WARP Project Forums - Wireless Open-Access Research Platform

You are not logged in.

#1 2014-Oct-21 17:07:19

ofdm2013
Member
Registered: 2013-May-17
Posts: 131

Questions about rx_lpf_corn_freq and tx_lpf_corn_freq

1. What is the default value set for these two in WARPLAB reference design examples?

2. From the data sheet, rx_lpf has 4 possible arguments 0 1 2 3 corresponding to frequency band 15 19 28 36
  on the other hand, tx_lpf has only 3 possible arguments 1 2 3 corresponding to frequency band 24 36 48

They are actually not the same for the same arguments. For example, if I set 1 for both rx_lpf_corn_freq and tx_lpf_corn_freq, then the transmitting frequency is 24MHz while the receiving bandwidth is 19MHz? It's weird.

Offline

 

#2 2014-Oct-22 07:12:23

welsh
Administrator
From: Mango Communications
Registered: 2013-May-15
Posts: 612

Re: Questions about rx_lpf_corn_freq and tx_lpf_corn_freq

You can find the default values for those parameters in the ifc_init function.

Offline

 

#3 2014-Nov-06 20:29:43

ofdm2013
Member
Registered: 2013-May-17
Posts: 131

Re: Questions about rx_lpf_corn_freq and tx_lpf_corn_freq

Thanks. So the default value is tx@24MHz and rx@19MHz.
If I use WARP to receive a standard 20MHz signal, I will miss sone of the signal because the receiver is only listening on 19MHz bandwidth? Am I right?

welsh wrote:

You can find the default values for those parameters in the ifc_init function.

Offline

 

#4 2014-Nov-06 20:42:00

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

Re: Questions about rx_lpf_corn_freq and tx_lpf_corn_freq

The Rx LPF response is specified in the MAX2829 datasheet ("Rx BB Frequency Response" on pg 23). The register settings describe the 3dB point of the response.

Offline

 

Board footer