Communications
A Novel Analog Predistortion Linearizer Based on a Schottky diode for Communication Applications

R. Karimzadeh Baee; A. Rahati Belabad; H. Moazzen; A. Ahmadi

Volume 10, Issue 1 , January 2022, , Pages 101-106

https://doi.org/10.22061/jecei.2021.7851.440

Abstract
  Background and Objectives: In order to compensate the nonlinearity, several linearization approaches such as feedback, feed-forward, and predistortion have been proposed. Among these linearization methods, the analog predistortion (APD) method is very suitable for the power amplifier and TWTA linearization, ...  Read More

Communications
On the Design of Coherent Zero-Forcing Receiver for the Flat Fading MIMO Multiple-Access Channels

M. Sheikh-Hosseini

Volume 7, Issue 2 , July 2019, , Pages 195-204

https://doi.org/10.22061/jecei.2020.6343.305

Abstract
  Background and Objectives: Design of low-complexity receiver for space-time block coded (STBC) transmission over multiple-input multiple-output (MIMO) multiple-access channels has been subject of interest over the years. In this regard, zero-forcing receiver, as a low complexity receiver needing as many ...  Read More

Communications
Interference Alignment Using Difference of Convex-based Beamformer Design for MIMO Interference Channels

N. Danesh; M. Sheikhan; B. Mahboobi

Volume 7, Issue 2 , July 2019, , Pages 231-240

https://doi.org/10.22061/jecei.2020.6108.280

Abstract
  Background and Objectives: To achieve significant throughput, interference alignment (IA) is an encouraging technique for wireless interference networks. In this study, we design an aligned beamformer based on the interference leakage minimization (ILM) method to reduce the interference power for a ...  Read More

Communications
Compact Low Pass Filter Using Sharp Roll-off Ultra-Wide Stopband T-shaped Resonator

F. Yousefi Moghadam; B. Afzali; F. Nadi; R. Zallbeygi

Volume 6, Issue 1 , January 2018, , Pages 25-31

https://doi.org/10.22061/jecei.2018.801

Abstract
  Background and Objectives: In this paper, an ultra-wide stopband microstrip low pass filter (LPF) with sharp roll-off and compact size is designed and fabricated. Also, proposed filter is designed, simulated, optimized, fabricated and measured and we can see a good agreement between the simulations and ...  Read More

Communications
Cryptanalysis of R2AP an Ultralightweight Authentication Protocol for RFID

M. Safkhani

Volume 6, Issue 1 , January 2018, , Pages 111-118

https://doi.org/10.22061/jecei.2018.1103

Abstract
  Background and Objectives: To overcome the security flaw of RAPP authentication protocol, Zhuang et al. proposed a novel ultralightweight RFID mutual authentication protocol, called R2AP. In this paper, we first propose a new desynchronization attack against this protocol. Methods: To extract the secret ...  Read More