Abstract
The optical orthogonal frequency division multiplexing (OFDM) is proven to be a most promising technology for the next-generation high-capacity and ultra-wide bandwidth 5G communication systems. 60 GHz millimeter-wave (mm-wave) frequency band is also becoming a most popular upcoming frequency spectrum due to today’s available dense frequency spectrum used for mobile, multimedia, and data communication, etc. We propose a system comprised of 60 GHz radio-over-fiber (RoF) model using optimized optical frequency quadrupling, coherent detection, channel estimation, and carrier phase correction techniques for ultra-wide bandwidth 16-quadrature amplitude modulation (QAM) OFDM baseband signal. The proposed RoF system’s outcomes have shown relatively better bit error rate (BER) of 3.1 × 10–3 to enable successful transmission of 110 Gbps data for more than 105 km optical link comprising of standard single-mode fiber (SSMF). System performance and obtained results show a potential to fulfill the requirements of 5G and cellular communication system.
Highlights
The RoF has grown expressively and achieved good technical maturity in the past 3 decades
This paper proposes a 60 GHz RoF system implementation using 16-quadrature amplitude modulation (QAM), orthogonal frequency division multiplexing (OFDM) with training and pilot symbol
It is realized with optical heterodyning, coherent detection, channel estimation and carrier phase estimation, and corrections techniques. It consists of central station (CS) which generates the optical OFDM signal at input data rate of 100 Gbps to 120 Gbps using 16-QAM modulator
Summary
The RoF has grown expressively and achieved good technical maturity in the past 3 decades. This paper proposes a 60 GHz RoF system implementation using 16-QAM, OFDM with training and pilot symbol It is realized with optical heterodyning, coherent detection, channel estimation and carrier phase estimation, and corrections techniques. It consists of central station (CS) which generates the optical OFDM signal at input data rate of 100 Gbps to 120 Gbps using 16-QAM modulator. A 60 GHz mm-wave generation is designed through the optical frequency quadrupling process In this technique, frequency multiplication of input radio frequency (RF) source over a LiNbO3 Mach-Zehnder modulator- (LiNbO3-MZM-) based linear modulation is used to produce high-frequency mmwave signal generation [23,24,25,26,27]. Where l is the OFDM symbol index and φl is the estimated phase over each OFDM symbol
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