Sub-Carrier-Multiplexed Duplex 64-QAM Radio-over-Fiber Transmission for Distributed Antennas

Ghafoor, Salman; Hanzo, Lajos

doi:10.1109/lcomm.2011.101711.111794

Cited by 24 publications

(15 citation statements)

References 9 publications

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“…Then, the optical signal is transmitted through the optical fiber to the RAP and photodetected. Subsequently, the upconverted photo-detected signal at f R F Hz can be extracted by a filter, 7 as detailed later in this section [68], where…”

Section: A Optical Upconversion Using the Non-linearity Of The Mzmmentioning

confidence: 99%

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Millimeter-Wave Radio Over Fiber Optical Upconversion Techniques Relying on Link Nonlinearity

Thomas

El‐Hajjar

Hanzo

2016

IEEE Commun. Surv. Tutorials

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Abstract-A study of advanced upconversion techniques used in radio over fiber (ROF) is provided. With the huge increase in both the number of wireless communication subscribers and the bandwidth required per customer, migrating to higher frequencies, i.e., from lower radio frequency to millimeter-wave carriers, is an essential solution. However, due to the short propagation range of millimeter waves, a large number of radio access points are required for providing reliable coverage, which would increase the infrastructure costs. Hence, the transmission of RF signals between the central (or control) points and radio access points (or remote antenna units) using optical fibers is one of the major access network solutions that have been proposed for future high-bandwidth wireless communication systems. In this paper, we introduce the basics of ROF communication, including optical modulation, the optical channel, and the optical detection techniques. Then we survey the family of advanced optical upconversion techniques that exploit the nonlinearity of the ROF link. Specifically, we describe how optical upconversion can be achieved by exploiting the Mach-Zehnder modulator's nonlinearity, wavelength conversion techniques, or the photodetector's nonlinearity. The wavelength conversion techniques rely on the nonlinearities present in the fiber, in the optical amplifier, or in the electroabsorption modulator. Index Terms-Radio over fiber, direct modulation, external modulation, direct photo-detection, coherent photo-detection, mach zehnder modulator, cross phase modulation, self phase modulation, four wave mixing, stimulated raman scattering, stimulated brillouin scattering, optical frequency modulation, optical phase modulation, optical intensity modulation, optical single side band modulation, optical double side band modulation, optical carrier suppression modulation, sub carrier multiplexing, wavelength division multiplexing, optical N-tupling, optical upconversion, semiconductor optical amplifier, electro-absorption modulator, mach zehnder interferometer, highly nonlinear dispersion shifted fiber, nonlinear optical loop mirror, millimeter wave, 5G, microwave photonics.

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Section: A Optical Upconversion Using the Non-linearity Of The Mzmmentioning

confidence: 99%

“…Again, the ROF architecture of Fig. 2 is also referred to as a DAS [7]. 2) The optical fiber is characterised by large bandwidths, which can be exploited using the suite of techniques presented in this paper.…”

mentioning

confidence: 99%

Millimeter-Wave Radio Over Fiber Optical Upconversion Techniques Relying on Link Nonlinearity

Thomas

El‐Hajjar

Hanzo

2016

IEEE Commun. Surv. Tutorials

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“…The same condition is true for the dual-drive MZM of Fig. 8(b), along with the additional condition that there should be a phase difference of π between the RF signals V 1 (t) and V 2 (t) in Equation (5).…”

Section: A Optical Intensity Modulationmentioning

confidence: 86%

“…One of the major access network solutions for future highbandwidth wireless communication systems is based on optical fibers for the transmission of radio signals between the Base Station (BS) and RAPs, which is generally referred to as a Radio Over Fiber (ROF) solution [2], [3], [4], [5], [6]. Fig.…”

Section: Introductionmentioning

confidence: 99%

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Performance Improvement and Cost Reduction Techniques for Radio Over Fiber Communications

Thomas

El‐Hajjar

Hanzo

2015

IEEE Commun. Surv. Tutorials

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141

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Abstract-Advanced cost reduction and performance improvement techniques conceived for Radio Over Fiber (ROF) communications are considered. ROF techniques are expected to form the backbone of the future 5G generation of wireless networks. The achievable link performance and the associated deployement cost constitute the most salient metrics of a ROF architecture. In this paper, we commence by providing a rudimentary overview of the ROF architecture and then elaborate on ROF techniques designed for improving the attainable system performance. We conclude by describing the ROF techniques conceived for reducing the ROF system installation costs.

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Millimeter‐wave signal generation and transmission to multiple radio access units by employing nonlinearity of the optical link

Mehmood

Ghafoor

2018

Int J Communication

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Fifth-generation communication demands seamless multi-giga-bit per second data transmission in its small-sized ultradense cells. The congestion-free millimeter-wave spectrum is the best option to be utilized for high data rate transmission. Generation and transmission of millimeter-wave signals in the electrical domain is challenging mainly owing to bandwidth limitation of electronic components. Therefore, optical generation and transmission of these high-frequency signals are a feasible option. In this work, we propose all-optical millimeter-wave signal generation and transmission in a centralized radio-over-fiber architecture. The proposed architecture performs all the major optical signal processing tasks at the central unit by eliminating the requirement of light sources and local oscillators at the multiple radio access units. Therefore, a potentially simplified and cost-effective solution for fifth-generation mobile networks is demonstrated through simulation results. Nonlinearity of the Mach-Zehnder modulator and of a highly nonlinear dispersion-shifted fiber is exploited to generate coherent optical carriers from a single centralized laser source instead of several separate laser sources. The coherent optical carriers are used to perform remote heterodyne detection at the radio access units and at the central unit to generate millimeter-wave signals. Each of the four radio access units receives data from the central unit at a rate of 512 Mbps over two subcarrier multiplexed signals. Each of the radio access unit transmits the uplink data received from the mobile units at a rate of 128 Mbps and centered at a frequency of 25 GHz. It has been demonstrated through simulations that the proposed system gives acceptable bit error rate results.

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Sub-Carrier-Multiplexed Duplex 64-QAM Radio-over-Fiber Transmission for Distributed Antennas

Cited by 24 publications

References 9 publications

Millimeter-Wave Radio Over Fiber Optical Upconversion Techniques Relying on Link Nonlinearity

Millimeter-Wave Radio Over Fiber Optical Upconversion Techniques Relying on Link Nonlinearity

Performance Improvement and Cost Reduction Techniques for Radio Over Fiber Communications

Millimeter‐wave signal generation and transmission to multiple radio access units by employing nonlinearity of the optical link

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