An SNR-improved Transmitter of Delta-sigma Modulation Supported Ultra-High-Order QAM Signal for Fronthaul/WiFi Applications

Zhong, Linsheng; Zou, Yang; Zhang, Shenmao; Dai, Xiaoxiao; Zhang, Jing; Cheng, Mengfan; Deng, Lei; Yang, Qi; Liu, Deming

doi:10.1109/jlt.2022.3147059

Cited by 42 publications

(10 citation statements)

References 21 publications

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“…It shows that multi-carrier OFDM signals can be applied to DSM-based MFH [24]. In our previous work, we also successfully experimentally demonstrated the digitization and transmission of 65536-QAM baseband OFDM signal with sampling rate of 1.25 GSa/s over 20-km fiber with a variant of DSM [25]. The above work proves that the DSM technique can be used for various signals including single-carrier and multi-carrier signals without any hardware modification.…”

mentioning

confidence: 57%

“…With the DSM technology, main functions of wireless fronthaul application can be fulfilled in the transmitter, and no additional components are required at the antenna side such as Mixer and digital-to-analog converters (DACs), which can facilitate maintenance and reduce system costs. Moreover, it can realize dynamic configuration only by changing the structure of the DSM modulator rather than changing the associated devices at the base band unite (BBU) side [25], [26]. Thus, applying DSM to the hybrid FSO/Wireless transmission system can significantly simplify the system structure and reduce costs.…”

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confidence: 99%

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Real-Time Experimental Demonstration of Hybrid FSO/Wireless Transmission Based on Coherent Detection and Delta-Sigma Modulation

Fan

Zhong

et al. 2022

IEEE Photonics J.

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For the fronthaul link in the fifth-generation (5G) wireless networks, optical fiber is one of the most widely used medium, owing to its large bandwidth and low transmission loss. However, in some scenarios, especially the dense urban areas, the installation of fiber optic cables is costly and difficult to establish. Alternatively, the free space optical (FSO) link can be installed easily and spans complex terrain. In this context, we propose and experimentally demonstrate a hybrid FSO/Wireless transmission system based on bandpass delta-sigma modulator and real-time coherent transponder. Advantage of the proposed technique is twofold. Firstly, coherent detection is applied to improve the system sensitivity compared to conventional direct detection. Secondly, delta-sigma modulation (DSM) is utilized to greatly simplify the wireless transmitters and to enhance the bandwidth flexibility. Over a 50-m FSO and 1-m wireless link, a 64-QAM wireless signal at 1 GHz with 500 MHz bandwidth is successfully transmitted. With 16 wavelength division multiplexing channels, the total throughput of the system is up to 24 Gb/s. Meanwhile, the error vector magnitude (EVM) of all channels is around 2.68% and 6.51%, which are demonstrated after FSO and FSO/Wireless transmission, respectively. The results meet the requirement of the third-generation partnership project release 15 with EVM value of 8% for 64-QAM. Moreover, sensitivity of the real-time coherent receiver is lower than −48 dBm under the 7% forward error correction limit with bit error rate of 3.8e-3.

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confidence: 57%

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confidence: 99%

Real-Time Experimental Demonstration of Hybrid FSO/Wireless Transmission Based on Coherent Detection and Delta-Sigma Modulation

Fan

Zhong

et al. 2022

IEEE Photonics J.

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“…According to Zhong et al 21 , the noise transfer function (NTF) and signal transfer function (STF) of the fourth-order DSM structure could be written as follows: Where f is a frequency variable, and f s is the sampling rate of DSM.…”

Section: Methodsmentioning

confidence: 99%

Device-compatible ultra-high-order quantum noise stream cipher based on delta-sigma modulator and optical chaos

Luo,

Zhang,

Dai

et al. 2024

Commun Eng

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Data security is a key feature of future communications networks. Physical layer introduces rich physical mechanisms to increase the complexity of deciphering and provides extensive protection, but faces challenges in compatibility with commercial systems. Quantum noise stream cipher (QNSC) has been proposed as a promising solution to overcome this problem by fusing the stream cryptography regime with the quantum noise masking physical mechanism. However, it has limitations in terms of digital to analog conversion and clock data synchronization of ultra-high-order ciphertext as well as flexible control of masking noise. Here we report a 147.9-Gbps device-compatible quadrature amplitude modulation (QAM) QNSC secure scheme over 75-km fiber. Thanks to delta-sigma modulator, the transmission of 220 × 220-order QAM-QNSC signal are established through the low-order digital signal. We develop a theoretical model for flexibly regulating the transmission rate and security performance. Broadband optical chaos introduces true randomness and acts on the masking noise.

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“…Higherorder QAM signal transmission requires higher signal-to-noise ratios (SNRs) and higher digital-to-analog converter (DAC) resolution. Recently, in research based on network feedforward, ultrahigh order QAM transmission has been achieved by replacing the traditional common public radio interface (CPRI) with delta-sigma modulation (DSM) technology, improving spectral efficiency [12][13][14][15][16] . DSM technology can convert highorder QAM signals to 1-bit signals for transmission, alleviating some of the problems caused by ultrahigh-order QAM transmission [13][14][15] .…”

Section: Introductionmentioning

confidence: 99%

“…Recently, in research based on network feedforward, ultrahigh order QAM transmission has been achieved by replacing the traditional common public radio interface (CPRI) with delta-sigma modulation (DSM) technology, improving spectral efficiency [12][13][14][15][16] . DSM technology can convert highorder QAM signals to 1-bit signals for transmission, alleviating some of the problems caused by ultrahigh-order QAM transmission [13][14][15] . The 1-bit quantized signals in QAM transmission are equivalent to quadrature phase shift keying (QPSK) signals, providing a higher SNR tolerance.…”

Section: Introductionmentioning

confidence: 99%

Neural network equalization based on delta-sigma modulation

Liu,

Ren,

et al. 2024

Chin. Opt. Lett.

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We propose a neural network equalization delta-sigma modulation (DSM) technique. After performing DSM on the multiorder quadrature amplitude modulation (QAM) orthogonal frequency division multiplexing (OFDM) signal at the transmitting end, neural network equalizer technology is used in the digital signal processing at receiving end. Applying this technology to a 4.6 km W-band millimeter wave system, it is possible to achieve a 1 Gbaud 8192-QAM OFDM signal transmission. The data rate reached 23.4 Gbit/s with the bit error rate at 3.8 × 10 −2 , lower than soft-decision forward-error correction threshold (4 × 10 −2 ).

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An SNR-improved Transmitter of Delta-sigma Modulation Supported Ultra-High-Order QAM Signal for Fronthaul/WiFi Applications

Cited by 42 publications

References 21 publications

Real-Time Experimental Demonstration of Hybrid FSO/Wireless Transmission Based on Coherent Detection and Delta-Sigma Modulation

Real-Time Experimental Demonstration of Hybrid FSO/Wireless Transmission Based on Coherent Detection and Delta-Sigma Modulation

Device-compatible ultra-high-order quantum noise stream cipher based on delta-sigma modulator and optical chaos

Neural network equalization based on delta-sigma modulation

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