LTE Visualisation Tool available to download

Displays the mapping of downlink Signals and Physical Channels onto the set of Resource Elements. Calculates throughputs for each modulation scheme and a range of coding rates. Allows exporting to a csv file for subsequent reading into Excel. Free to download from www.lte-bullets.com

The link is http://www.lte-bullets.com/visualisation_tool.html

The pre-requisite for this application is Microsoft's .NET Framework 4.0 which must have been installed on your PC.

Why we have the concept of VRB in LTE?

The mapping from VRBs to physical resource blocks (PRBs) allows for downlink distributed transmission in frequency domain .Downlink distributed transmission consists of two separate steps:

 (1) a mapping from VRB pairs to PRB pairs such that consecutive VRB pairs are not mapped to frequency-consecutive PRB pairs and
(2) a split of each resource-block pair such that the two resource blocks of the resource-block pair are transmitted with a certain frequency gap in between. The second step can be seen as frequency hopping on a slot basis.

Lot of documents explain you the importance of VRB. Please go throuh them.

Regards
Venu