OF THE DISSERTATION Precoding-Based Techniques for Multiple Unicasts in Wired and Wireless Networks

LIU, JIA. Transmitter-based Multiple Access Interference Rejection and Diversity Techniques for Code-division Multiple Access Systems. (Under the direction of Dr. Alexandra Duel-Hallen) For the downlink of direct sequence code-division multiple access (DS-CDMA) systems, transmitter (Tx)-based multiple access interference (MAI) cancellation techniques, termed multiuser precoding, and Tx-based di...

One of the main objectives of this paper is to provide an information-theoretic answer on how to maximize energyefficiency in MIMO (multiple input multiple output) systems. In static and fast fading channels, for which arbitrarily reliable communications are possible, it is shown that the best precoding scheme (which includes power allocation) is to transmit at very low power (Q → 0). Whereas e...

In this paper, we analyze the ergodic spectral efficiency upper bound of a large-scale MIMO and the key technologies, we derive approximations of achievable rates with linear precoding techniques, namely Zero Forcing (ZF), Matched Filtering (MF), Eigen-Beam Forming (EBF) and Regularized Zero-Forcing (RZF). We further show that a simple EBF precoding scheme can achieve the same performance as RZ...

The expected operating scenarios of 5G pose a great challenge to orthogonal frequency division multiplexing (OFDM) which has poor out of band (OoB) spectral properties, stringent synchronization requirements, and large symbol duration. Generalized frequency division multiplexing (GFDM) which is the focus of this work, has been suggested in the literature as one of the possible solutions to meet...

Spatial multiplexing techniques send independent data streams on different transmit antennas to maximally exploit the capacity of multiple-input multiple-output (MIMO) fading channels. Most existing multiplexing techniques are based on an idealized MIMO channel model representing a rich scattering environment. Realistic channels corresponding to scattering clusters exhibit correlated fading and...

This letter proposes a robust joint linear precoding scheme based on the minimum mean squared error (MMSE) criterion for amplifyand-forward (AF) multiple-input multiple-output (MIMO) relay broadcast systems with limited feedback, where only the quantized channel direction information (CDI) of the forward channel is available for the base station (BS) and the relay station (RS). The proposed sch...

This work presents the results of indoor wideband measurements investigating the spacetime properties of wireless signal transmission with online time reversal precoding. The measurements were conducted using a new time-reversal wideband MIMO channel sounder operating at 2.45 GHz with a bandwidth of 240 MHz. Both line of sight and non line of sight propagation conditions were investigated. Spat...

The performance of uncoded orthogonal frequency division multiplexing (OFDM) over fading channels is generally improved by introducing some kind of coding. Different coding schemes for OFDM has been reported in the literature. Our aim in this paper is to compare the performance of different coded OFDM systems and compare their bandwidth-complexity tradeoffs. We consider three different coded OF...

Coarsely quantized massive Multiple-Input Multiple-Output (MIMO) systems are gaining more interest due to their power efficiency. We present a new precoding technique to mitigate the Multi-User Interference (MUI) and the quantization distortions in a downlink Multi-User (MU) MIMO system with coarsely Quantized Constant Envelope (QCE) signals at the transmitter. The transmit signal vector is opt...