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#1 2018-Mar-26 05:37:23

SuperLynne
Member
Registered: 2018-Jan-20
Posts: 2

How to describe the relationship between IQ and RSSI's number?

hello,


I use example "wl_example_siso_ofdm_txrx" and I'd like to collect the data of rx_vec_air  and  RSSI, like below:

rx_vec_air = wl_basebandCmd(node_rx,RX_RF_VEC, 'read_IQ', 0, txLength);
RSSI= wl_basebandCmd(node_rx, RX_RF_VEC, 'read_RSSI', 0, txLength/(Ts_RSSI/Ts));


For example: 

rx_vec_air's dat file has 81445 points while RSSI's is 20361 points , I want to know what's the relationships?  and why not  rx_vec_air is "81445",   RSSI also is "81445 "?

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#2 2018-Mar-26 09:29:28

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

Re: How to describe the relationship between IQ and RSSI's number?

The WARPLab Reference Design runs the baseband ADC/DACs at 40MSps, and runs the RSSI ADC at 10MSps. Thus there are 4 I/Q samples for every RSSI sample. The analog RSSI signal (produced by the MAX2829) is lower bandwidth than the baseband I/Q signals, so a slower ADC is sufficient to digitize RSSI.

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#3 2018-Mar-30 03:08:04

SuperLynne
Member
Registered: 2018-Jan-20
Posts: 2

Re: How to describe the relationship between IQ and RSSI's number?

Thanks!

I have another question:“ What should I do if I want to use 5G to exchange 2.4G, and all the examples are about 2.4G, whould you please give me some advice?”

Looking forward your reply!

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#4 2018-Mar-30 10:42:18

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

Re: How to describe the relationship between IQ and RSSI's number?

You can set the radio's center frequency in the 2.4 or 5GHz bands with the channel command.

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