SSBI mitigation at 60GHz OFDM-ROF system based on optimization of training sequence

Wang, Xin; Yu, Jianjun; Cao, Zizheng; Xiao, Jiangnan; Chen, Lin

doi:10.1364/oe.19.008839

Cited by 43 publications

(10 citation statements)

References 5 publications

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“…This fact is due to the problems of non-ideal power transfer function and DC bias offsets of MZM. To achieve an accurate channel estimation, a novel TS structure design method has been proposed in our previous works [18][19], it is similar to that of Schmidl's [20] where the two halves of TS are made identical in time order by only transmitting a PN sequence on the even SCs. The TS is generated by modulating the odd SCs with BPSK symbols, while the even SCs are filled with zeros.…”

Section: Theoretical Analysismentioning

confidence: 99%

Experimental Demonstration of Real-Time High-Level QAM-Encoded Direct-Detection Optical OFDM Systems

Chen

Fan

et al. 2015

J. Lightwave Technol.

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In this paper, high-level quadrature amplitude modulation (QAM)-encoded real-time orthogonal frequency division multiplexing (OFDM) transceivers are implemented with two field programmable gate arrays (FPGAs) and high-resolution digital-to-analog converter (DAC) and analog-to-digital converter (ADC). Some key digital signal processing (DSP) algorithms for real-time direct-detection optical OFDM (DDO-OFDM) system are presented and described in detail. To improve the effective number of bits (ENOB) of ADC and reduce quantization noise, the DAC operates at 5 GS/s with an over-sampling factor of 2. Meanwhile, the optimal digital clipping ratio at the transmitter is also investigated by numerical simulation to optimize the performance of the real-time transmitter. The results show that the real-time measured BERs after 10-km SSMF are below the hard-decision forward error correction (HD-FEC) threshold of 3.8 × 10 -3 . For comparison, the off-line BER performance is also analyzed using off-line DSP approaches. It shows that there is a negligible power penalty between the off-line and real-time processing results. To the best of our knowledge, we have achieved the highest modulation format (1024-QAM) for real-time optical OFDM systems.

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Section: Theoretical Analysismentioning

confidence: 99%

Experimental Demonstration of Real-Time High-Level QAM-Encoded Direct-Detection Optical OFDM Systems

Chen

Fan

et al. 2015

J. Lightwave Technol.

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“…1,2 However, subcarrier-to-subcarrier intermixing interference (SSII) and power fading in an intensity modulation system 3,4 and subcarrier-to-subcarrier beating interference (SSBI) in a linear field modulation system 5,6 are the main bottlenecks. Therefore, DD-OFDM long-reach passive network (PON) has become one of the most promising candidates to economically build future-proof high-capacity and wide-coverage access networks.…”

Section: Introductionmentioning

confidence: 99%

Comparison of iteration interference cancellation and symbol predistortion algorithm for direct detection orthogonal frequency division multiplexing passive optical network

Liu

Chen

2015

Opt. Eng

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Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 08/23/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspxAbstract. An extensive comparison between iteration interference cancellation and symbol predistortion in an analog domain generated ratio frequency tone based virtual single sideband direct detection orthogonal frequency division multiplexing system is presented on the basis of equalization principles, computational complexity, algorithm performance, and robustness. The analysis results show that the two algorithms have the same computational complexity. Symbol predistortion is more suitable for the downstream scheme in the passive optical network, while iteration interference cancellation is suitable for the upstream scheme since, for these two scenarios, the computational complexities are both located at the optical line terminal. The numerical simulation and 40 Gbps experimental results both indicate that the iteration interference cancellation algorithm exhibits a better performance and is more robust. Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 08/23/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx Optical Engineering 086104-3 August 2015 • Vol. 54(8) Ju, Liu, and Chen: Comparison of iteration interference cancellation and symbol predistortion algorithm. . . Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 08/23/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx

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“…Conventionally, optical OFDM signals are generated based on double‐side (DSB) modulation scheme via an external MZM. But the DSB modulation signal suffers from the subcarrier signal beat interference (SSBI) [12, 13]. In order to mitigate SSBI, the single sideband (SSB) scheme is proposed.…”

Section: Introductionmentioning

confidence: 99%

Transmission of 100 GHz w‐band frequency MIMO‐OFDM signals with 90 Gbps downstream and 30 Gbps upstream using radio over fiber system

Fang¹,

Huang²,

Yang³

et al. 2012

Micro & Optical Tech Letters

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In this article, we propose and demonstrate an orthogonal frequency division multiplexing‐radio over fiber (OFDM‐ROF) system based on three channels sextupling‐frequency scheme using an external modulation of a distributed feedback laser diode (DFB‐LD) and dual drive Mach–Zehnder modulator (DD‐MZM) for carrying 100 GHz W‐band frequency multiple‐input multiple‐output (MIMO)‐OFDM signals with 90 Gbps downstream. MIMO‐OFDM algorithms effectively compensate for impairments in the wireless link. Without using costly W‐band components, a transmission system with 50 km single mode fiber (SMF) and 4 m wireless transmission operation at 100 GHz is experimentally validated. The power penalties for MIMO‐OFDM signals of base stations are less than 3 dBm. For the upstream transmission, wavelength reuse with 30 Gbps 4QAM upstream signals is experimentally demonstrated. The minimum optical spectral gap between residue downstream OFDM band and upstream OFDM band that guarantees a tolerable amount of optical interference has been determined through experiment. The frequency of local oscillator is reduced due to frequency sextupling scheme. The cost of the proposed system is largely reduced. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:93–99, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27251

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SSBI mitigation at 60GHz OFDM-ROF system based on optimization of training sequence

Cited by 43 publications

References 5 publications

Experimental Demonstration of Real-Time High-Level QAM-Encoded Direct-Detection Optical OFDM Systems

Experimental Demonstration of Real-Time High-Level QAM-Encoded Direct-Detection Optical OFDM Systems

Comparison of iteration interference cancellation and symbol predistortion algorithm for direct detection orthogonal frequency division multiplexing passive optical network

Transmission of 100 GHz w‐band frequency MIMO‐OFDM signals with 90 Gbps downstream and 30 Gbps upstream using radio over fiber system

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