A5069831197- Advanced Photonic Communication Systems
- Advanced MIMO Systems Optimization
- Telecommunications and Broadcasting Technologies
- Full-Duplex Wireless Communications
- Power Line Communications and Noise
- Millimeter-Wave Propagation and Modeling
- Photonic and Optical Devices
- Spacecraft and Cryogenic Technologies
- Optical Network Technologies
- Radio Frequency Integrated Circuit Design
- Scientific Research and Discoveries
- Semiconductor Lasers and Optical Devices
- Advanced Power Amplifier Design
Chalmers University of Technology
2019-2024
Ericsson (Sweden)
2019-2024
Ericsson (Hungary)
2019
We present the uplink and downlink of a time-division duplex distributed multiple-input multiple-output (D-MIMO) testbed, based on 1-bit radio-over-fiber architecture, which is low cost scalable. The proposed architecture involves central unit (CU) that equipped with digital-to-analog analog-to-digital converters, operating at 10 GS/s. CU connected to multiple single-antenna remote radio heads (RRHs) via optical fibers, over binary frequency (RF) waveform transmitted. In uplink, RF generated...
Radio-over-fiber is a popular technique to establish communication links between central location and many remote antenna units. Many different architectures are available for the downlink, i.e., link from unit antennas. On contrary, low-cost low-complexity requirement of units makes it difficult devise suitable uplink, antennas unit. In this article, we address propose low-complexity, all-digital, time-division-duplex architecture. For band-pass sigma-delta-over-fiber employed. receive...
Advances in analog-to-digital converter (ADC) technology have opened up the possibility to directly digitize wideband radio frequency (RF) signals, avoiding need for analog down- conversion. In this work, we consider an orthogonal frequency- division multiplexing (OFDM)-based massive multi-user (MU) multiple-input multiple-output (MIMO) uplink system that relies on direct RF-sampling at base station and digitizes received RF signals with 1-bit ADCs. Using Bussgang's theorem, provide...
Sigma-Delta-over-Fiber and Analog-Radio-over-Fiber are compared in terms of non-linearity impairments a transmitter with external optical modulation. The results show that is more robust towards nonlinear characteristics the modulator.
We present the uplink and downlink of a time-division duplex distributed multiple-input multiple-output (D-MIMO) testbed, based on 1-bit radio-over-fiber architecture, which is low-cost scalable. The proposed architecture involves central unit (CU) that equipped with digital-to-analog analog-to-digital converters, operating at 10 GS/s. CU connected to multiple single-antenna remote radio heads (RRHs) via optical fibers, over binary RF waveform transmitted. In uplink, generated RRHs by...
We analyze the uplink performance of a distributed massive multiple-input multiple-output (MIMO) architecture in which remotely located access points (APs) are connected to central processing unit via fiber-optical fronthaul carrying dithered and 1-bit quantized version received radio-frequency (RF) signal. The innovative feature proposed is that no down-conversion performed at APs. This eliminates need equip APs with local oscillators, may be difficult synchronize. Under assumption...
We consider the problem of pilot-aided, uplink channel estimation in a distributed massive multiple-input multiple-output (MIMO) architecture, which access points are connected to central processing unit via fiber-optical fronthaul links, carrying two-level-quantized version received analog radio-frequency signal. adapt this architecture deep-learning-based channel-estimation algorithm recently proposed by Nguyen et al. (2023), and explore its robustness additional signal distortions (beyond...
A crucial challenge in the implementation of distributed massive multiple-input multiple-output (MIMO) architectures is to provide phase coherence while, at same time, limit complexity remote-radio heads (RRHs), which important for cost-efficient scalability. To address this challenge, we present paper a phase-coherent MIMO architecture, based on off-the-shelf, low-cost components. In proposed up- and down-conversion are carried out central unit (CU). The RRHs connected CU by means optical...
Advances in analog-to-digital converter (ADC) technology have opened up the possibility to directly digitize wideband radio frequency (RF) signals, avoiding need for analog down-conversion. In this work, we consider an orthogonal frequency-division multiplexing (OFDM)-based massive multi-user (MU) multiple-input multiple-output (MIMO) uplink system that relies on direct RF-sampling at base station and digitizes received RF signals with 1-bit ADCs. Using Bussgang's theorem, provide analytical...