It depends on your test signal configuration. LTE-Advanced by definition can have up to 100MHz bandwidth, by aggregating five 20MHz LTE carriers. If this is your configuration and you want to analyze all of the component carriers simultaneously, you do need PXA with option B1x.
However, if you are working on a 40MHz or less signal configuration, or you want to analyze one component carrier at a time, you can use PXA, MXA or EXA with 40MHz or 25MHz bandwidth depending on your signal bandwidth.
It depends on your test signal configuration. LTE-Advanced by definition can have up to 100MHz bandwidth, by aggregating five 20MHz LTE carriers. If this is your configuration and you want to analyze all of the component carriers simultaneously, you do need PXA with option B1x.
However, if you are working on a 40MHz or less signal configuration, or you want to analyze one component carrier at a time, you can use PXA, MXA or EXA with 40MHz or 25MHz bandwidth depending on your signal bandwidth.
Regards -