A Millimeter-Wave Reconfigurable On-Chip Coupler With Tunable Power-Dividing Ratios in 0.13-$\mu$ m BiCMOS Technology

Yang, Yang; Hou, Zhang Ju; Zhu, Xi; Che, Wenquan; Xue, Quan

doi:10.1109/tcsi.2020.2964574

Cited by 22 publications

(5 citation statements)

References 23 publications

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“…Although there are two different index modulators cascaded together to constitute a super modulator, the basic framework of OFDM-CIM is still the same as that of OFDM-IM. For brevity, we omit the superscript of the vector in formula (15). The cascaded multiple index modulators can be treated as a super index modulator, which is similar to that of conventional OFDM-IM.…”

Section: Optimal ML Detectormentioning

confidence: 99%

“…Considering the orthogonality of the subcarriers in the subblock, the optimal ML detection can be carried out in subcarrier-wise. According to the received signal model in formula (15), the received signal model of the nth subcarrier can be expressed as…”

Section: Optimal ML Detectormentioning

confidence: 99%

“…[9][10][11][12][13][14]. Many novel techniques, such as improved OFDM, massive multiple-input multiple-output (MIMO), millimeter (mm)-wave communications, space-to-ground communications etc., are regarded as key techniques for the beyond 5G communications networks [14,15].…”

Section: Introductionmentioning

confidence: 99%

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Orthogonal frequency division multiplexing with cascade index modulation

Yang

Guo

et al. 2021

IET Communications

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As an emerging technique, index modulation (IM) can improve the system bit error rate (BER) performance due to the robustness of index bits over conventional modulated symbol bits. The existing IM aided orthogonal frequency division multiplexing (OFDM) schemes only employ one index modulator at the transmitter, which transmits a small amount of index bits in each transmission. In this paper, a novel IM technique, called cascade IM (CIM), is proposed to increase the proportion of the index bits in the transmission by combining the conventional IM with the multiple‐mode IM together. Subcarrier‐wise and subblock‐wise CIM schemes are proposed to achieve different spectral efficiency and diversity order for diverse scenarios in the next generation wireless communication networks. The optimal subcarrier‐wise maximum likelihood detector is proposed for OFDM‐CIM. To reduce the demodulation complexity, a novel tree search based and an iterative log‐likelihood ratio based detectors, which can avoid illegal index patterns in the search process, are developed for OFDM‐CIM. Monte Carlo simulations show that the proposed scheme achieves better BER performance than OFDM‐IM and appears as a competitive candidate of multi‐carrier transmission techniques for next generation wireless communication networks.

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Section: Optimal ML Detectormentioning

confidence: 99%

Section: Optimal ML Detectormentioning

confidence: 99%

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Orthogonal frequency division multiplexing with cascade index modulation

Yang

Guo

et al. 2021

IET Communications

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“…In addition, in light of today's crowded radio spectrum and the multistandard RF (radio frequency) frontends in modern telecommunication systems demanding high-performance devices, reconfigurable RF/microwave circuits have become a very important topic of research. As an essential component, various frequency-tunable [1][2][3][4][5] and power-dividing ratiotunable [6][7][8][9] quadrature couplers emerged. In [6], the coupler not only has a narrow adjustment range of powerdividing ratio but also belongs to a double-layer structure.…”

Section: Introductionmentioning

confidence: 99%

A Compact Frequency- and Power-Dividing Ratio-Tunable Quadrature Coupler

Zhang

Tan

Xiang

2023

International Journal of RF and Microwave Computer-Aided Engine

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This paper presents a compact quadrature coupler with a tunable frequency and power-dividing ratio. Wide tunable frequency and power-dividing ratio are achieved by using the novel tunable unit instead of the transmission line sections in a traditional varactor-based quadrature coupler. Closed-form equations are derived for design parameters. For verification, a quadrature coupler is designed based on the given parameters, which demonstrate the tunable frequency of 2.0 GHz to 6.0 GHz and the tunable power-dividing ratio of -20 dB to 7.2 dB at 3 GHz. Finally, a microstrip tunable quadrature coupler is fabricated and measured. The measurements agree well with simulations. Under the frequency-tunable state, the measured 3-dB working frequency of this coupler can be continuously adjusted from 2.0 GHz to 4.7 GHz. And during the adjustment process, the return loss and isolation are always >15 dB. In the power-dividing ratio-tunable state, the adjustment range of the measured power-dividing ratio is from -14 to 6.0 dB at 3 GHz. Moreover, the return loss and isolation are always maintained at >20 dB.

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“…Introduction: In the design of integrated circuits (ICs) for front-end systems, passive devices such as bandpass filters (BPFs) [1][2][3][4][5][6][7][8][9][10][11][12], power dividers [13][14][15] and couplers [16][17][18] usually occupy relatively large layout space. In order to reduce the yield cost of ICs, miniaturized design of passive devices is attracting increasing attention.…”

mentioning

confidence: 99%

A compact 60‐GHz on‐chip bandpass filter in GaAs technology

Xu,

Xi,

Liu

et al. 2024

Electronics Letters

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A compact 60‐GHz on‐chip bandpass filter (BPF) is presented using gallium arsenide (GaAs) technology. To demonstrate the working mechanism of the proposed BPF, an inductor‐capacitor (LC) equivalent circuit model is conceived and analysed for further investigation of the transmission poles (TPs) and zeros. Finally, a prototype of the BPF is fabricated and tested to validate the proposed idea, whose simulated and measured results are in good agreement. The measurements show that it has a centre frequency of 60.2 GHz with a bandwidth of 14%, and the minimum insertion loss (IL) within the passband is 2.57 dB. The chip size, excluding the feedings, is about 0.265 mm × 0.184 mm.

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A Millimeter-Wave Reconfigurable On-Chip Coupler With Tunable Power-Dividing Ratios in 0.13-$\mu$ m BiCMOS Technology

Cited by 22 publications

References 23 publications

Orthogonal frequency division multiplexing with cascade index modulation

Orthogonal frequency division multiplexing with cascade index modulation

A Compact Frequency- and Power-Dividing Ratio-Tunable Quadrature Coupler

A compact 60‐GHz on‐chip bandpass filter in GaAs technology

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