Random Beamforming OFDMA for Future Generation Cellular Communication Systems

—This paper presents a downlink performance analysis of a Layered Random Beamforming (LRB) - MIMO-OFDMA Physical Layer (PHY) as applicable to future generation wireless communication systems. OFDMA is a popular multiple access candidate for future generation cellular communication systems which facilitates multi-user diversity by enabling multiple access in the frequency domain. Random Beamforming (RB) is a method which enables the exploitation of spatial multi-user diversity gain and a spatial multiplexing capacity gain. Unlike a conventional beamforming system, an RB system only requires effective signal to noise ratios (ESNR) as feedback and thus has potentially much lower feedback requirements than a system which requires feedback of more detailed channel information. The Layered method (LRB) enables the spatial multiplex of data transmitted simultaneously to different destinations. As a result it is able to offer a further spatial multi-user diversity gain, referred to here as l...

• Type: Conference
• Year: 2007
• Where: VTC
• Authors: Congzheng Han, Angela Doufexi, Simon Armour, Joe McGeehan, Yong Sun
• Keywords: Multi-user Diversity Gains, Spatial Multi-user Diversity, Spatial Multiplexing Capacity, VTC 2007