Muhammad Basit Shahab

Muhammad Basit Shahab
The University of Newcastle, Australia · Department of Electrical Engineering

PhD

About

46
Publications
10,485
Reads
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811
Citations
Additional affiliations
March 2019 - June 2019
Kumoh National Institute of Technology
Position
  • PostDoc Position
December 2013 - September 2015
University of South Asia
Position
  • Lecturer
November 2009 - September 2013
University of Management and Technology (Pakistan)
Position
  • Lecturer
Education
September 2015 - February 2019
Kumoh National Institute of Technology
Field of study
  • Wireless Communications
October 2009 - August 2011
University of Management and Technology (Pakistan)
Field of study
  • Electrical Engineering (Telecommunications)
September 2005 - August 2009
University of Engineering and Technology, Lahore
Field of study
  • Electrical Engineering (Electronics & Telecom)

Publications

Publications (46)
Preprint
Full-text available
We consider the multi-user detection (MUD) problem in uplink grant-free non-orthogonal multiple access (NOMA), where the access point has to identify the total number and correct identity of the active Internet of Things (IoT) devices and decode their transmitted data. We assume that IoT devices use complex spreading sequences and transmit informat...
Article
Due to the increasing number of unmanned aerial vehicles (UAVs) with generally limited battery power, energy-efficient data transmission schemes with massive connectivity capabilities are required for future wireless networks. Non-orthogonal multiple access (NOMA) is a promising technique that provides such massive connectivity by allowing superpos...
Article
Full-text available
Grant‐free access has been identified as a potential solution to support massive machine‐type communications by avoiding the high signaling overhead and latency issues of existing grant‐based channel access mechanisms. Motivated by this, the work in this article proposes a simple, yet efficient, strategy to enable power domain non‐orthogonal multip...
Preprint
This paper studies the joint channel estimation and signal detection for the uplink power domain non-orthogonal multiple access. The proposed technique performs both detection and estimation without the need of pilot symbols by using a clustering technique. To remove the effect of channel fading, we apply rotational invariant coding to assist signa...
Preprint
Full-text available
We propose a joint channel estimation and signal detection approach for the uplink non-orthogonal multiple access using unsupervised machine learning. We apply the Gaussian mixture model to cluster the received signals, and accordingly optimize the decision regions to enhance the symbol error rate (SER). We show that, when the received powers of th...
Article
Uplink power domain non-orthogonal multiple access (PD-NOMA) allows multiple users to simultaneously transmit their data over the same resource block by using different power levels, which are exploited by the base station (BS) for multi-user detection (MUD). Conventional PD-NOMA receivers can perform MUD when the data streams from all the multiple...
Preprint
Due to an increasing number of unmanned aerial vehicles (UAVs) with generally limited battery power, energy efficient data transmission schemes with massive connectivity capabilities are required for future wireless networks. Non-orthogonal multiple access (NOMA) is one of the promising techniques that provide such massive connectivity by allowing...
Preprint
Full-text available
We propose a joint channel estimation and signal detection technique for the uplink non-orthogonal multiple access using an unsupervised clustering approach. We apply the Gaussian mixture model to cluster received signals and accordingly optimize the decision regions to enhance the symbol error rate (SER). We show that when the received powers of t...
Article
Full-text available
Single-carrier frequency-division multiple access (SC-FDMA) based index modulation (IM), referred here as SC-IM, allows users to implicitly transmit a part of their data bits by switching on some of their allocated subcarriers, followed by ${M}$ -ary constellation symbols transmission over the activated subcarriers. This sparse use of subcarriers...
Article
Full-text available
In this paper, role switching and power allocation schemes are proposed to tackle user mobility in non-orthogonal multiple access (NOMA) systems. A downlink transmission scenario is considered, where two highly mobile users, a cell center user and a cell edge user, are paired/served over the same channel resource using NOMA. In such high mobility s...
Article
Full-text available
In this study, joint transmission coordinated multi‐point (JT‐CoMP) is integrated with virtual user pairing based non‐orthogonal multiple access (VP‐NOMA), termed as JT‐CoMP VP‐NOMA. JT‐CoMP is a multi‐cell coordination scheme, where base stations of neighbouring cells coordinate with each other to improve the performance of their common cell edge...
Article
Full-text available
Massive machine-type communications (mMTC) is one of the main three focus areas in the 5th generation (5G) of wireless communications technologies to enable connectivity of a massive number of internet of things (IoT) devices with little or no human intervention. In conventional human-type communications (HTC), due to the limited number of availabl...
Preprint
The proliferating number of devices with short payloads as well as low power budget has already driven researchers away from classical grant-based access schemes that are notorious for their large signalling overhead as well as power-consuming retransmissions. Instead, light-weight random access protocols have been re-investigated and their through...
Preprint
In this letter, role switching and power allocation schemes are proposed to tackle user mobility in non-orthogonal multiple access (NOMA) systems. When cell center user (CCU) and cell edge user (CEU) come very close or even cross each other in NOMA pairing, channel gains of paired users violate the basic NOMA conditions. This article refers to such...
Preprint
Massive machine-type communications (mMTC) is one of the main three focus areas in the 5th generation (5G) of mobile standards to enable connectivity of a massive number of internet of things (IoT) devices with little or no human intervention. In conventional human-type communications (HTC), due to the limited number of available radio resources an...
Article
This paper evaluates the performance of a non-orthogonal multiple access (NOMA) system considering backward compatibility issue. This issue is considered by assuming that backward/legacy devices are incapable to perform successive interference cancellation (SIC), which is the baseline for NOMA systems. In a normal NOMA two-user pair between a cell...
Conference Paper
This paper focuses on user pairing (UP) and power allocation (PA) by considering an uplink Non-orthogonal multiple access (NOMA) system. In NOMA, UP and PA serve as critical factors to achieve high performance gains. In this context, channel gains of paired users and their PA factors are varied to comprehensively analyze the dynamics of UP and PA i...
Preprint
In this paper, joint transmission coordinated multipoint (JT-CoMP) is exploited by using virtual user pairing non-orthogonal multiple access (VP-NOMA), termed as JT-CoMP VP-NOMA. The technique combines both VP-NOMA for enhancing ergodic sum capacity (ESC) and JT-CoMP for inter-cell interference mitigation. To show the performance gains, ESC of a th...
Article
This paper proposes time sharing (TS) based half/full-duplex (HD/FD) cooperative non-orthogonal multiple access (CRNOMA) schemes namely TS-HD-CRNOMA and TSFD- CRNOMA to efficiently utilize the spectrum of unpaired users. A scenario with more cell edge users (CEUs) than cell center users (CCUs) is considered. Both schemes pair a CCU with multiple cl...
Article
This paper comprehensively investigates the dynamics of user pairing and power allocation (UPPA) in non-orthogonal multiple access (NOMA). The focal point of this work is to explore the effects of UPPA on capacity and bit error rate (BER) of NOMA users, thereby understanding the tradeoffs involved when UPPA is performed. These tradeoffs facilitate...
Article
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...
Article
This paper evaluates the performance of a virtual user pairing scheme that efficiently utilizes the spectrum of unpaired users in non-orthogonal multiple access (NOMA), termed as VP-NOMA. The scheme aims at utilizing the frequency bands of those users which remain unpaired due to the non-uniform distribution of users in a cellular area. We consider...
Conference Paper
Full-text available
Non-orthogonal multiple access (NOMA) is a promising candidate to be a part of the 5G wireless communications framework. This paper proposes a generalized M-users pairing scheme for a NOMA system. The goal of the proposed scheme is to make sure that maximum possible number of users are paired in a user pair. Minimum allowed channel gain difference...
Article
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...
Article
This paper proposes a novel algorithm named bandwidth adaptation by squeezing idle traffic (BASIT), which aims at reducing the video traffic in idle tabs/windows of browsers. The algorithm is based on detecting active tabs/windows in the browsers at client end. Video data on idle tabs is intelligently compressed by the server to save network bandwi...
Conference Paper
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...
Conference Paper
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...
Article
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...
Conference Paper
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...
Conference Paper
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...
Conference Paper
Full-text available
This article proposes the application of 64- Differential Amplitude and Phase Shift Keying (DAPSK) for Discrete Fourier Transform (DFT) and Discrete Wavelet Packet Transform (DWPT) based Orthogonal Frequency Division Multiplexing (OFDM) systems. Utilization of DAPSK reduces the computational complexity of the system, as it does not need any equaliz...
Article
Full-text available
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...
Article
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...
Conference Paper
Full-text available
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...
Conference Paper
Full-text available
This paper presents efficient solution to physical cell identity (PCI) assignment and conflict removal problem in 5G networks. It takes advantage from the concept of graph coloring and is quite efficient in the sense that minimum number of colors/PCIs is utilized in achieving a collision and confusion free PCI allocation throughout the network. PCI...
Conference Paper
Non-Orthogonal multiple access (NOMA) schemes are one of the potential candidates for future radio access (FRA). Conventional NOMA techniques are based on OFDM modulation due to which our system becomes vulnerable to increase peak to average power ratio (PAPR). In this paper, we have proposed application of Walsh Hadamard Transform (WHT) for power...
Conference Paper
This Paper proposes efficient channel quality indicator reporting schemes in LTE with reduced signaling overhead. Channel quality indicator values are used by the Scheduler for downlink packet scheduling and quick link adaptation. A brief review of existing channel quality indicator reporting schemes, and the effects of channel quality indicator re...
Article
Full-text available
This paper proposes neural networks based graph coloring technique to assign Physical Cell Identities throughout the self-organized 3GPP Long Term Evolution Networks. PCIs are allocated such that no two cells in the vicinity of each other or with a common neighbor get the same identity. Efficiency of proposed methodology resides in the fact that mi...
Conference Paper
Full-text available
There has been a dramatic improvisation in communication technologies during the last two decades. This in turn has evolved as a great source of strength to ideas regarding implementation of smart grids. This paper has three basic emphasis areas. At first, it presents a smart grid top to down hierarchy tree based traffic model by considering the di...
Conference Paper
Full-text available
This paper proposes neural networks based graph coloring technique to assign Physical Cell Identities throughout the self organized 3GPP Long Term Evolution Networks. PCIs are allocated such that no two cells in the vicinity of each other or with a common neighbor get the same identity. Efficiency of proposed methodology resides in the fact that mi...

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Projects

Projects (3)
Project
Massive machine-type communications (mMTC) is considered as one of the main three focus areas in 5G to enable connectivity of a massive number of Internet of things (IoT) devices with little or no human intervention. In massive IoT or mMTC (e.g., devices reporting to cloud, smart buildings, logistics tracking, and smart agriculture), some key traffic characteristics are: majorly uplink, very small transmit-data size per device, extremely high energy efficiency requirement, partially/fully autonomous communication, and most importantly sporadic transmission. Considering this huge number of devices and their diverse quality of service requirements, a dramatic shift from the current protocols, mostly designed for conventional human type communications (HTC), will be needed. It has been agreed that non-orthogonal multiple access (NOMA) should support atleast the uplink of mMTC. Considering its high energy efficiency requirements, huge number of devices, and specifically the sporadic short packet data transmission, grant-free access using NOMA is considered as a potential solution, where devices can transmit their data in an arrive and go manner without going through any prior grant-access procedure that is notorious for its high signaling overhead. To this end, the project majorly focuses on the use of grant-free uplink NOMA in massive IoT scenarios. Moreover, grant-based NOMA, integrated with other technologies, is also considered to tackle various quality of service constraints of the IoT devices.
Archived project
Data reliability is critical in NOMA and serves as bottleneck to its manifold capacity gains, as NOMA users are prone to significant interference. The focal point of this work is to explore the effects of user pairing and power allocation (UPPA) on capacity and bit error rate (BER) of NOMA users, thereby understanding the tradeoffs involved when UPPA is performed. These tradeoffs facilitate the design of UPPA strategies to maximize system capacity and satisfy individual target data rates of users without exceeding their allowed BER upper bounds to meet the strict data reliability constraints. The existing UPPA strategies focusing on capacity maximization or user fairness completely neglect this extremely critical tradeoff. This project focuses on providing extensive analysis and results of UPPA considering individual/sum capacity and BER of users. The process of performing UPPA by using the analysis and results, such that both capacity and data reliability goals can be simultaneously achieved, is the key objectiv.e.
Project
This project deals with the design and performance evaluation of Radio Access Technologies (RATs) that are possible candidates for beyond 5G/6G and Future Radio Access (FRA) The key technologies under our focus (but not limited to) are outlined below: 1. Non-orthogonal Multiple Access (NOMA) 2. Massive MIMO 3. Orbital Angular Momentum (OAM) 4. Reconfigurable Intelligent Surface (RIS) 5. Index Modulation (IM) 6. Full Duplex