How to reduce the use of bandwidth LAN?

I want to design a relay system using two USRP of NI USRP 2922 with sample rates even as LTE standard. But there is limitation in the use of bandwidth of 1 Gbps LAN.

I don't think you should achieve the full rate on a USRP without a link dedicated to the PC.  The protocol used is UDP between USPR and PC which can be disruped by the latency of the network and cause packets to arrive out of order or get lost.  You should also assume that, due to the effects of edge filter only 80% of the specified bandwidth is usable.  (20 MHz of bandwdith requires a rate of IQ of 25. MECH / s)  It takes a fast PC with a very high quality (we use intel) NIC to get there.  But you will need to use the driver for the NIC card manufactuer and maximize the RX and TX buffers.  So far, I realized only on desktop computers and mobile no.  I also would assume the package of 20% load, so on a 1 Gbps link, I would not expect to exceed the 800 MB/s.

25 MS/s x (16 bit 16 bit I + q) = 800 MB/s

You can also, in the pilot, 8-bit mode which will halve your dynamic range, but also the data rate.

For a system like yours, you can consider to put a PC next to each usrp and install 2 network cards in each PC.  You will add the latency, but the additional computer will give you buffer against congestion and network problems.  In addition, relay is not a 'constant' streaming activity... only the RX is constant.  For TX, you can use the approach of gusts of transmission.

Erik

Tags: NI Products

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