Code-Aided Modulation Classification Algorithm for Multiuser Uplink SC-FDMA Systems

Marey, Mohamed; Mostafa, Hala

doi:10.1109/lwc.2021.3056453

Cited by 7 publications

(2 citation statements)

References 15 publications

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“…Herein lies the significance of AMA algorithms at receivers, since they have to know the kind of modulations used in order to decode the supplied data. Adaptive modulation is adopted in a number of current wireless technologies, such as cellular systems, microwave transmissions, satellites and wireless local area networks [ 7 , 8 ]. The likelihood-based (LB) and feature-based (FB) approaches are the most often used in the field of AMA [ 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Modulation Awareness Method for Dual-Hop Cooperative Transmissions over Frequency-Selective Channels

Marey

Mostafa

2022

Sensors

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Modulation awareness and cooperative transmissions have individually received a significant amount of research in the scholarly literature. However, a limited number of works are principally concerned with the combination of the two topics, and they are restricted to frequency-flat wireless channels. In this study, we propose a new modulation awareness method applicable to dual-hop amplify-and-forward cooperative broadcasts. The suggested method is built on the creation of theoretical representations of cross-correlation functions of the received signals. We conceptually prove that a family of modulation types generates spikes for certain cross-correlation functions, while others do not. We create a numerous layer hypothesis evaluation for the purpose of making judgments centered on this attribute. The suggested method has a number of benefits, such as the ability to operate on both frequency-flat and frequency-selective channels, as well as the absence of the necessity of channel awareness or noise power. Computer simulations analyze the performance of the proposed method, which delivers adequate awareness performance in a variety of operational scenarios.

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Section: Introductionmentioning

confidence: 99%

Modulation Awareness Method for Dual-Hop Cooperative Transmissions over Frequency-Selective Channels

Marey

Mostafa

2022

Sensors

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“…This requires a channel decoder reboot, which substantially increases the sophistication of the data processing. For this reason, we used the embedded estimating strategy [58,69] to eliminate this complication cost. When H (k)…”

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confidence: 99%

IQM Mitigation Algorithm with Channel Awareness for Upstream SC-FDMA Systems in the Context of Dual-Hop Broadcasts

2023

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A challenging issue for single carrier frequency division multiple access (SC-FDMA) transmissions is in-phase and quadrature-phase mismatch (IQM). There has been prior reporting on this issue; however, it has always been in the setting of single-hop broadcasts. This study explored the problem of IQM in multiple users upstream SC-FDMA networks within the framework of amplify-and-forward (AF) dual-hop transmissions. We got closer to realistic scenarios by supposing that each node in the network creates its own IQM. Moreover, we profited from the channel decoders that are included in most wireless standards to provide a valuable aid to the offered estimator. A mathematical analysis revealed that IQM originating from all nodes can be merged into channel coefficients to provide so-called effective channel coefficients. This eliminates the requirement for a chain of algorithms to be employed at each node to estimate and adjust for IQM, as well as the algorithms needed to evaluate channel coefficients between the base station and each node in the network. A theoretical investigation showed that the maximum likelihood (ML) solution to the effective channel coefficients estimation is too complicated to be applied in reality. Alternatively, we employed a simple methodology relying on the space-alternating generalized expectation maximization (SAGE) process to determine the ML predictions of the required parameters. The proposed approach incorporates a feedback loop in which the estimator and the channel decoder exchange information to boost one another’s efficiency. Furthermore, we detail how to execute data detection by making use of the predicted effective channel coefficients. The simulation results verify the effectiveness of the proposed approach and show that it outperforms the current methods.

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Power of Error Correcting Codes for SFBC-OFDM Classification Over Unknown Channels

Marey

Mostafa

2022

IEEE Access

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The development of intelligent radios in wireless applications is mainly driven by the growing need for higher data rates, along with constrained spectrum resources. An intelligent radio is one that can autonomously assess the communication environment and automatically update the communication parameters to achieve optimal performance. The problem of determining the type of space-frequency block coding (SFBC) for orthogonal frequency division multiplexing (OFDM) transmissions is one of the main tasks of an intelligent receiver. Previous approaches to this problem are restricted to uncoded communications; nevertheless, existing systems typically utilize error-correcting codes. This study develops a maximum-likelihood (ML) classifier that discriminates among SFBC-OFDM signals using the soft outputs of a channel decoder. The mathematical analysis shows that the maximization of the likelihood function can be carried out by employing an iterative expectation-maximization (EM) procedure. A channel estimator is also included in the proposed classifier as a vital step. The findings show that the classification performance of the proposed algorithm is considerably better than the classical classifiers reported in the literature, at the cost of an acceptable increase in computing complexity.

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Code-Aided Modulation Classification Algorithm for Multiuser Uplink SC-FDMA Systems

Cited by 7 publications

References 15 publications

Modulation Awareness Method for Dual-Hop Cooperative Transmissions over Frequency-Selective Channels

Modulation Awareness Method for Dual-Hop Cooperative Transmissions over Frequency-Selective Channels

IQM Mitigation Algorithm with Channel Awareness for Upstream SC-FDMA Systems in the Context of Dual-Hop Broadcasts

Power of Error Correcting Codes for SFBC-OFDM Classification Over Unknown Channels

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