Precoded multiuser MIMO and packet scheduling

Summary

Linear precoding for multiuser Multiple-Input Multiple-Output (MIMO) systems has attracted much attention recently due to the capacity enhancement ability at the system level. In the existing literature, the interactions between packet scheduling and array antenna techniques are studied based on system level simulation models. To our knowledge, theoretical analysis of linearly precoded multiuser Spatial Division Multiplexing (SDM) MIMO systems combined with Frequency Domain (FD) packet scheduling has not been studied so far. In this project, we investigate the distribution of Signal to Interference plus Noise Ratio (SINR) for multiuser spatial multiplexing OFDMA based downlink MIMO systems in combination with the base station based packet scheduler. The packet scheduler is used to exploit the available multiuser diversity in the time, frequency and spatial domains. In 3GPP Long Term Evolution (LTE) (also known as Evolved-UMTS Terrestrial Radio Access (E-UTRA or EUTRA)), Single Carrier (SC) Frequency Division Multiple Access (FDMA) has been adopted for uplink transmission, whereas the Orthogonal FDMA (OFDMA) signalling format has been exploited for the downlink transmission. SC-FDMA technique for uplink transmission has low Peak to Average Power Ratio (PAPR) property compared with competitive OFDMA technique. The SC-FDMA signal can be obtained by using Discrete Fourier Transform (DFT) spread OFDMA, where DFT is applied to convert time domain input data symbols to frequency domain before feeding them into an OFDMA modulator. For wide band wireless transmission systems, e.g., LTE OFDMA downlink and SC-FDMA uplink to simply scheduling task, several consecutive subcarriers are usually grouped together for scheduling. A basic scheduling unit is called a Resource Block (RB). The scheduler in Base Station (BS) may assign single or multiple RBs to a Mobile Station (MS). This project investigates space frequency scheduling for SC-FDMA based uplink multi-user MIMO system. We will also consider channel dependent scheduling algorithms for SC-FDMA based linearly precoded uplink MIMO systems

Supervisor(s)

Professor Branka Vucetic, Dr Zihuai Lin

Research Location

Electrical and Information Engineering

Program Type

PHD

Synopsis

Linear precoding for multiuser Multiple-Input Multiple-Output (MIMO) systems has attracted much attention recently due to the capacity enhancement ability at the system level. In the existing literature, the interactions between packet scheduling and array antenna techniques are studied based on system level simulation models. To our knowledge, theoretical analysis of linearly precoded multiuser Spatial Division Multiplexing (SDM) MIMO systems combined with Frequency Domain (FD) packet scheduling has not been studied so far. In this project, we investigate the distribution of Signal to Interference plus Noise Ratio (SINR) for multiuser spatial multiplexing OFDMA based downlink MIMO systems in combination with the base station based packet scheduler. The packet scheduler is used to exploit the available multiuser diversity in the time, frequency and spatial domains. In 3GPP Long Term Evolution (LTE) (also known as Evolved-UMTS Terrestrial Radio Access (E-UTRA or EUTRA)), Single Carrier (SC) Frequency Division Multiple Access (FDMA) has been adopted for uplink transmission, whereas the Orthogonal FDMA (OFDMA) signalling format has been exploited for the downlink transmission. SC-FDMA technique for uplink transmission has low Peak to Average Power Ratio (PAPR) property compared with competitive OFDMA technique. The SC-FDMA signal can be obtained by using Discrete Fourier Transform (DFT) spread OFDMA, where DFT is applied to convert time domain input data symbols to frequency domain before feeding them into an OFDMA modulator. For wide band wireless transmission systems, e.g., LTE OFDMA downlink and SC-FDMA uplink to simply scheduling task, several consecutive subcarriers are usually grouped together for scheduling. A basic scheduling unit is called a Resource Block (RB). The scheduler in Base Station (BS) may assign single or multiple RBs to a Mobile Station (MS). This project investigates space frequency scheduling for SC-FDMA based uplink multi-user MIMO system. We will also consider channel dependent scheduling algorithms for SC-FDMA based linearly precoded uplink MIMO systems

Want to find out more?

Contact us to find out what’s involved in applying for a PhD. Domestic students and International students

Contact Research Expert to find out more about participating in this opportunity.

Browse for other opportunities within the Electrical and Information Engineering .

Keywords

Wireless, Communications, Telecommunications, Copding, Information Theory, Cooperative communications, Cognitive radio, Relay, Interference cancellation, Iterative receiver, MIMO.

Opportunity ID

The opportunity ID for this research opportunity is: 647

Other opportunities with Professor Branka Vucetic

Other opportunities with Dr Zihuai Lin