Hybrid Linearization of Broadband Radio-Over-Fiber Transmission

Xie, Xiaoran; Hui, Ming; Liu, Taijun; Zhang, Xiupu

doi:10.1109/lpt.2018.2812745

Cited by 15 publications

(9 citation statements)

References 14 publications

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“…Adaptive feedforward often is a viable alternative to DPD in the case of working with broadband signals, since DPD also faces the problem of expensive ADC and DAC converters on high frequencies. Other research directions include attempts to combine analog RF linearization with lower frequency DPD linearization [89,90]. This is a particularly promising area of research as the combination of analog and digital linearization would allow one to mitigate the shortcomings of these methodologies.…”

Section: Discussionmentioning

confidence: 99%

Linearization as a Solution for Power Amplifier Imperfections: A Review of Methods

2021

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Development of 5G networks requires a substantial increase to both spectral and power efficiency of transmitters. It is known that these two parameters are subjected to a mutual trade-off. To increase the linearity without losing power efficiency, linearization techniques are applied to power amplifiers. This paper aims to compare most popular linearization techniques to date and evaluate their applicability to upcoming 5G networks. The history of each respective linearization technique is followed by the main principle of operation, revealing advantages and disadvantages supported by concluding the latest research results. Three main groups of linearization methods currently known are feedforward, feedback, and predistortion, each with its own tradeoffs. Although digital predistortion seems to be the go-to method currently, other techniques with less research attention are still non-obsolete. А generalized discussion and a direct comparison of techniques analyzed are presented at the end of this paper. The article offers a systematic view on PA linearization problems which should be useful to researchers of this field. It is concluded that there are still a lot of problems that need to be addressed in every linearization technique in order to achieve 5G specifications.

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Section: Discussionmentioning

confidence: 99%

Linearization as a Solution for Power Amplifier Imperfections: A Review of Methods

2021

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“…The VM is eliminated in [22,23] to make the APD least complex, but for getting good ACPR improvement a large back-off is required which is the main drawback. A simple APD circuit is designed to enhance linearity in radio over fibre (RoF) transmission [24][25][26][27][28]. The PDC for RoF that neither uses VM nor uses phase shifter is reported in [24][25][26][27].…”

Section: State-of-the-art Linearisationmentioning

confidence: 99%

“…A simple APD circuit is designed to enhance linearity in radio over fibre (RoF) transmission [24][25][26][27][28]. The PDC for RoF that neither uses VM nor uses phase shifter is reported in [24][25][26][27]. In these predistorters, the non-linearity can be compensated by means of passive components and Schottky diodes.…”

Section: State-of-the-art Linearisationmentioning

confidence: 99%

Analogue predistortion lineariser control schemes for ultra‐broadband signal transmission in 5G transmitters

Gumber

Rawat

2020

IET Microwaves, Antennas & Propagation

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Analogue predistorter (APD) has gained a new significance due to the need for high bandwidth in the fifth generation (5G) communication. As predistorted signal is generated in the analogue domain, it is free from data converter bandwidth limitation and presents an attractive linearisation solution for power amplifier (PA) in the 5G base station. Furthermore, it also finds its application in the multicarrier repeater system for long‐distance communication, where the baseband information is not readily available. However, the performance of the conventional APD is dependent on the appropriate control of gain and phase of the predistorted signal. The state‐of‐the‐art work in analogue linearisation solutions mostly utilises vector multiplier for such a control. This work points out the limitations of such a scheme and proposes a novel control scheme (CS) that is capable of extracting better benefits of the APD. An experimental validation is carried out by linearising 10 W HMC8500 broadband GaN PA, excited by a eight‐component carrier 160 MHz ultra‐broadband long‐term evolution signal. The proposed Type‐II CS delivers an adjacent channel power ratio of −45.05 dBc with an improvement of 18 dB, which is 4 dB better than Type‐I CS.

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“…With the rapid development of internet applications, the requirement of transmission speed is increased significantly [1], [2]. The most direct forward way to increase transmission rate is to increase the signal bandwidth.…”

Section: Introductionmentioning

confidence: 99%

Frequency multiplexing in millimeter-wave over fiber fronthaul transmission links with an InAs/InP quantum dash mode-locked laser

Xie,

Liu,

et al. 2024

Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XVII

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This work has proposed and compared several millimeter wave (mmWave) radio-over-fiber (RoF) frequency multiplexing techniques based on InAs/InP quantum dash (QD) mode locked laser (MLL). QD-MLL is capable of generating tens of highly coherent optical carriers simultaneously with same frequency difference. After heterodyne detection, the RF phase noise of QD-MLL can be as low as 15kHz. In this paper, four different RoF based mmWave frequency multiplexing architecture is proposed and compared in experimentation. The EVM of two 2GBaud/s 16-QAM mmWave signal can be as low as 7.1% after demultiplexing in the experimentation.

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Hybrid Linearization of Broadband Radio-Over-Fiber Transmission

Cited by 15 publications

References 14 publications

Linearization as a Solution for Power Amplifier Imperfections: A Review of Methods

Linearization as a Solution for Power Amplifier Imperfections: A Review of Methods

Analogue predistortion lineariser control schemes for ultra‐broadband signal transmission in 5G transmitters

Frequency multiplexing in millimeter-wave over fiber fronthaul transmission links with an InAs/InP quantum dash mode-locked laser

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