This paper focuses on Multiple-Input MultipleOutput (MIMO) Orthogonal Frequency Division Multiplexing (OFDM) systems, where the MIMO channel order is larger than the length of the Cyclic Prefix (CP). By swapping the filtering operations of the MIMO channel and the Fast Fourier Transform (FFT), it is shown that each tone of a MIMO OFDM system can be viewed as a MIMO Single-Carrier (SC) system. A...

In this paper we propose an energy efficient cooperative MIMO system. Space-time block codes (STBC) and code combining techniques are applied to utilize the inherent spatial diversity in wireless cooperative MIMO systems. We form a group of senders and receivers to provide higher order MIMO diversity and implement our STBC scheme in a distributed manner. In the receiving group, code combining i...

Virtual multiple input multiple output (MIMO) techniques are used for energy efficient communication in wireless sensor networks. We investigate virtual MIMO for fixed and variable rates. We propose energy efficient routing based on virtual MIMO. The simulation results show that virtual MIMO based routing is more energy efficient as compared to SISO (single input single output) for larger dista...

Applications of multiple input and multiple output (MIMO) with Stiefel manifold are growing in the next generation communications and their system engineering developments. These applications need to be optimized efficiently with less complexity and cost. In this research, optimization problems in MIMO systems using Stiefel manifold are considered. As far as general manifolds are concerned, opt...

The Multiple-Input-Multiple-Output (MIMO) technique was introduced to address the growing demand for higher data-rate applications in communication standards like 3G, WLAN, WiMAXTM. In MIMO systems, both the radio channel propagation conditions and antenna characteristics influence the end user’s quality-of-service (QoS). MIMO channel models, with the ability to simulate the multipath fading th...

This brief defines a new type of multiple-input multiple-output (MIMO) amplifier. We present basic structures for this MIMO series–series feedback amplifier (MIMO-SSFA), and the basic design equations. We provide a detailed example showing how this MIMO-SSFA may be used as a transmitting circuit for multiconductor interconnections.

This paper presents the next evolution of FD-MIMO technology for beyond 5G, where antennas of the FD-MIMO system are placed in a distributed manner throughout the cell in a multi-cell deployment scenario. This system, referred to as Distributed FD-MIMO (D-FD-MIMO) system, is capable of providing higher cell average throughput as well as more uniform user experience compared to the conventional ...

An investigation into the wavelet packet transform (WPT) modulation scheme for Multiple Input Multiple Output (MIMO) band-limited systems is presented. The implementation involves using the WPT as the base multiplexing technology at baseband, instead of the traditional Fast Fourier Transform (FFT) common in Orthogonal Frequency Division Multiplexing (OFDM) systems. An investigation for a WPT-MI...

Multiple InputMultiple Output (MIMO) biorthogonal partners arise in many different contexts, one of them being multiwavelet theory. They also play a central role in the theory of MIMO channel equalization, especially with fractionally spaced equalizers. In this paper we first derive some theoretical properties of MIMO biorthogonal partners. We develop conditions for the existence of MIMO biorth...