Try to look at the problems whit new 4g technologies, like beamforming or penetration, or technologies that can help to increase signals on indoor enviorement, and give solutions for this.
I have found your post and the web link to be useful.i would like to start in beamforming technique.Can you spot any current issue in resource allocation in MIMO-OFDM.
Try to look at the problems whit new 4g technologies, like beamforming or penetration, or technologies that can help to increase signals on indoor enviorement, and give solutions for this.