how to implement 2x2 MIMO with usrp 2944 and usrp x310

[roderon39]

hello, We tried to apply the Alamouti code for that URL(https://knowledge.ni.com/KnowledgeArticleDetails?id=kA03q000000x2rKCAQ&l=en-US).
Originally, explanation of URL is explained that 4 usrp 2920s are connected by 2 each, but we have only 3 usrp 2932s, and one usrp x310 and usrp 2944 each exist and try to replace them.

We use switch hub for control 2 usrps in one PC. And we alseo use synchronization with the CDA-2990.

Since there are two channels and there is one Tx and one Rx in each channel, we thought that we could replace two 2920s with x310 or 2941, but two errors occurred.

1. invalid input symbol array: Input symbol array is empty

2. code: 1299, Details: LookupError: keyError: update_clock_source: unknown source: mimo

How can I fix this error ?? And can it be implemented with x310 and 2944? Answers I'll wait. Thank you.

[pwjddl1126]

You can implement 2X2 MIMO system using the equipment you are using.

However, 2x2 Alamouti Example Code is not designed for usrp 2944 and usrp x310 which has 2 channels each. 

It is developed to use 4 USRP devices. Therefore, configuration for the devices might be different.

You cannot use the example code directly to your system.