On the relaxed maximum-likelihood blind MIMO channel estimation for orthogonal space-time block codes

This paper concerns the maximum-likelihood channel estimation for MIMO systems with orthogonal space-time block codes when the finite alphabet constraint of the signal constellation is relaxed. We study the channel coefficients estimation subspace generated by this method. We provide an algebraic characterisation of this subspace which turns the optimization problem into a purely algebraic one and more importantly, leads to several interesting analytical proofs. We prove that with probability one, the dimension of the estimation subspace for the channel coefficients is deterministic and it decreases by increasing the number of receive antennas up to a certain critical number of receive antennas, after which the dimension remains constant. In fact, we show that beyond this critical number of receive antennas, the estimation subspace for the channel coefficients is isometric to a fixed deterministic invariant space which can be easily computed for every specific OSTB code

The U.S. Corporate Tax Reform and Its Macroeconomic Outcomes

This find is registered at Portable Antiquities of the Netherlands with number PAN-0003394

Effects of Post-harvest Pre-cooling Processes and Cyclical Heat Treatment on the Physico-chemical Properties of "Red Haven Peaches" and "Shahmiveh Pears" During Cold Storage

Rosana G. Moreira, Editor-in-Chief; Texas A&M UniversityThis is a paper from International Commission of Agricultural Engineering (CIGR, Commission Internationale du Genie Rural) E-Journal Volume 6 (2004): A. Kalbasi-Ashtari. Effects of Post-harvest Pre-cooling Processes and Cyclical Heat Treatment on the Physico-chemical Properties of "Red Haven Peaches" and "Shahmiveh Pears" During Cold Storage. (July 2004)

Non-Accelerating Inflation Rate Of Unemployment (NAIRU) In Iran

The recent literature on monetary policy has raised many questions about the trade-off between inflation and unemployment and the assumption of a constant NAIRU. This paper tries to investigate the effects of monetary policy on NAIRU in Iran. We implement a structural Vector Auto Regression (VAR) model to measure the effects of monetary policy in shaping NAIRU in Iran’s economy. Our results suggest that monetary policy has negligible effects on NAIRU and the unemployment rate is mainly affected by labor market imperfections, such as wage rigidity, labor law, regulations, and institutions that do not match with today’s world economy

A Decision-Support Tool for the Choice of Fabrication Routes in the Context of Mass Personalization

In the saturated competitive markets of today, Mass Personalization (MP) is getting more and more attention. MP refers to the affordable fabrication of personalized products where the customer is involved from the beginning of product life-cycle (design phase). In order to keep personalized products affordable, it is important to select the most cost-effective fabrication route for each individualized order. To do so, this study proposes a Web-based Personalized Manufacturing Consulting System (WebPMCS) towards selecting the most cost-effective processes/resources for mass personalization in the on-demand manufacturing context. The proposed tool includes a Graphical User Interface (GUI), a cost estimation model, and a relational database. In this document, we explain the steps towards WebPMCS design and development. Then, we adapt WebPMCS to Spark Assisted Chemical Engraving (SACE). By the aid of this case-study, we validate the tool, and determine the most cost-effective fabrication routes for several personalized orders. Finally, we suggest using multi-head machines for SACE personalized fabrication and prove its benefits using WebPMCS. The proposed tool acts as an advanced calculator and a process/resource selector, and is aimed to be used as an enabling module for industry 4.0 manufacturing philosophy