The 2 × 2 MIMO profiles included in Mobile Wi-MAX specifications are Alamouti’s space-time block code (STBC) for transmit diversity and spatial multiplexing (SM). The former has full diversity and the latter has full rate, but neither of them has both of these desired features. An alternative 2×2 STBC, which is both full rate and full diversity, is the Golden code. It is the best known 2×2 STBC...

This is a companion technical report of the main manuscript “Semidefinite Relaxation and Approximation Analysis of a Beamformed Alamouti Scheme for Relay Beamforming Networks”. The report serves to give detailed derivations of Lemma 1-2 in the main manuscript, which are too long to be included in the latter. In addition, more simulation results are presented to verify the viability of the BF Al...

Reconfigurable intelligent surface (RIS)-assisted transmission and space shift keying (SSK) appear as promising candidates for future energy-efficient wireless systems. In this article, two RIS-based SSK schemes are proposed to efficiently improve the error throughput performance of conventional systems, respectively. The first one, termed RIS-SSK with passive beamforming (RIS-SSK-PB), employs ...

In this study, we investigate the potential benefits of using Alamouti-like orthogonal space-time-frequency block codes (STFBC) in distributed multiple-input multiple-output (D-MIMO) systems. We derive a closed-form ergodic spectral efficiency (SE) formula, numerically calculate outage SEs, and propose centralized method for clustering radio units user equipment so that suitable STFBC is applie...

Coding theory addresses the problem of transmitting information accurately across noisy channels. When a sender transmits a signal s, it will suffer some changes before it reaches the receiver. The receiver then faces the problem of recovering the intended signal, given that he actually received some altered signal r. The challenge of coding theory, then, is to design a system which not only gi...

It is well known, that the Alamouti scheme is the only space-time code from orthogonal design achieving the capacity of multiple-input multiple-output (MIMO) wireless communication systems with nT = 2 transmit antennas and nR = 1 receive antenna. In this work, we propose the n-times stacked Alamouti scheme for nT = 2n transmit antennas and show that this scheme achieves the capacity in the case...