Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 43 for “"precoding"”.
-
Linear Precoding for Downlink Network MIMO Systems
… edge users. Beamforming, also known as linear precoding, is a possible transmission strategy to reduce the interference in such networks, and thereby improve spectrum utilization.In this thesis, we propose three novel clustered linear precoding schemes applicable to network MIMO systems for …
-
Transmitter precoding for multi-antenna multi-user communications
Emerging wireless sensor networks and existing wireless cellular and ad hoc networks motivate the design of low-power receivers. Multi-user interference drastically reduces the energy efficiency of wireless multi-user communications by introducing errors in the bits being detected at the receiver. …
-
Iterative Leakage-Based Precoding for Multiuser-MIMO Systems
… the application of an iterative leakage-based precoding algorithm to practical multiuser-MIMO systems. We consider the effect of practical impairments including imperfect channel state information, transmit antenna correlation, and time-varying channels. Solutions are derived which improve …
-
MIMO Communication Capacity: Antenna Coupling and Precoding for Incoherent Detection
While the capacity of multiple-input multiple-output (MIMO) systems has been explored in considerable detail, virtually all literature on this topic ignores electromagnetic considerations. This dissertation explores electromagnetic effects on the capacity performance of these multi-antenna …
-
Random numerical linear precoding and channel estimation in massive MIMO systems
Thesis presented in fulfilment of the requirements for the degree of Doctor of Engineering in Electronic Engineering in the Faculty of Engineering and the Built Environment at Durban University of Technology, 2021.
-
Space -Time Transmit Precoding and Interference Suppression for a Wireless Downlink
The first topic considered in the thesis is interference suppression using space-time transmit filters for a multiuser system, assuming perfect channel feedback. The filter design is formulated as an optimization problem, and an iterative algorithm that converges to the global optimum is derived. …
-
Interpretation of Learned Solutions for Precoding-Oriented Massive MIMO CSI Feedback Design
… Base Station outputs a finite set of clustered precoding vectors. Our clustering analysis quantifies this structure, identifying 11 stable prototypes for the user's latent space and 12-18 prototypes for the precoder. By decoding the mapping from the latent clusters to the precoder clusters, we …
-
Power allocation and linear precoding for wireless communications with finite-alphabet inputs
… communication system/networks through linear precoding and power allocation. First, the mutual information or capacity region is derived for finite-alphabet inputs such as phase-shift keying (PSK), pulse-amplitude modulation (PAM), and quadrature amplitude modulation (QAM) signals. This …
-
Channel estimation and equalization for spread-response precoding systems in fading environments
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
-
Techniques for enhancing the performance of communication systems employing spread-response precoding
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
-
3D Massive MIMO and Artificial Intelligence for Next Generation Wireless Networks
… focuses on aspects of channel estimation and precoding for 3D massive MIMO systems and application of deep reinforcement learning (DRL) for MIMO broadcast beam synthesis. To be specific, downlink (DL) precoding and power allocation strategies are identified for a time-division-duplex (TDD) …
-
Exploiting channel symmetry in two-way channels
… a two-way training channel estimation and precoding scheme that shifts all the computation involved in dealing with multiplicative channel gain as well as frequency selective channels to the base station. This work demonstrates the first tractable implementation of a precoding based …
-
Spectral efficiency optimization with channel state information of a massive MIMO System
… major drawback in the adoption of fully digital precoding in large-array systems. This research focuses on reducing the number of RF chains while using fixed large number of arrays for spatial multiplexing gains. A hybrid precoding architecture for mm Wave systems has been proposed for a system …
-
Two–Way Relaying Communications with OFDM and BICM/BICM-ID
… part of the thesis, the design of distributed precoding in TWRC using OFDM under multipath fading channels is studied. The objective is to design a distributed precoding scheme which can alleviate MAI and achieve multipath diversity to combat fading. Specifically, three types of errors are …
-
Performance evaluation of massive MIMO Systems for future wireless access systems
… of massive MIMO through evaluation of linear precoding and receive combining methods that may be applicable to massive MIMO. Linear signal detection and precoding for MIMO is generally not optimal. Optimal methods such as Maximal Likelihood (ML) signal processing methods have high …
-
Capacity-approaching data transmission in MIMO broadcast channels
… downlink throughput can be optimized by joint precoding across multiple transmit antennas and exploiting small-scale fading of distributed multiple input and multiple output (MIMO) channels. There are three major results in this dissertation. First, it is shown that over a MIMO Gaussian …
-
Multimedia content adaptation for internet protocol television services in the IP multimedia subsystem
… terms of its relative strengths and weaknesses. Precoding has low processing requirements for the adaption of video but requires excessive amounts of disk storage; this is to ensure sufficient catering for the diverse range of video bit-rates and capabilities of user end-terminals.
-
A framework for low-complexity iterative interference cancellation in communication systems
… We begin by introducing mode-interleaved precoding, a transmitter preceding technique that conditions an interference channel so that the pairwise error probability of any two transmit vectors becomes asymptotically equal to the pairwise error probability of the same vectors over an AWGN …
-
Precoder Design for Cooperative Cognitive Radio Systems
… constraints. However, deriving optimal precoding scheme in a more general case is not straightforward, therefore, a sub-optimal structure is proposed when both the power and interference constraints are present. Finally, a novel iterative algorithm is proposed for the joint design of …
-
Advanced Interference Suppression Techniques for Spread Spectrum Systems
… based on switched interleaving and chip-wise precoding is proposed for the downlink case, whereas a preprocessing technique is employed for the uplink. The simulation results show that the performance of the proposed scheme outperforms the existing chip-interleaving, conventional linear …
Page 1 of 3