A Line Coding for Digital RF Transmitter Using a 1-Bit Band-Pass Delta-Sigma Modulator

Maehata, Takashi; Kameda, Suguru; Suematsu, Noriharu

doi:10.1587/transcom.2017ebp3393

Cited by 7 publications

(4 citation statements)

References 10 publications

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“…This quantization noise is determined by the resolution of the signal amplitude, which depends on the number of bits in the DAC. Oversampling technique is useful to solve the quantization noise problem and 1-bit bandpass delta-sigma modulation was introduced (Breyne et al, 2017;Dinis et al, 2017;Frappe et al, 2009;Jayaraman et al, 1997;Keyzer et al, 2001;Maehata et al, 2013Maehata et al, , 2016Sezgin et al, 2019). This technique enables to reduce the quantization noise near carrier by noise shaping.…”

Section: Direct Digital Rf Modulatormentioning

confidence: 99%

“…Since these systems require independent transceiver for each antenna element, compact and low cost transceiver with optical fiber feed becomes a key issue. Digital RF technology has been developed and applied to below 6 GHz wireless applications (Breyne et al., 2017; Dinis et al., 2017; Frappe et al., 2009; Jayaraman et al., 1997; Keyzer et al., 2001; Maehata et al., 2013, 2016; Mitola, 1995; Sezgin et al., 2019). By replacing RF analog circuit blocks with digital signal processing, a digital rich and small transceiver can be realized.…”

Section: Introductionmentioning

confidence: 99%

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Direct Digital RF Transceiver Technology for Millimeter‐Wave DBF Systems

Suematsu

2024

Radio Science

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Digital RF technology has been developed and has been applied to below 6 GHz wireless applications. By replacing the IC die consumptive RF/analog circuit blocks by digital signal processor and circuit, digital rich/small transceivers can be realized. Since the foundation of this technology is based on the Nyquist theory, the operational frequency of the circuit has been limited by the Nyquist frequency (=1/2 of sampling clock frequency). As a result, the maximum operational RF frequency of existing digital RF technology was below 6 GHz. In this paper, a new direct digital RF technology that utilizes the higher‐order Nyquist zones is introduced. This technology enables handling RF signal in beyond Nyquist frequency range which means over 6 GHz range. The results of fabricated 26/28 GHz‐band transmitter/receiver are reviewed. Since the transceiver architecture with the proposed technologies does not require an RF local oscillator and up/down converters, it is suitable for microwave/millimeter‐wave multi‐antenna systems such as next generation satellite on‐board digital beam forming and Beyond 5G fully digital Massive multiple‐input multiple‐output systems.

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Section: Direct Digital Rf Modulatormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Direct Digital RF Transceiver Technology for Millimeter‐Wave DBF Systems

Suematsu

2024

Radio Science

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“…The proposed modulator surpasses the agility of current state of the art modulators. The BP-DSM in [4]- [16], [23] can change carrier frequency, without changing output data rates, and [11]- [13] and [23] can output concurrent multicarrier transmissions. However, conventionally, the NTF of concurrent multicarrier must design the frequency response of NTF in both in-band and out-band to keep the stability in the feedback loop [17], [24]- [31], meaning, each band cannot be designed independently.…”

Section: Y Xmentioning

confidence: 99%

Time Division Multiplexing for 1-bit Bandpass Delta-Sigma Modulator

Maehata,

Suematsu

2024

Preprint

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“…1, converts a quadrature modulated signal into a high-speed 1-bit digital train. The data rate of the train can be set independently of the carrier frequency, thereby achieving concurrent multicarrier transmissions [22]- [24] such as intercarrier aggregation, and is being considered for radio on fiber (RoF) [28] and next generation base stations [29]. The carrier frequency can be placed anywhere within the first Nyquist zone as defined by data rate, while keeping the same data rate and SNR.…”

Section: Introductionmentioning

confidence: 99%

Wideband 1-Bit Bandpass Delta Sigma Modulator Using Elliptic Filter in Noise Transfer Function

Maehata

Suematsu

2022

IEEE Access

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A 1-bit band-pass delta-sigma modulator (BP-DSM), which utilizes oversampling technology, allows a modulated signal to be directly output by using a high-speed 1-bit digital pulse train, thus realizing miniaturization of transmitters. For 1-bit BP-DSM, the noise transfer function (NTF) is used to suppress quantization noise power in the transmission band and a guideline of out-of-band gain of |NTF|< 1.5 is used to prevent oscillation. However, in previous studies, such as Butterworth and inverse Chebyshev filters, the out-of-band gain was designed indirectly by tuning the zeros and poles in the transmission band and thus, was not stabilized sufficiently. Furthermore, even though the zeros of the NTF are identical to the poles of the loop filter, there are still widely used designs in which the zeros are set on the unit circle, making stabilization quite difficult. Therefore, in this paper, we propose a feasible implementation of the NTF for 1-bit BP-DSM with an elliptic filter that can be used to set not only in-band but also out-of-band gain, in which both the zeros and poles are set inside the unit circle. As a design result, a modulation bandwidth of 400 MHz as a relative bandwidth of 11%, a noise suppression bandwidth of 800 MHz, and an adjacent channel leakage power ratio of 50 dB were achieved at a center frequency of 3.6 GHz, enabling a wider bandwidth and higher SNR than before by improving the stability.INDEX TERMS Delta-sigma modulator, quantization, 5G mobile communication, software defined radio, wideband.

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A Line Coding for Digital RF Transmitter Using a 1-Bit Band-Pass Delta-Sigma Modulator

Cited by 7 publications

References 10 publications

Direct Digital RF Transceiver Technology for Millimeter‐Wave DBF Systems

Direct Digital RF Transceiver Technology for Millimeter‐Wave DBF Systems

Time Division Multiplexing for 1-bit Bandpass Delta-Sigma Modulator

Wideband 1-Bit Bandpass Delta Sigma Modulator Using Elliptic Filter in Noise Transfer Function

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