EE Seminar: Diversity Combining via Universal Dimension-Reducing Space-Time Transformations
Speaker: Elad Domanovitz
Ph.D. student under the supervision of Prof. Uri Erez
Wednesday, May 1st, 2019 at 15:00
Room 011, Kitot Bldg., Faculty of Engineering
Diversity Combining via Universal Dimension-Reducing Space-Time Transformations
Abstract
Receiver diversity combining methods play a key role in combating the detrimental effects of fading in wireless communication and other applications. A novel diversity combining method is proposed for multiple-antenna reception, where a universal, i.e., channel independent, orthogonal dimension-reducing space-time transformation is applied prior to quantization of the signals. The scheme may be considered as the counterpart of Alamouti modulation, and more generally of orthogonal space–time block codes. For the case of two antennas, the scheme provides the same worst-case performance as that afforded by selection diversity.
An important application of the scheme is to a scenario involving a single-antenna source node communicating with a destination node that is equipped with two antennas via multiple single-antenna relay nodes, where each relay is subject to an individual power constraint, where ultra-reliable and low-latency communication are desired. The latter requirement translates to considering only schemes that make use of local channel state information. Whereas for a receiver equipped with a single antenna, distributed beamforming is a well-known and adequate solution, no straightforward extension is known to the case of multiple receive antennas. We demonstrate how the novel receive diversity scheme enables to extend the distributed beamforming method to such scenarios. In comparison to a single-antenna destination node, the method doubles the diversity order without requiring any channel state information at the receiver while at the same time retaining the array gain offered by the relays.
