Omer Al-dulaimi - Academia.edu (original) (raw)
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Papers by Omer Al-dulaimi
Sensors
The purpose of this paper is to provide a high-level overview of the most important non-orthogona... more The purpose of this paper is to provide a high-level overview of the most important non-orthogonal multiple access (NOMA) protocols in 5G and 6G networks that incorporate code division within the context of 3GPP standardization. The article’s objective is also to look into and compare the various strategies that have been proposed as a solution to the issue of resource distribution to achieve high performance. Many different NOMA plans for 5G and 6G systems have been suggested by a multitude of businesses. NOMA is currently developing in two primary directions: one of them is with power division, and the other is with code division. During the process of standardization carried out by the 3GPP, the attention of the developers was concentrated in the second direction for the application of NOMA schemes in 5G and 6G systems. Hardware communication, also known as D2D communication, performs a significant role in the process of communication between devices. This will increase the effic...
2022 International Symposium on Multidisciplinary Studies and Innovative Technologies (ISMSIT)
2022 14th International Conference on Communications (COMM)
2020 13th International Conference on Communications (COMM), 2020
In the context of trying to obtain a solution for using the limited radio spectrum resources in a... more In the context of trying to obtain a solution for using the limited radio spectrum resources in an efficient way, the design of equipment having flexible RF front ends arose as a necessity. The software defined radio (SDR) approach offered such characteristics and several producers developed such platforms in recent years. In the current paper, several SDR platforms are compared from a RF front end receive performance point of view. Several measurements were performed in different frequency bands using the SDR platforms, using a spectrum analyzer as a reference. The results are analyzed and discussed having in mind the use of such a platform for performing spectrum sensing applications, which is a key necessity for the design of dynamic spectrum access (DSA) capable equipment.
2021 International Congress of Advanced Technology and Engineering (ICOTEN), 2021
a model is created for the joint service of multi-service traffic in the IMS / LTE network. The r... more a model is created for the joint service of multi-service traffic in the IMS / LTE network. The reception of requests for the transmission of service traffic in real time follows the Poisson model. The groups also receive demands for data traffic transfer based on the Poisson model. The group's requests occupy the free units of the line resource or the free waiting places to start the service if the entire resource is occupied. If all available resources and waiting spaces are filled, requests that exceed the group will be denied. The requests' number in the group ranges among one and the sum of the number of units of resources and waiting places and is determined by that of the corresponding probability, which sums to one. The size of the file is distributed exponentially with an average value expressed in bits. Priority is given to real-time traffic in terms of occupying and using the channel resource. This is expressed in the reduction of the data transfer speed to a certain minimum value equal to the selected unit of resources.
2021 International Symposium on Signals, Circuits and Systems (ISSCS), 2021
The spectrum scarcity has become an important issue for the new generation of mobile communicatio... more The spectrum scarcity has become an important issue for the new generation of mobile communications. The cognitive radio (CR) approach represents a practical solution for this problem by inserting spectrum-aware terminals or secondary users (SU) that aim to sense efficiently the presence and absence of the licensed users or primary users (PU). Therefore, the spectrum sensing is the paramount SU function for CR systems. In this paper, we modify a double-threshold spectrum sensing algorithm based on mean energy detection (MED) that was introduced recently. In fact, we introduce an adaptive threshold for the MED test, which minimizes the overall decision error probability (DEP). The simulation results show that the novel adaptive spectrum sensing algorithm outperforms the conventional double-threshold algorithm for any value of the duty cycle. For example, a signal-to-noise ratio (SNR) gain of 3 dB was noticed for low duty cycle values (i.e., 30%). However, the proposed algorithm performs even better at high duty cycle and low SNR values.
IOP Conference Series: Materials Science and Engineering, 2021
In cognitive radio systems, users that are cognitive (unlicensed) must constantly scan the spectr... more In cognitive radio systems, users that are cognitive (unlicensed) must constantly scan the spectrum for primary (licensed) users to be present. In this article, the researchers display the benefits of cognitive radio collaboration. It is demonstrate that detection times can be reduced by motivating cognitive users to cooperate in the same band, thus increasing overall agility. Next, a cognitive two-user radio network is depicted and a method to exploit the inherent network asymmetry to improve agility. It is shown that our cooperation program improves the efficiency of cognitive users by 35%. The researchers then extend the cooperation scheme to two user-per-carrier multi-corporate networks and calculate the gain in asymptotic agility.
2020 13th International Conference on Communications (COMM), 2020
Cooperative spectrum sensing for Cognitive Radio (CR) networks involves more opportunistic Second... more Cooperative spectrum sensing for Cognitive Radio (CR) networks involves more opportunistic Secondary Users (SUs) that help each other to detect the presence of the signal transmitted by a licensed Primary User (PU). Among cooperative spectrum sensing methods, the Amplify and Forward (AF) technique assumes that SUs relay the received signals without additional processing. In the present paper, inspired by previous works, we introduce a novel cooperative AF scheme with three SUs, where two SUs (denoted as S2 and S3) perform a sequential relaying for the signal transmitted by the third SU (S1) using a Time Division Multiple Access (TDMA) transmission protocol. This sequential relaying requires three consecutive time slots. In the first slot, S1 transmits a test signal; in the second slot, S2 relays the signal received during the first slot; in the third slot, S3 relays the signal received during the second slot. Considering the conventional Energy Detection (ED), the detection probability is estimated analytically and by simulation. Even the novel scheme requires an additional time slot, we demonstrate that the sequential relaying AF scheme outperforms the non-cooperative scheme for almost any topological position of the relaying SUs.
Sensors
The purpose of this paper is to provide a high-level overview of the most important non-orthogona... more The purpose of this paper is to provide a high-level overview of the most important non-orthogonal multiple access (NOMA) protocols in 5G and 6G networks that incorporate code division within the context of 3GPP standardization. The article’s objective is also to look into and compare the various strategies that have been proposed as a solution to the issue of resource distribution to achieve high performance. Many different NOMA plans for 5G and 6G systems have been suggested by a multitude of businesses. NOMA is currently developing in two primary directions: one of them is with power division, and the other is with code division. During the process of standardization carried out by the 3GPP, the attention of the developers was concentrated in the second direction for the application of NOMA schemes in 5G and 6G systems. Hardware communication, also known as D2D communication, performs a significant role in the process of communication between devices. This will increase the effic...
2022 International Symposium on Multidisciplinary Studies and Innovative Technologies (ISMSIT)
2022 14th International Conference on Communications (COMM)
2020 13th International Conference on Communications (COMM), 2020
In the context of trying to obtain a solution for using the limited radio spectrum resources in a... more In the context of trying to obtain a solution for using the limited radio spectrum resources in an efficient way, the design of equipment having flexible RF front ends arose as a necessity. The software defined radio (SDR) approach offered such characteristics and several producers developed such platforms in recent years. In the current paper, several SDR platforms are compared from a RF front end receive performance point of view. Several measurements were performed in different frequency bands using the SDR platforms, using a spectrum analyzer as a reference. The results are analyzed and discussed having in mind the use of such a platform for performing spectrum sensing applications, which is a key necessity for the design of dynamic spectrum access (DSA) capable equipment.
2021 International Congress of Advanced Technology and Engineering (ICOTEN), 2021
a model is created for the joint service of multi-service traffic in the IMS / LTE network. The r... more a model is created for the joint service of multi-service traffic in the IMS / LTE network. The reception of requests for the transmission of service traffic in real time follows the Poisson model. The groups also receive demands for data traffic transfer based on the Poisson model. The group's requests occupy the free units of the line resource or the free waiting places to start the service if the entire resource is occupied. If all available resources and waiting spaces are filled, requests that exceed the group will be denied. The requests' number in the group ranges among one and the sum of the number of units of resources and waiting places and is determined by that of the corresponding probability, which sums to one. The size of the file is distributed exponentially with an average value expressed in bits. Priority is given to real-time traffic in terms of occupying and using the channel resource. This is expressed in the reduction of the data transfer speed to a certain minimum value equal to the selected unit of resources.
2021 International Symposium on Signals, Circuits and Systems (ISSCS), 2021
The spectrum scarcity has become an important issue for the new generation of mobile communicatio... more The spectrum scarcity has become an important issue for the new generation of mobile communications. The cognitive radio (CR) approach represents a practical solution for this problem by inserting spectrum-aware terminals or secondary users (SU) that aim to sense efficiently the presence and absence of the licensed users or primary users (PU). Therefore, the spectrum sensing is the paramount SU function for CR systems. In this paper, we modify a double-threshold spectrum sensing algorithm based on mean energy detection (MED) that was introduced recently. In fact, we introduce an adaptive threshold for the MED test, which minimizes the overall decision error probability (DEP). The simulation results show that the novel adaptive spectrum sensing algorithm outperforms the conventional double-threshold algorithm for any value of the duty cycle. For example, a signal-to-noise ratio (SNR) gain of 3 dB was noticed for low duty cycle values (i.e., 30%). However, the proposed algorithm performs even better at high duty cycle and low SNR values.
IOP Conference Series: Materials Science and Engineering, 2021
In cognitive radio systems, users that are cognitive (unlicensed) must constantly scan the spectr... more In cognitive radio systems, users that are cognitive (unlicensed) must constantly scan the spectrum for primary (licensed) users to be present. In this article, the researchers display the benefits of cognitive radio collaboration. It is demonstrate that detection times can be reduced by motivating cognitive users to cooperate in the same band, thus increasing overall agility. Next, a cognitive two-user radio network is depicted and a method to exploit the inherent network asymmetry to improve agility. It is shown that our cooperation program improves the efficiency of cognitive users by 35%. The researchers then extend the cooperation scheme to two user-per-carrier multi-corporate networks and calculate the gain in asymptotic agility.
2020 13th International Conference on Communications (COMM), 2020
Cooperative spectrum sensing for Cognitive Radio (CR) networks involves more opportunistic Second... more Cooperative spectrum sensing for Cognitive Radio (CR) networks involves more opportunistic Secondary Users (SUs) that help each other to detect the presence of the signal transmitted by a licensed Primary User (PU). Among cooperative spectrum sensing methods, the Amplify and Forward (AF) technique assumes that SUs relay the received signals without additional processing. In the present paper, inspired by previous works, we introduce a novel cooperative AF scheme with three SUs, where two SUs (denoted as S2 and S3) perform a sequential relaying for the signal transmitted by the third SU (S1) using a Time Division Multiple Access (TDMA) transmission protocol. This sequential relaying requires three consecutive time slots. In the first slot, S1 transmits a test signal; in the second slot, S2 relays the signal received during the first slot; in the third slot, S3 relays the signal received during the second slot. Considering the conventional Energy Detection (ED), the detection probability is estimated analytically and by simulation. Even the novel scheme requires an additional time slot, we demonstrate that the sequential relaying AF scheme outperforms the non-cooperative scheme for almost any topological position of the relaying SUs.