scholarly journals Cell-free mMIMO Support in the O-RAN Architecture: A PHY Layer Perspective for 5G and Beyond Networks

2021 ◽  
Author(s):  
Vida Ranjbar ◽  
Adam Girycki, ◽  
Md Arifur Rahman ◽  
Sofie Pollin ◽  
marc moonen ◽  
...  
Keyword(s):  
Phy Layer

<div>In this paper, we document the current O-RAN terminology and contrast it with some common CF processing approaches.</div>

scholarly journals PHY-Layer Authentication Using Duobinary Signaling for Spectrum Enforcement

2016 ◽  
Vol 11 (5) ◽  
pp. 1027-1038 ◽  
Author(s):  
Vireshwar Kumar ◽  
Jung-Min Jerry Park ◽  
Kaigui Bian
Keyword(s):  
Phy Layer

Dependency of Transport Functions on IEEE802.11 and IEEE802.15.4 MAC/PHY Layer Protocols for WSN

2012 ◽  
pp. 95-123
Author(s):  
Atif Sharif ◽  
Vidyasagar Potdar ◽  
A. J. D. Rathnayaka
Keyword(s):  
Ieee 802.11 ◽  
Power Efficiency ◽  
Ieee 802.15.4 ◽  
Transport Layer ◽  
Delivery Ratio ◽  
Additional Energy ◽  
Packet Delivery ◽  
Transport Layer Protocol ◽  
Phy Layer ◽  
Packet Drop

In WSN transport, layer protocol plays a significant role in maintaining the node’s energy budget. To find out the dependency of Transport layer on MAC/PHY layer, the authors have extensively tested various transport protocols using IEEE 802.11, IEEE 802.15.4 MAC/PHY protocols for WSN. For IEEE802.11 and IEEE802.15.4 with RTS/CTS ON the TCP variants has shown >80% packet delivery ratio and 5-20% packet loss, while for UDP it is around >63% and 19.54-35.18% respectively. On average 1-3% additional energy is consumed for packet retransmissions in IEEE 802.11 with RTS/CTS OFF whereas significant energy efficiency is observed in IEEE802.15.4 case. For IEEE 802.11 with RTS/CTS ON high throughput, low packet drop rate and increased E-2-E delay is observed, while for IEEE 802.15.4 improved power efficiency and jitter behavior is observed. This has led the foundation for the future development of the cross-layered energy efficient transport protocol for WSN.

Emerging Telecommunications Technologies

2010 ◽  
pp. 545-561
Author(s):  
J. Joaquín Escudero-Garzás ◽  
Ana García-Armada
Keyword(s):  
Game Theory ◽  
Cognitive Radio ◽  
Cognitive Radios ◽  
Next Generation Networks ◽  
The Novel ◽  
New Paradigm ◽  
Wireless Telecommunications ◽  
New Type ◽  
Phy Layer ◽  
Novel Concept

The goal of this chapter is to introduce the novel concept of cognitive radio (CR) for wireless telecommunications. Cognitive radios are a new type of radio devices that include cognition and reconfigurability features. The raising number of studies in different areas of research shows their potential and the expectation created among the telecommunications community. In this chapter, the authors first introduce the reader to the new paradigm that cognitive radio networks have created; more specifically, they explain in detail the new next generation networks. Given that our intention is to introduce cognitive radio, the authors focus on the challenges in PHY layer and MAC sublayer and the most relevant studies in these fields. Finally, the integration of game theory and cognitive radio creates a new paradigm where the advantages of both technologies merge to solve complex problems.

scholarly journals Energy and Spectrally Efficient Modulation Scheme for IoT Applications

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4382 ◽  
Author(s):  
Hany Hussein ◽  
Mohamed Elsayed ◽  
Mahmoud Fakhry ◽  
Usama Sayed Mohamed
Keyword(s):  
Low Power ◽  
Closed Form ◽  
Fading Channels ◽  
Low Cost ◽  
Superior Performance ◽  
Closed Form Expression ◽  
Modulation Scheme ◽  
Power Budget ◽  
Iot Applications ◽  
Phy Layer

Due to the Internet of Things (IoT) requirements for a high-density network with low-cost and low-power physical (PHY) layer design, the low-power budget transceiver systems have drawn momentous attention lately owing to their superior performance enhancement in both energy efficiency and hardware complexity reduction. As the power budget of the classical transceivers is envisioned by using inefficient linear power amplifiers (PAs) at the transmitter (TX) side and by applying high-resolution analog to digital converters (ADCs) at the receiver (RX) side, the transceiver architectures with low-cost PHY layer design (i.e., nonlinear PA at the TX and one-bit ADC at the RX) are mandated to cope with the vast IoT applications. Therefore, in this paper, we propose the orthogonal shaping pulses minimum shift keying (OSP-MSK) as a multiple-input multiple-output (MIMO) modulation/demodulation scheme in order to design the low-cost transceiver architectures associated with the IoT devices. The OSP-MSK fulfills a low-power budget by using constant envelope modulation (CEM) techniques at the TX side, and by applying a low-resolution one-bit ADC at the RX side. Furthermore, the OSP-MSK provides a higher spectral efficiency compared to the recently introduced MIMO-CEM with the one-bit ADC. In this context, the orthogonality between the in-phase and quadrature-phase components of the OSP are exploited to increase the number of transmitted bits per symbol (bps) without the need for extra bandwidth. The performance of the proposed scheme is investigated analytically and via Monte Carlo simulations. For the mathematical analysis, we derive closed-form expressions for assessing the average bit error rate (ABER) performance of the OSP-MSK modulation in conjunction with Rayleigh and Nakagami-m fading channels. Moreover, a closed-form expression for evaluating the power spectral density (PSD) of the proposed scheme is obtained as well. The simulation results corroborate the potency of the conducted analysis by revealing a high consistency with the obtained analytical formulas.

Game Theory for PHY Layer and MAC Sublayer in Wireless Telecommunications

2010 ◽  
pp. 804-819
Author(s):  
J. Joaquín Escudero-Garzás ◽  
Ana García-Armada
Keyword(s):  
Game Theory ◽  
Wireless Networks ◽  
Applied Mathematics ◽  
Complex Problems ◽  
Game Player ◽  
Wireless Telecommunications ◽  
Wireless Environments ◽  
Phy Layer ◽  
Novel Concept

The aim of this chapter is to address the role of a novel concept in wireless telecommunications: Game theory. Game theory is a branch of applied mathematics, which has recently drawn attention as a powerful tool to solve complex problems in wireless environments. To fulfil the intended goal, this chapter introduces the most relevant concepts of game theory such as game, player, and strategy, and give an overview of the applications of game theory in wireless networks.

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