16 citations · 26 across the 20 of their papers we have counts for
33 papers
An Open-Source Standard-Cell Library for IHP 130nm Developed by Students
Oscar Castañeda, Lavinia Recchioni, Tobias Senti +26
Standard-cell libraries form the critical interface between transistor-level circuit design and automated digital design flows, yet their design and characterization are rarely cov…
Alias-Free Oscillator Synchronization via Additive Synthesis
Jonas Roth, Domenic Keller, Oscar Castañeda +1
Oscillator synchronization is a widely used sound-synthesis technique, but straightforward digital implementations suffer from aliasing artifacts. This paper presents an alias-free…
A 39pJ/b 7.3Gbps 1.3mm Multi-Subcarrier Massive MU-MIMO-OFDM Detector Exploiting Beamspace Sparsity and Frequency-Domain Correlation in 22FDX
Abhishek Kumar, Seyed Hadi Mirfarshbafan, Oscar Castañeda +1
We present the first multi-subcarrier massive multi-user (MU) multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) data detector reported in the…
Variable Point: A Number Format for Area- and Energy-Efficient Multiplication of High-Dynamic-Range Numbers
Seyed Hadi Mirfarshbafan, Nicolas Filliol, Oscar Castañeda +1
Fixed-point number representation is commonly employed in digital VLSI designs that have stringent hardware efficiency constraints. However, fixed-point numbers cover a relatively…
A 0.32 mm 100 Mb/s 223 mW ASIC in 22FDX for Joint Jammer Mitigation, Channel Estimation, and SIMO Data Detection
Jonas Elmiger, Fabian Stuber, Oscar Castañeda +2
We present the first single-input multiple-output (SIMO) receiver ASIC that jointly performs jammer mitigation, channel estimation, and data detection. The ASIC implements a recent…
A Jammer-Resilient 2.87 mm 1.28 MS/s 310 mW Multi-Antenna Synchronization ASIC in 65 nm
Flurin Arquint, Oscar Castañeda, Gian Marti +1
We present the first ASIC implementation of jammer-resilient multi-antenna time synchronization. The ASIC implements a recent algorithm that mitigates jamming attacks on synchroniz…
A Deep-Unfolding-Optimized Coordinate-Descent Data-Detector ASIC for mmWave Massive MIMO
Zixiao Li, Seyed Hadi Mirfarshbafan, Oscar Castañeda +1
We present a 22 nm FD-SOI (fully depleted silicon-on-insulator) application-specific integrated circuit (ASIC) implementation of a novel soft-output Gram-domain block coordinate de…
A Jammer-Mitigating 267 Mb/s 3.78 mm 583 mW 328 Multi-User MIMO Receiver in 22FDX
Florian Bucheli, Oscar Castañeda, Gian Marti +1
We present the first multi-user (MU) multiple-input multiple-output (MIMO) receiver ASIC that mitigates jamming attacks. The ASIC implements a recent nonlinear algorithm that perfo…
An Aliasing-Free Hybrid Digital-Analog Polyphonic Synthesizer
Jonas Roth, Domenic Keller, Oscar Castañeda +1
Analog subtractive synthesizers are generally considered to provide superior sound quality compared to digital emulations. However, analog circuitry requires calibration and suffer…
High Dynamic Range mmWave Massive MU-MIMO with Householder Reflections
Victoria Palhares, Gian Marti, Oscar Castañeda +1
All-digital massive multiuser (MU) multiple-input multiple-output (MIMO) at millimeter-wave (mmWave) frequencies is a promising technology for next-generation wireless systems. Low…
Hybrid Jammer Mitigation for All-Digital mmWave Massive MU-MIMO
Gian Marti, Oscar Castañeda, Sven Jacobsson +3
Low-resolution analog-to-digital converters (ADCs) simplify the design of millimeter-wave (mmWave) massive multi-user multiple-input multiple-output (MU-MIMO) basestations, but inc…
Jammer Mitigation via Beam-Slicing for Low-Resolution mmWave Massive MU-MIMO
Gian Marti, Oscar Castañeda, Christoph Studer
Millimeter-wave (mmWave) massive multi-user multiple-input multiple-output (MU-MIMO) promises unprecedented data rates for next-generation wireless systems. To be practically viabl…
Beam-Slicing for Jammer Mitigation in mmWave Massive MU-MIMO
Oscar Castañeda, Gian Marti, Christoph Studer
Millimeter-wave (mmWave) massive multi-user multiple-input multiple-output (MU-MIMO) technology promises unprecedentedly high data rates for next-generation wireless systems. To be…
A Resolution-Adaptive 8 mm 9.98 Gb/s 39.7 pJ/b 32-Antenna All-Digital Spatial Equalizer for mmWave Massive MU-MIMO in 65nm CMOS
Oscar Castañeda, Zachariah Boynton, Seyed Hadi Mirfarshbafan +4
All-digital millimeter-wave (mmWave) massive multi-user multiple-input multiple-output (MU-MIMO) receivers enable extreme data rates but require high power consumption. In order to…
Resolution-Adaptive All-Digital Spatial Equalization for mmWave Massive MU-MIMO
Oscar Castañeda, Seyed Hadi Mirfarshbafan, Shahaboddin Ghajari +4
All-digital basestation (BS) architectures for millimeter-wave (mmWave) massive multi-user multiple-input multiple-output (MU-MIMO), which equip each radio-frequency chain with ded…
Analog vs. Digital Spatial Transforms: A Throughput, Power, and Area Comparison
Zephan M. Enciso, Seyed Hadi Mirfarshbafan, Oscar Castañeda +3
Spatial linear transforms that process multiple parallel analog signals to simplify downstream signal processing find widespread use in multi-antenna communication systems, machine…
Finite-Alphabet Wiener Filter Precoding for mmWave Massive MU-MIMO Systems
Oscar Castañeda, Sven Jacobsson, Giuseppe Durisi +2
Power consumption of multi-user (MU) precoding is a major concern in all-digital massive MU multiple-input multiple-output (MIMO) base-stations with hundreds of antenna elements op…
High-Bandwidth Spatial Equalization for mmWave Massive MU-MIMO with Processing-In-Memory
Oscar Castañeda, Sven Jacobsson, Giuseppe Durisi +2
All-digital basestation (BS) architectures enable superior spectral efficiency compared to hybrid solutions in massive multi-user MIMO systems. However, supporting large bandwidths…
Soft-Output Finite Alphabet Equalization for mmWAVE Massive MIMO
Oscar Castañeda, Sven Jacobsson, Giuseppe Durisi +2
Next-generation wireless systems are expected to combine millimeter-wave (mmWave) and massive multi-user multiple-input multiple-output (MU-MIMO) technologies to deliver high data-…
Finite-Alphabet MMSE Equalization for All-Digital Massive MU-MIMO mmWave Communication
Oscar Castañeda, Sven Jacobsson, Giuseppe Durisi +2
We propose finite-alphabet equalization, a new paradigm that restricts the entries of the spatial equalization matrix to low-resolution numbers, enabling high-throughput, low-power…
WrapNet: Neural Net Inference with Ultra-Low-Resolution Arithmetic
Renkun Ni, Hong-min Chu, Oscar Castañeda +3
Low-resolution neural networks represent both weights and activations with few bits, drastically reducing the multiplication complexity. Nonetheless, these products are accumulated…
Design Trade-offs for Decentralized Baseband Processing in Massive MU-MIMO Systems
Kaipeng Li, James McNaney, Chance Tarver +4
Massive multi-user (MU) multiple-input multiple-output (MIMO) provides high spectral efficiency by means of spatial multiplexing and fine-grained beamforming. However, conventional…
Siamese Neural Networks for Wireless Positioning and Channel Charting
Eric Lei, Oscar Castañeda, Olav Tirkkonen +2
Neural networks have been proposed recently for positioning and channel charting of user equipments (UEs) in wireless systems. Both of these approaches process channel state inform…
A 354Mb/s 0.37mm^2 151mW 32-User 256-QAM Near-MAP Soft-Input Soft-Output Massive MU-MIMO Data Detector in 28nm CMOS
Charles Jeon, Oscar Castañeda, Christoph Studer
This paper presents a novel data detector ASIC for massive multiuser multiple-input multiple-output (MU-MIMO) wireless systems. The ASIC implements a modified version of the large-…