Earners of this badge have shown that they understand the principles of OFDMA and how it is applied to 4G LTE. They will be explain why OFDMA is prefered for wideband systems and list the benefits and challenges. the can describe the nature of orthogonality in the time and frequency domains. They will also be able to draw the resource grid for LTE highlighting the resource blocks, resource elements and show how resources can be used to map signalling and data.