Nonlinear Effects of Radio over Fiber Transmission in Base Station Cooperation Systems

Ribeiro, Franclim R.; Guerreiro, João; Dinis, Rui; Cercas, Francisco; Silva, Adão; Pinto, Armando N.

doi:10.1109/glocomw.2017.8269172

Cited by 4 publications

(2 citation statements)

References 13 publications

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“…Analyzing the F k matrix size in equation (17), it is clear that the matrix order increases according to the number of retransmissions (R × R), which is not computationally practical. Authors from [28], and [29] demonstrate that it is possible to reduce the matrix order from R × R to C × C where C << R by associating the matrix [IA − BD] with its inverse M M −1 in both ways M −1 M . The result of the proposed matrix is D −1 B(I + AD −1 B) −1 .…”

Section: ) Non-linear Equalizationmentioning

confidence: 99%

Increasing Reliability on UAV Fading Scenarios

et al. 2022

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Unmanned aerial vehicles (UAVs) are the next technology to be incorporated into a telecommunications network to improve command and control on a large scale in both lines of sight (LOS) and non-line of sight (NLOS) conditions. However, there is still room for improvement in terms of reliability. This paper investigates Constant Packet Combining (CPC) and Adaptive Packet Combining (APC) techniques applied to Unmanned Aerial Vehicle (UAV) communication in the presence of largescale fading, where the channels are subject to sudden degradation for long periods due to obstructions. We use Single Carrier (SC) Frequency Domain Equalization (FDE) combined with the Iterative Block Decision-Feedback Equalizer (IB-DFE) to handle command and control messages map for UAV use cases. We present closed-form equations for the equalization design and for the perfornance parameters such as Bit Error Rate (BER), the Packet Error Rate (PER), the throughput, the retransmissions amount, the goodput (the transmission rate without the retransmissions quantity), and the outage probability. Then, we analyze the system performance using correlated, independent, and equal channels. There is a trade-off between the overall available power, throughput, and reliability , for instance, more retransmissions result in higher reliability and power consumption and lower goodputs (effective data rates). CPC validates the transmission system and confirms the improvement in BER and PER parameters without energy efficiency optimization. The APC is appealing because it can reduce the number of retransmissions for all channels used with the advantage of meeting energy efficiency requirements by adapting the overall power to the scenario experienced by the UAV.

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Section: ) Non-linear Equalizationmentioning

confidence: 99%

Increasing Reliability on UAV Fading Scenarios

et al. 2022

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“…The photo currents I 1 (t) and I 2 (t) from the BPD1 and BPD2 contain the information carried by channel 1. Further processing the currents through DSP, the information 1 and information 2 are recovered

\begin{matrix} lefttrue \\ I_{1} (t) = 2 R \sqrt{E_{c_{1}} E_{{OLO}_{1}}} cos (\frac{π {\overset{false\to}{S}}_{{italicinformation}_{1}} ((), t)}{2 V_{180^{\circ}, {MZM}_{1}}}) cos (ω_{c} - ω_{{OLO}_{1}} \\ + {normalΦ}_{c_{1}} - {normalΦ}_{{OLO}_{1}} + \frac{π {\overset{S}{true}}_{{information}_{2}} (t)}{2 V_{180^{\circ}, {italicPM}_{1}}}) \end{matrix},

\begin{matrix} lefttrue \\ I_{2} (t) = 2 R \sqrt{E_{c_{1}} E_{{OLO}_{1}}} cos (\frac{π {\overset{false\to}{S}}_{{italicinformation}_{1}} ((), t)}{2 V_{180^{\circ}, {MZM}_{1}}}) sin (ω_{c} - ω_{{OLO}_{1}} \\ + {normalΦ}_{c_{1}} - {normalΦ}_{{OLO}_{1}} + \frac{π {\overset{S}{true}}_{{information}_{2}} (t)}{2 V_{180^{\circ}, {italicPM}_{1}}}) \end{matrix} .

…”

Section: Principle Of Operationmentioning

confidence: 99%

Coherent full duplex radio over fiber system with multiple signal transmission

Chandrasenan

Zacharias

2018

Micro & Optical Tech Letters

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In this paper, a cost‐effective and simple full duplex RoF (radio over fiber) system is developed from a simplex coherent RoF. At the transmitter, utilizing the magnitude and phase of the vector carrier, four different information are encoded simultaneously on the carrier light wave. Dividing the total carrier power into two branches, enable the transmitter to modulate two distinct information on each branch. The working of the system is described in two main sections namely uplink section and downlink section. In the first section, encoding of uplink transmitting information and decoding downlink information at the central office (CO) is described. In the second section, modulating downlink transmitting information and demodulating coherently the uplink receiving information at the base station (BS) are described. An algorithm based on fast Fourier transform is described for effectively canceling the phase noise (PN) at the BS. Considering the cost of optical components, the source used to coherently detect the uplinked transmitted information, is again used as the carrier for downlink. Altogether, this system enables to transmit three different information on uplink and are faithfully received at the BS with an average of log(BER) value −23 dB. And for downlink, one information is transmitted and is successfully received at the CO with log(BER) of −9 dB. About 10 dB decrease in log(BER) values was found after the cancellation of PN.

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Design and analysis of full duplex RoF system with efficient phase noise cancellation from a coherent RoF system

Chandrasenan¹,

Zacharias²

2021

Journal of Optical Communications

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A energy efficient and high throughput bi directional radio over fiber (RoF) system is designed and analysed. In order to preserve the phase and the magnitude of the transmitted signals, coherent detection (CD) is employed and hence an optical local oscillator (OLO) source is used. A full duplex system is designed by utilising the same OLO. The phase noise in CD system is logically cancelled using digital signal processing techniques. 10 Gb/s 16-QAM at 5.5 GHz, 10 Gb/s 2-QAM at 2.5 GHz , 5 Gb/s QPSK at 5.5 Ghz and 10 Gb/s 4-QAM at 7.5 GHz are transmitted simultaneously over 25 km optical fiber(OF). It is analysed that any coherent RoF system can be designed to a full duplex system with acceptable log(BER) and error vector magnitude(EVM) values. The minimum values of log(BER) values obtained for 16-QAM, QPSK, 2-QAM and 4-QAM are −10, −8, −16 and −22, respectively.

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Nonlinear Effects of Radio over Fiber Transmission in Base Station Cooperation Systems

Cited by 4 publications

References 13 publications

Increasing Reliability on UAV Fading Scenarios

Increasing Reliability on UAV Fading Scenarios

Coherent full duplex radio over fiber system with multiple signal transmission

Design and analysis of full duplex RoF system with efficient phase noise cancellation from a coherent RoF system

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