Key Issues in Radio Interface Design

This project aims at investigating key issues in radio interface design for practical frequency-selective fading channels. It is focused on the new opportunities and challenges that arise when considering broadband radio systems, with an emphasis on packet data transmission. The purpose of such a radio interface is to carry packets to or from wireless users. The destination of packets may be one single user but especially in the downlink it may also be several users (broadcasting). The most important aspects related to the radio interface are high spectrum efficiency (as high number of bps/Hz as possible), high power efficiency (low transmitter power is important at least in wireless terminals), low delay (some packets are likely to have a maximum transmission delay of 10 ms), low complexity of algorithms (again, especially in wireless terminals) and adaptivity, for different requirements and channel conditions.