Open AccessDissertation
On Linear Transmission Systems
TLDR
The object in Part I is to study the impact of both the signaling rate and the pulse shape on the information rate of single antenna, single carrier linear modulation systems, and a iterative optimization method is developed, which produces precoders improving upon the best known ones in the literature.Abstract:
This thesis is divided into two parts. Part I analyzes the information rate of single antenna, single carrier linear modulation systems. The information rate of a system is the maximum number of bits that can be transmitted during a channel usage, and is achieved by Gaussian symbols. It depends on the underlying pulse shape in a linear modulated signal and also the signaling rate, the rate at which the Gaussian symbols are transmitted. The object in Part I is to study the impact of both the signaling rate and the pulse shape on the information rate.
Part II of the thesis is devoted to multiple antenna systems (MIMO), and more specifically to linear precoders for MIMO channels. Linear precoding is a practical scheme for improving the performance of a MIMO system, and has been studied intensively during the last four decades. In practical applications, the symbols to be transmitted are taken from a discrete alphabet, such as quadrature amplitude modulation (QAM), and it is of interest to find the optimal linear precoder for a certain performance measure of the MIMO channel. The design problem depends on the particular performance measure and the receiver structure. The main difficulty in finding the optimal precoders is the discrete nature of the problem, and mostly suboptimal solutions are proposed. The problem has been well investigated when linear receivers are employed, for which optimal precoders were found for many different performance measures. However, in the case of the optimal maximum likelihood (ML) receiver, only suboptimal constructions have been possible so far. Part II starts by proposing new novel, low complexity, suboptimal precoders, which provide a low bit error rate (BER) at the receiver. Later, an iterative optimization method is developed, which produces precoders improving upon the best known ones in the literature. The resulting precoders turn out to exhibit a certain structure, which is then analyzed and proved to be optimal for large alphabets.read more
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Dissertation
Reduced Receivers for Faster-than-Nyquist Signaling and General Linear Channels
TL;DR: A framework to design reduced-complexity receivers for FTN and general linear channels that achieve optimal or near-optimal performance and an improvement of the minimum phase conversion that sharpens the focus of the ISI model energy is proposed.
References
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Journal ArticleDOI
General minimum Euclidean distance-based precoder for MIMO wireless systems
TL;DR: This article investigates the linear precoder based on the maximization of the minimum Euclidean distance between two received data vectors and shows that the proposed precoder provides a significant improvement in terms of bit error rate performance compared to other traditional precoding strategies.
Journal ArticleDOI
Bit-Interleaved Coded Multiple Beamforming with Imperfect CSIT
TL;DR: This paper proposes a new distortion measure optimum under an arbitrary unitary transform and introduces a new set of centroids and employs the generalized Lloyd algorithm for codebook design for bit-interleaved coded multiple beamforming with imperfect knowledge of beamforming vectors.
Journal ArticleDOI
Optimal Two-Dimensional Lattices for Precoding of Linear Channels
TL;DR: This paper provides the complete solution for any nonsingular M × 2 channel matrix H, which means that HF, when viewed in four-dimensional real-valued space, spans the Schlafli lattice D4.
Proceedings ArticleDOI
Frequency Diversity Comparison of Coded SC-FDE & OFDM on Different Channels
Lei Ye,Alister G. Burr +1 more
TL;DR: This paper compares the relative performance of coded single carrier frequency domain equalisation (SC-FDE) and orthogonal frequency-division multiplexing (OFDM) on frequency-selective fading channels, focusing on the extent to which the two schemes can exploit the frequency diversity inherent in such channels.
Proceedings ArticleDOI
Generalized beamforming for MIMO systems with limited transmitter information
TL;DR: This work analyzes the outage performance of beamforming schemes in wireless systems equipped with multiple transmit and receive antennas and presents finite size beamformer codebook constructions which result in near-optimal outage performance for unit rank beamforming.