Re[2]: [Discuss-gnuradio] USRP bandwidth and FIFOs

[Andrey A]

Matt, thank you for quick reply!

> Andrey A wrote:
>> Hello!
>>
>> I have two questions about USRP:
>>
>> 1. It is stated on
>> http://www.comsec.com/wiki?UniversalSoftwareRadioPeripheral that USRP
>> can sustain 32 megabytes per second over USB2.0.
>> I'm about to build MIMO 2 antenna transmitter. As I and Q each occupy
>> 16 bits, for two-antenna sample it will require (16*2) * 2 = 64 bits
>> or 8 bytes. As a result I can get 32 / 8 = 4 mega samples per second
>> and from Nyquist theorem only 2 MHz wide signals could be transmitted.
>>
>>   

> 4 MS/s COMPLEX gives a 4 MHz nyquist band, since it is complex samples.

>> Please advise whether my reasonings are right.
>>
>> 2. What are the TX and RX FIFO buffers' sizes on the board?
>>   

> 2K lines, IIRC

1. Does 2K lines mean 2048 bits?

2. I noticed the HMC174MS8 switch on the tx/rx path. Does it mean what
Time Division Duplex is in use? We transmit and receive signals in
different time moments?


Thank you!