A Scheme to Support Concurrent Transmissions in OFDMA Based Ad Hoc Networks

Xiong, Hongyi; Bodanese, Eliane

doi:10.1109/vtcfall.2012.6399296

Cited by 4 publications

(2 citation statements)

References 8 publications

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“…OFDMA can be used to overcome this limitation. Using of OFDMA for ad-hoc networks is investigated by several studies in [9], [10]. In [11], [13], [28], various aspects of OFDMA is discussed.…”

Section: Related Workmentioning

confidence: 99%

OEC-MAC: A Novel OFDMA Based Efficient Cooperative MAC Protocol for VANETS

2020

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In vehicular ad hoc networks (VANETs), mobility between vehicles can cause rapid topology changes with frequent disconnections, which result in collisions and packet losses that make communications unstable. Alternatively, cooperative transmission can increase the reliability of communication by eliminating these problems in VANETS. In heavy traffic conditions, carrier sense multiple access with collision avoidance (CSMA/CA) suffers from collision, and it is not effective when high data rate is required. Therefore, orthogonal frequency division multiple access (OFDMA) is proposed. With the use of OFDMA, throughput is increased and delay is decreased by reducing the probability of collision in high traffic scenario. In this study, a novel OFDMA based efficient cooperative MAC protocol (OEC-MAC) is proposed for VANETs. Subcarrier channels assignment and access mechanisms are provided. The mechanism is presented not only for choosing the appropriate transmission mode but also for selecting the optimum relay. New control messages are defined to support cooperative communication. The performance of OEC-MAC protocol is examined by providing analytical analysis based on Markov chain model. Numerical results are demonstrated, which reveal that OEC-MAC protocol ensures a remarkable increase in throughput and also satisfies the strict delay requirement of 100 ms in VANETs for safety messages (sm). In addition, communication reliability is increased by reducing the packet dropping rate (PDR). Numerical results are compared with existing protocols, and a quantitative comparison is provided. It has been seen form results that proposed OEC-MAC protocol is better than existing schemes, especially under heavy traffic scenarios.

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Section: Related Workmentioning

confidence: 99%

OEC-MAC: A Novel OFDMA Based Efficient Cooperative MAC Protocol for VANETS

2020

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“…The research to achieve timing and carrier synchronization in OFDMA uplink communication systems is summarized in Table XIII. All categorized papers study carrier synchronization only [305,307,308,309,310,311,312,313,314,315,316,324,325,326,327,328,329,330,331,332,333,334,335,336,337,338,339]. Though they consider the same channel model, they differ in respect of providing joint channel estimation, requiring pilot/training, proposing estimation or compensation of multiple CFO, or providing lower bound.…”

Section: B Ofdma Uplink Communication Systemsmentioning

confidence: 99%

Timing and carrier synchronization in wireless communication systems: a survey and classification of research in the last 5 years

Nasir

Durrani

Mehrpouyan

et al. 2016

J Wireless Com Network

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Timing and carrier synchronization is a fundamental requirement for any wireless communication system to work properly. Timing synchronization is the process by which a receiver node determines the correct instants of time at which to sample the incoming signal. Carrier synchronization is the process by which a receiver adapts the frequency and phase of its local carrier oscillator with those of the received signal. In this paper, we survey the literature over the last 5 years (2010)(2011)(2012)(2013)(2014) and present a comprehensive literature review and classification of the recent research progress in achieving timing and carrier synchronization in single-input single-output (SISO), multiple-input multiple-output (MIMO), cooperative relaying, and multiuser/multicell interference networks. Considering both single-carrier and multi-carrier communication systems, we survey and categorize the timing and carrier synchronization techniques proposed for the different communication systems focusing on the system model assumptions for synchronization, the synchronization challenges, and the state-of-the-art synchronization solutions and their limitations. Finally, we envision some future research directions.

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