- University Malaysian Perlis, Electronic Engineering Technology, Graduate Studentadd
... is the ML detection scheme achieves the optimal performance as the maximum a posteriori (MAP) detection when all ... is 4. It shows that ML method has the ability to maintain low bit error ... The QRM-ML performance degrades when M=4... more
... is the ML detection scheme achieves the optimal performance as the maximum a posteriori (MAP) detection when all ... is 4. It shows that ML method has the ability to maintain low bit error ... The QRM-ML performance degrades when M=4 at the benefit of the reduced complexity. IV. ...
Research Interests: Mathematics, Computer Science, Computational Complexity, Communication System, MIMO, and 15 moreWireless, Multiuser Detection, Multiplexing, Multi-User Detection, Spatial Multiplexing, Wireless communication systems, Spectral Efficiency, Wireless Communication, Orthogonal Frequency Division Multiplexing, MIMO System, Maximum Likelihood Method, Multiple Input Multiple Output, Minimum Mean Square Error, Space Division Multiple Access, and Multiaccess communication
Research Interests:
This study proposes two approaches for improving the effectiveness of spatial modulation integrated into layer division multiplexing (SM-LDM) in broadcasting systems: biased-power allocation (Bi-PA) and shared antenna selection (SAS).... more
This study proposes two approaches for improving the effectiveness of spatial modulation integrated into layer division multiplexing (SM-LDM) in broadcasting systems: biased-power allocation (Bi-PA) and shared antenna selection (SAS). Even though different data rates are employed in SM-LDM systems, Bi-PA enhances bit error rate (BER) fairness across layers. The ideal power ratios are adaptively determined by balancing signal-to-interference plus noise ratios with a preference for the lower layer (LL) that involves a higher modulation order. SAS alleviates the complexity of successive interference cancellation and enhances spectral and energy efficiencies. Both the LL and upper layer (UL) share the antenna selection decision and transmit using a single antenna. The UL carries a space shift keying signal while the entire power is allocated for the LL. We analyze the spectral efficiency for the SAS-based SM-LDM system with finite alphabet inputs. Numerical results demonstrate the advan...
Research Interests:
Research Interests:
Transmit Precoding (TPC) techniques based on maximizing the Minimum Euclidean Distance (MED) of the received constellation have been proposed to improve the performance of Space Shift Keying (SSK) MIMO systems. These methods have... more
Transmit Precoding (TPC) techniques based on maximizing the Minimum Euclidean Distance (MED) of the received constellation have been proposed to improve the performance of Space Shift Keying (SSK) MIMO systems. These methods have limitations, including the necessity of full Channel State Information (CSI) at the transmitter, high complexity since they generate arbitrary precoders, and the requirement of infinite rate feedback channel. On the other hand, Codebook based precoding approach have the competency to tackle these difficulties. Hence, this paper proposes Full-Combination (FC) codebook with a systematic structure constructed based on Phase Rotation Precoding (PRP) where the CSI is known to the receiver only. Also, two effective codebooks called Factorized Full-Combinations (FFC) and Statistically Filtered Full-Combinations (SFF) are designed to solve the exhaustive search problem in FC codebook needed to find the best codeword that maximizes MED. Results illustrate the consid...
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This paper considers the combination of two promising technologies: Spatial Modulation (SM) and Non-Orthogonal Multiple Access (NOMA). In contrast to the conventional Multi-Radio Frequency (M-RF) NOMA-SM model, we propose a generalized... more
This paper considers the combination of two promising technologies: Spatial Modulation (SM) and Non-Orthogonal Multiple Access (NOMA). In contrast to the conventional Multi-Radio Frequency (M-RF) NOMA-SM model, we propose a generalized Single-Radio Frequency (S-RF) model. This model splits each NOMA user data between the spatial bits and modulation bits in a flexible manner. Hence, the S-RF models in the literature are special cases of our proposed model. Besides, our model preserves the energy efficiency property of SM and strikes a compromise between the M-RF and existing S-RF models in terms of Spectrum Efficiency (SE). The SE of the proposed model is evaluated through mutual information analysis with Monte Carlo integration. Moreover, we propose a fair power allocation algorithm based on Equal Signal to Interference plus Noise Ratio (ESINR) for the NOMA-SM users. Besides, we evaluate the Bit Error Rate (BER) performance of the M-RF and S-RF NOMA-SM models and show considerable advantages of the proposed S-RF system.
Research Interests: Computer Science and NOMA
Support of multiple users in wideband powerline communication (PLC) is essential to enhance the dependence on such emerging systems. This paper presents novel adaptations of the space division multiple access (SDMA) techniques to PLC.... more
Support of multiple users in wideband powerline communication (PLC) is essential to enhance the dependence on such emerging systems. This paper presents novel adaptations of the space division multiple access (SDMA) techniques to PLC. Multicarrier data transmission and orthogonal frequency division multiple access (OFDMA) techniques are invoked to mitigate the technical challenges of PLC channel impairments and enhance the spectral efficiency. Performance is enhanced using orthogonal Walsh–Hadamard codes. Linear and nonlinear multi-user detection (MUD) schemes are investigated, including the optimal maximum likelihood (ML) methods and the near-optimal sphere detectors(SDs). Presented results indicate the potential of the proposed scheme to enhance wideband PLC systems.
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A tool is presented for achieving a near-optimum multi-user detector (MUD) based on the Genetic Algorithm (GA) techniques for Space Division Multiple Access (SDMA) Or- thogonal Frequency Division Multiplexing (OFDM) communication systems.... more
A tool is presented for achieving a near-optimum multi-user detector (MUD) based on the Genetic Algorithm (GA) techniques for Space Division Multiple Access (SDMA) Or- thogonal Frequency Division Multiplexing (OFDM) communication systems. The tool involves methods for substantially reducing the GA search space to minimize the convergence time. GA parameters are investigated and the tool is investigated for the challenging overloaded scenario problem. Results reveal that the proposed tool provides a useful compromise means between per- formance and computational complexity. Simulation outcomes indicate that the tool surpasses the conventional low complexity methods, such as the minimum mean-square error (MMSE), and approaches the optimal performance of the Maximum Likelihood (ML) detector, while maintain- ing reduced complexity.
Research Interests:
Research Interests:
A multifunctional system that performs synthetic aperture radar (SAR) and communication tasks is presented. The system depends on orthogonal frequency division multiplexing (OFDM) waveform shaping and multiple input multiple output (MIMO)... more
A multifunctional system that performs synthetic aperture radar (SAR) and communication tasks is presented. The system depends on orthogonal frequency division multiplexing (OFDM) waveform shaping and multiple input multiple output (MIMO) configuration to achieve enhancement in the spectral efficiency of communication operation and provide interference rejection in SAR imaging. The SAR interval idle time is utilized to enhance the communication signal through diversity. Adaptive system features are introduced to achieve multi-user detection and improve the communication reliability, by means of space division multiple access (SDMA) and space–time block coding (STBC). Investigations of linear and nonlinear multi-user detection (MUD) techniques are provided. Moreover, a genetic algorithm-based system is developed to optimize the MUD problem and to provide near-optimal performance even for overloaded scenarios. A gain of more than 4 dB is achieved at bit error rate of 10-2.
Research Interests:
This paper considers codebook-based precoding for Space Shift Keying (SSK) modulation MIMO system. Codebook-based precoding avoids the necessity for full knowledge of Channel State Information (CSI) at the transmitter and alleviates the... more
This paper considers codebook-based precoding for Space Shift Keying (SSK) modulation MIMO system. Codebook-based precoding avoids the necessity for full knowledge of Channel State Information (CSI) at the transmitter and alleviates the complexity of generating a CSI-optimized precoder. The receiver selects the codeword that maximizes the Minimum Euclidean Distance (MED) of the received constellation and feeds back its index to the transmitter. In this paper, we first develop a new accurate closed-form Bit Error Rate (BER) for SSK without precoding. Then, we investigate several phase-rotation codebooks with quantized set of phases and systematic structure. Namely, we investigate the Full-Combination, Walsh-Hadamard, Quasi-Orthogonal Sequences, and Orthogonal Array Testing codebooks. In addition, since the size of the Full-Combination codebook may be large, we develop an iterative search method for fast selection of its best codeword. The proposed codebooks significantly improve the ...
Research Interests:
Support of multiple users in wideband powerline communication (PLC) is essential to enhance the dependence on such emerging systems. This paper presents novel adaptations of the space division multiple access (SDMA) techniques to PLC.... more
Support of multiple users in wideband powerline communication (PLC) is essential to enhance the dependence on such emerging systems. This paper presents novel adaptations of the space
division multiple access (SDMA) techniques to PLC. Multicarrier data transmission and orthogonal frequency division multiple access (OFDMA) techniques are invoked to mitigate the technical challenges of PLC channel impairments and enhance the spectral e±ciency. Performance is enhanced using orthogonal Walsh–Hadamard codes. Linear and nonlinear multi-user detection (MUD) schemes are investigated, including the optimal maximum likelihood (ML) methods and the near-optimal sphere detectors(SDs). Presented results indicate the potential of
the proposed scheme to enhance wideband PLC systems.
division multiple access (SDMA) techniques to PLC. Multicarrier data transmission and orthogonal frequency division multiple access (OFDMA) techniques are invoked to mitigate the technical challenges of PLC channel impairments and enhance the spectral e±ciency. Performance is enhanced using orthogonal Walsh–Hadamard codes. Linear and nonlinear multi-user detection (MUD) schemes are investigated, including the optimal maximum likelihood (ML) methods and the near-optimal sphere detectors(SDs). Presented results indicate the potential of
the proposed scheme to enhance wideband PLC systems.