Md Fazlul Kader

University of Chittagong · Department of Electrical and Electronic Engineering

Imagined speech recognition has developed as a significant topic of research in the field of brain-computer interfaces. This innovative technique has great promise as a communication tool, providing essential help to those with impairments. An imagined speech recognition model is proposed in this paper to identify the ten most frequently used Engli...

Natural surfaces have micro and nanostructures that affect the splashing behavior of water droplets falling on them. Synthetic surfaces mimicking this natural phenomenon have been previously reported. The objective of our current work is to design such surfaces and fine-tune the fluid splashing behavior using three-dimensional simulation tools. We...

One of the major causes of blindness in human beings is the diabetic retinopathy (DR). To prevent blindness, early detection of DR is therefore necessary. In this paper, a hybrid model is proposed for diagnosing DR from fundus images. A combination of morphological image processing and Inception v3 deep learning techniques are exploited to detect D...

Wireless networks have gone through unprecedented changes in the last decade owing to the rise in the number of users. Radio frequency (RF) energy harvesting (EH) (termed as RF-EH) can be a potential solution to encounter the energy constraints in the next generation wireless devices. In this study, we have proposed a new RF-EH technique from an RF...

This paper presents a black hole-aided deep-helix stochastic symmetric (termed as BH-DHSS) channel to enrich the traditional source distribution method and achieve integrated information bound to Deoxyribonucleic acid (DNA) communications. The conventional Bernoulli distributions and Shannon bounds do not match perfectly with the DNA information bo...

In this article, we present a black-hole-aided deep-helix (bh-dh) channel model to enhance information bound and mitigate a multiple-helix directional issue in Deoxyribonucleic acid (DNA) communications. The recent observations of DNA do not match with Shannon bound due to their multiple-helix directional issue. Hence, we propose a bh-dh channel mo...

In this article, we present a black-hole-aided deep-helix (bh-dh) channel model to enhance information bound and mitigate a multiple-helix directional issue in Deoxyribonucleic acid (DNA) communications. The recent observations of DNA do not match with Shannon bound due to their multiple-helix directional issue. Hence, we propose a bh-dh channel mo...

In this article, we present a black-hole -aided deep -helix (bh-dh) channel model to enhance information bound and mitigate a multiple-helix directional issue in Deoxyribonucleic acid (DNA) communications. The recent observations of DNA do not match with Shannon bound due to their multiple-helix directional issue. Hence, we propose a bh-dh channel...

A novel device-to-device (D2D) aided cooperative non-orthogonal multiple access (NOMA) scheme (termed as D2DSG- NOMA) is proposed, where two similar gain (SG) near users (NUs) with the capability of D2D communication and one far user (FU) are served within two time slots. The NOMA pair is formed with a NU and the FU. The paired NU is employed as a...

Establishing eye contact is the fundamental key to begin any interaction between human-human and robot-human. Two approaches are available to develop an eye contact mechanism for robot-human interaction, such as simplex and duplex. The two most critical tasks: gaze crossing and gaze awareness, are prerequisite to implementing an active eye contact...

Brain is the controlling center of our body. With the advent of time, newer and newer brain diseases are being discovered. Thus, because of the variability of brain diseases, existing diagnosis or detection systems are becoming challenging and are still an open problem for research. Detection of brain diseases at an early stage can make a huge diff...

A novel device-to-device (D2D) aided uplink transmission scheme exploiting non-orthogonal multiple access (termed as D2D-UNOMA) is proposed and investigated. In D2D-UNOMA, two similar gain near users (NUs) and a far user (FU) can transmit their information to the base station (BS) in two time slots. The NUs can directly communicate with the BS, whe...

In this paper, a novel interference free dual-hop device-to-device (D2D) aided cooperative relaying strategy (CRS) based on spatial modulation (SM) (termed D2D-CRS-SM) is proposed. In~D2D-CRS-SM, two cellular users (e.g., a near user (NU) and a relay-aided far user (FU)) and a pair of D2D transmitter (D$_1$)-receivers (D$_2$) are served in two time...

To meet the anticipated challenges of the fifth-generation and beyond wireless networks, multiple candidate technologies are needed to be integrated. Motivating by this, two cooperative simultaneous wireless information and power transfer (SWIPT) protocols are proposed in this study for cellular internet of things (IoT) networks by exploiting non-o...

To stay up to date with world issues and cutting-edge technologies, the newspaper plays a crucial role. However, collecting news is not a very easy task. Currently, news publishers are collecting news from their correspondents through social networks, email, phone call, fax, etc. and sometimes they buy news from the agencies. However, the existing...

Radio frequency energy harvesting (EH) can be one of the promising solutions to power up energy constrained devices in the next generation wireless networks. In this paper, we have studied the performance of a cooperative EH multi relay network by benefiting from the transmission of the best relay to the destination. We consider each of the relays...

We propose an interference free half-duplex cooperative relaying scheme with the aid of device-to-device (D2D) communication by employing spatial modulation (SM), where a D2D user helps the base station (BS) by forwarding the signal of the far user (FU). In phase-I, BS exploits SM to map information bits into two sets: modulation bits (near user’s...

Beam selection is a notable issue for recent wireless communications. A conventional single beam selection (SBS) concept is utilized to minimize the number of necessary radio frequency chains in millimeter-wave (mmWave) multiple-input multiple-output non-orthogonal multiple access (MIMO-NOMA) systems. In general, the traditional SBS concept cannot...

Non-orthogonal multiple access (NOMA) and cooperative spectrum sharing (CSS) are integrated into this work to enhance both spectrum efficiency and utilization. A clustering-based overlay spectrum sharing is proposed by exploiting NOMA in coordinated direct and relay transmission (CDRT) (termed as CSS-NOMA-CDRT). In CSS-NOMA-CDRT, a primary strong N...

In this paper, an uplink scheme that exploits cooperative diversity using power domain non-orthogonal multiple access (NOMA), termed UCD-NOMA, with successive interference cancellation receivers is proposed. A two-user case is considered, where both the NOMA users can communicate with the base station directly and indirectly via a half-duplex decod...

This paper proposes a device-to-device (D2D) enabling cellular full-duplex (FD) cooperative \textcolor{blue}{(DFC)} protocol using non-orthogonal multiple access (NOMA) called DFC-NOMA, where an FD relay acting D2D transmitter assists in relaying a NOMA far user's signal and transmits a D2D receiver's signal simultaneously. The ergodic capacity, ou...

This paper proposes a device-to-device (D2D) enabling cellular full-duplex (FD) cooperative (DFC) protocol using non-orthogonal multiple access (NOMA) called DFC-NOMA, where an FD relay acting D2D transmitter assists in relaying a NOMA far user's signal and transmits a D2D receiver's signal simultaneously. The ergodic capacity, outage probability,...

Radio frequency signals are abundant in nature. Energy constrained devices can harvest energy from these radio frequency signals and can perform information processing and transmission simultaneously. In this study, interference-aided a cooperative relaying scheme (termed as IA-EH-CRS) is proposed, where multiple energy-constrained devices acting a...

In this study, we present a new scheme for smart education utilizing the concept of a blockchain for question sharing. A two-phase encryption technique for encrypting question papers (QSPs) is proposed. In the first phase, QSPs are encrypted using a timestamp, and in the second phase, previously encrypted QSPs are encrypted again using a timestamp,...

A full-duplex diamond relay network using non-orthogonal multiple access (NOMA) is proposed in this paper wherein a BS communicates with a user through two dedicated decode-and-forward relays. Based on the channel conditions of relays, the BS transmits a superposed NOMA signal by following the downlink NOMA principle. After decoding intended symbol...

To meet with both the energy and spectral efficiency, cooperative non-orthogonal multiple access (NOMA) (termed as CNOMA) and simultaneous wireless information and power transfer (SWIPT) are integrated in this paper. Two different protocols such as CNOMA-SWIPT-PS and CNOMA-SWIPT-TS are proposed, by employing power-splitting (PS) and time-switching...

In order to stay up to date with world issues and cutting-edge technologies, the newspaper plays a crucial role. However, collecting news is not a very easy task. Currently, news publishers are collecting news from their correspondents through social networks, email, phone call, fax etc. and sometimes they buy news from the agencies. However, the e...

In order to stay up to date with world issues and cutting-edge technologies, the newspaper plays a crucial role. However, collecting news is not a very easy task. Currently, news publishers are collecting news from their correspondents through social networks, email, phone call, fax etc. and sometimes they buy news from the agencies. However, the e...

Non-orthogonal multiple access (NOMA) is regarded as a candidate radio access technique for the next generation wireless networks because of its manifold spectral gains. A two-phase cooperative relaying strategy (CRS) is proposed in this paper by exploiting the concept of both downlink and uplink NOMA (termed as DU-CNOMA). In the proposed protocol,...

A half-duplex bidirectional relaying (BR) technique using non-orthogonal multiple access (NOMA) (termed as BR-NOMA) is proposed and investigated in this paper. In BR-NOMA, multiple users in one NOMA group can exchange information simultaneously with multiple users in another NOMA group through a common relay. The optimal information exchanging user...

Non-orthogonal multiple access (NOMA) is regarded as a candidate radio access technique for the next generation wireless networks because of its manifold spectral gains. A two-phase cooperative relaying strategy (CRS) is proposed in this paper by exploiting the concept of both downlink and uplink NOMA (termed as DU-CNOMA). In the proposed protocol,...

Existing education systems are facing a threat of question paper leaking (QPL) in the exam which jeopardizes the quality of education. Therefore, it is high time to think about a more secure and flexible question sharing system which can prevent QPL issue in the future education system. Blockchain enables a way of creating and storing transactions,...

Non-orthogonal multiple access (NOMA) and cooperative spectrum sharing (CSS) are integrated into this work to enhance both spectrum efficiency and utilization. An overlay spectrum sharing is proposed by exploiting NOMA in coordinated direct and relay transmission (CDRT) (termed as CSS-NOMA-CDRT). In CSS-NOMA-CDRT, a primary strong NOMA user is dire...

In this letter, a novel Golden-Hadamard codebook (GHC) scheme is proposed to improve the performance of the traditional precoded Alamouti coding for multiple-input and single-output systems. Although the traditional discrete Fourier transform codebook (DFTC) performs satisfactorily with Alamouti coding and offers numerous benefits for the Rayleigh...

Non-orthogonal multiple access (NOMA) with successive interference cancellation receiver is considered as one of the most potent multiple access techniques to be adopted in future wireless communication networks. Data security in the NOMA transmission scheme is on much attention drawing issue. Blockchain is a distributed peer-to-peer network enable...

Non-orthogonal multiple access (NOMA) is considered to be a significant multiple radio access technology for future wireless networks owing to its improved spectral efficiency. This work proposes two different cases of a downlink two phase cooperative decode-and-forward relaying scheme using multiple-input-multiple-output non-orthogonal multiple ac...

Non-orthogonal multiple access (NOMA) is thought of as a challenging technique for providing the data rate and spectral efficiency requirement in the era of future wireless communication. This article studies the performance of a NOMA adopted two-cell downlink communication scenario where adjacent cells interfere into each other' s data transmissio...

Cooperative relaying strategy in Non-orthogonal multiple access (NOMA) is one of the most efficient techniques to increase the data reliability, enlarge the coverage area, and upgrade the spectral efficiency. This paper proposes amplify-and-forward (AF) relaying in cooperative systems using NOMA. The performance of AF and decode-and-forward relayin...

Non-orthogonal multiple access (NOMA) is recognized as a promising radio access technology for next generation wireless networks. In this paper, a novel full-duplex (FD) cooperative relaying scheme for a NOMA based system (termed FD-NOMA-VP) is proposed, where K similar gain near users and relay-aided N similar gain far users are distributed into d...

In this paper, a full-duplex (FD) non-orthogonal multiple access (NOMA) scheme for a cooperative relay sharing network (termed as FD-NOMA-RS) is presented, in which two source-destination pairs share a dedicated FD relay FD-R. Following the principle of uplink NOMA, both sources transmit their symbols to FD-R, forming a NOMA pair, by depending on t...

Non-orthogonal multiple access (NOMA) is considered as an effective technique for quenching the data rate demand in upcoming 5G wireless networks. This paper investigates the capacity of a multi-cell downlink network with two interfering cells over independent Rayleigh fading channels, where inter-cell interference is taken into account. Lastly, th...

This paper presents a cooperative spectrum sharing protocol using non-orthogonal multiple access in cognitive radio networks. A two-phase protocol comprising of a primary transmitter-receiver pair and a secondary transmitter-receiver pair is considered. In the proposed protocol, three data symbols can be transmitted during the two phases; this is u...

To cope with the exponential growth of existing mobile traffic and the emergence of new wireless applications, a new wireless communications system, namely a fifth-generation of wireless networks, abbreviated 5G, is anticipated to be emerged by 2020. As a possible candidate technique to radio access of 5G, non-orthogonal multiple access (NOMA) has...

A coordinated direct and relay transmission is proposed using uplink non-orthogonal multiple access (NOMA) (termed as UP-NOMA). A two-user uplink NOMA scenario is considered, where a cell-center user directly communicates with a base station (BS), whereas a cell-edge user needs the assistance of a half-duplex decode-and-forward relay to communicate...

We present a novel interference free dual-hop cooperative spectrum sharing protocol in cognitive radio networks exploiting spatial modulation (SM) at both primary transmitter (PT) and secondary transmitter (ST). A ST equipped with multi-antenna acts as a half-duplex decode-and-forward relay for the primary system. During phase-1, SM is invoked at P...

Non-orthogonal multiple (NOMA) access using successive interference cancellation and cognitive radio are two promising techniques for enhancing the spectrum efficiency and utilization for future wireless communication systems. This paper presents a NOMA-based cooperative hybrid spectrum sharing protocol for cognitive radio networks. A two phase dec...

Non-orthogonal multiple access (NOMA) has attracted significant attention in the research community as a potential radio access technology for future wireless networks. In this work, we propose a two-phase cooperative decode-and-forward (DF) relaying scheme based on Alamouti (2by�1 multiple-input single-output mode) space-time block coded non-ortho...

We propose and investigate a dual-hop cooperative relaying scheme using non-orthogonal multiple (NOMA) access (termed NOMA-RS) where two sources communicate with their corresponding destinations in parallel over the same frequency band via a common relay. In this scheme, after receiving symbols transmitted in parallel by both sources with different...

We propose two novel cooperative spectrum sharing (CSS) protocols by using time-switching and power-splitting based energy harvesting (EH), namely CSS-TSP and CSS-PSP respectively. The considered system consists of a set of energy constrained secondary transmitters (STs) that cooperate with the primary user (PU) to forward its symbol. All STs rely...

Non-orthogonal multiple access (NOMA) has attracted a significant attention to the research community as a potential candidate for 5G or future radio access. This paper presents a NOMA-based cooperative network where a transmitter considered as a base station communicates simultaneously with two users treating as a far user and a near user via the...

This paper addresses the power allocation issue in non-orthogonal multiple access (NOMA) systems. In NOMA, multiple paired users can simultaneously utilize the frequency bands of each other such that the message signals of all these users are superimposed by the transmitter by allocating different powers to all users. As the paired users communicat...

This paper proposes a strategy to efficiently utilize the spectrum of unpaired users in non-orthogonal multiple access (NOMA) systems. This is done by pairing multiple similar gain users to a single distant user in a non-overlapping frequency band pairing fashion. We consider a case where the number of far users in a cell is larger than the number...

Security is a critical issue to the operation of Internet of Things (IoT) at both the device and network levels. In this paper, we propose security strategies to access information in the IoT. Information in IoT can be classified into four different categories such as mission-critical, vital, sensitive and non-critical information. Three different...

Non-orthogonal multiple access (NOMA) is considered as a promising candidate for future radio access. This paper presents the Simulink implementation of NOMA over additive white Gaussian noise (AWGN) and Rayleigh fading channel. The presented model also forms strong basis for the software defined radio based platform for hardware implementation of...

This paper proposes a model (WHT-SMX), that combines spatial multiplexing (SMX) with walsh-hadamard transform (WHT). The use of WHT is to convert transmit symbols of SMX to change location of constellation points. This is helpful in extending the Euclidean distance between transmit symbols for precise detection. When phase modulation is applied on...

This paper addresses the issues related with conventional near–far user pairing in non-orthogonal multiple access. Performance effects of near–far pairing on regions with negligible channel gain differences between users are investigated. These regions occur when pairing is performed between cell center and cell edge users, thus leaving the cell mi...

This paper addresses the issues related with conventional near-far user pairing in downlink non-orthogonal multiple access (NOMA). Performance effects of near-far pairing on regions with negligible channel gain differences between users is investigated. These regions occur when pairing is performed between cell center and cell edge users, thus leav...

In this paper, we have proposed a novel two-phase cooperative spectrum sharing protocol on the basis of Alamouti space time block coded (STBC) non-orthogonal multiple access. The network scenario comprising of a primary transmitter-receiver pair and a secondary transmitter-receiver pair. During the first two time slots, the primary transmitter tran...

In this paper, we propose a cooperative decode-and-forward relaying scheme where two transmitters share a energy harvesting relay to communicate with their corresponding receivers. A three-phase protocol is considered where the energy constrained relay (R) harvests energy from the source signal during the first two phases. The relay retransmits a s...

Non orthogonal multiple access (NOMA) is considered as one of the promising candidates for next generation wireless communication. This paper evaluates the Bit Error Rate (BER) performance of coded and uncoded non orthogonal multiple access (NOMA). The system model consists of two users in a cell where one user is near to the base station and the o...

This paper presents an outage analysis of a cooperative relaying scheme over flat Rayleigh and Nakagami-$m$ fading channels. In the proposed scheme, secondary transmitters cooperatively relay the primary traffic. Each secondary transmitter, equipped with multiple antennas, is divided into one of the two clusters: a cooperative cluster (CC) and a no...

Cognitive radio (CR) and spatial modulation (SM) are two exciting and emerging techniques to increase the spectrum efficiency for 5G. In this paper, we present a novel cooperative spectrum sharing protocol using SM. A two phases uncoded decode-and-forward (UDF) relaying scheme is considered. A secondary transmitter (ST) consisting of Mt transmit an...

Healthcare services have been revolutionized with the help of wearable and ultraportable wireless devices technology. Smart textiles have gained popularity for biomedical applications to monitor long term physiological signal. Tendency of merging wearable devices into textile become a trend now a days. In this paper, an architecture of smart patien...

In this paper, we consider a cognitive relay network (CRN) in which the primary receiver (PR) is protected by peak transmit power Pst and/or peak interference power Q constraints. In addition, the interference effect from the primary transmitter (PT) is considered to show its impact on the performance of the CRN. We investigate the outage probabili...

In this paper, we derive a closed-form solution of the outage capacity for a cooperative primary network over independent and identically distributed Rayleigh fading channel. We consider a cognitive radio spectrum sharing environment where a set of secondary users coexist with a pair of primary transmitter (PT) - receiver (PR) pair. The secondary u...

In cognitive radio networks, methods to allow the efficient sharing of the radio spectrum without causing any harmful interference to the primary users and to solve the spectrum scarcity problem are necessary. Identifying the available spectrum resources through spectrum sensing, coordinating with other users for spectrum access, improving channel...

In this paper, we investigate the outage probability of a cooperative secondary network considering the interference effect from the primary transmitter. We consider a cognitive radio (CR) transmitter (ST) transmits data to a CR receiver (SR) with the assistance of a set of N CR relays by satisfying peak transmit power (PTP) constraint at the CR tr...

In this paper, we investigate the outage capacity of a secondary network in a cognitive radio (CR) cooperative spectrum sharing system consisting of a primary transmitter (PTx)-receiver (PRx) pair as well as multiple secondary transmitter (STx)-receiver (SRx) pairs. We evaluate the outage capacity of the secondary network in slow fading channel by...

In this study, we investigate the outage capacity of a cooperative relaying based cognitive radio network in slow fading channel. Our network scenario consists of a primary transmitter (PT) and primary receiver (PR) as well as a group of \(M\) secondary transmitter (ST)–receiver (SR) pairs. We grouped STs into active and inactive. Only one active S...

In this study, we investigate the ergodic capacity of a multi-antenna based cooperative relaying scheme in cognitive radio (CR) network under Rayleigh fading channel. The proposed network scenario consists of a primary transmitter-receiver (PT-PR) pair and a group of M secondary transmitter-receiver (ST-SR) pairs. By considering complexity, practic...

In this work, we propose a cooperative hybrid spectrum sharing protocol by jointly considering interweave (opportunistic) and underlay schemes. In the proposed protocol, secondary users can access the licensed spectrum along with the primary system. Our network scenario comprises a single primary transmitter-receiver (PTxPRx) pair and a group of M...

Cognitive radio (CR) has recently been identified as a promising technology to solve the spectrum inefficiency problem. CR users or secondary users (SUs) need to sense the presence of primary users (PUs) constantly and rapidly to utilize their unused spectrum. However, detection is compromised when a user experiences shadowing or fading effects. In...

The proposed system is intended to protect electrical appliances with a simple lock system. As for passcode, a 4 bit binary number is used. To input the pass code, four two state switches are utilized. The pass code is stored in a memory. It can be changed after unlocking the lock system using valid pass code. We use D type flip-flops as memory. Th...

Due to a wide range of applications, wireless sensor networks (WSNs) have recently attracted a lot of interest to the researchers. Limited computational capacity and power usage are two major challenges to ensure security in WSNs. Recently, more secure communication or data aggregation techniques have discovered. So, familiarity with the current re...

In this paper, we propose a cooperative hybrid spectrum sharing protocol by jointly considering interweave (opportunistic) and underlay schemes. In the proposed protocol, secondary users can access the licensed spectrum along with the primary system. Our network scenario comprises a single primary transmitter-receiver (PTx-PRx) pair and a group of...

At present cognitive radio networks allow moderate sharing of the radio spectrum without causing any harmful interference to licensed users. In this paper, we propose a new efficient medium access control (MAC) protocol that aims at improving the coexistence of licensed primary users (PU’s) & unlicensed secondary users (SU’s) in cognitive radio net...

We consider an underlay cognitive radio network consisting of a single pair of primary transmitter-receiver PTx-PRx and a group of M secondary transmitter-receiver pairs STx-SRx within the transmission range of the primary system. Secondary transmitters are partitioned into two groups K, KεM active secondary transmitters STi, i ε {1, 2,..., K} whic...

Cognitive radio technology has been developed in recent years to make efficient use of the wireless spectrum especially for opportunistic spectrum access. Cognitive radio technology enables the secondary (cognitive) users to use the unused licensed spectrum of the primary users. Medium Access Control (MAC) protocol plays a vital role in spectrum ut...