic.

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