3 citations · 6 across the 14 of their papers we have counts for
14 papers
Near-field channel estimation via wavefront parameterization
Heedong Do, Namyoon Lee, Angel Lozano
This paper deals with the estimation of multiantenna channels in the line-of-sight conditions that are prevalent in the near field. By expressing the curved wavefront as a polynomi…
Cramer-Rao Bound for Arbitrarily Constrained Sets
Heedong Do, Angel Lozano
This paper presents a Cramer-Rao bound (CRB) for the estimation of parameters confined to an arbitrary set. Unlike existing results that rely on equality or inequality constraints,…
Beamforming Gain with Nonideal Phase Shifters
Heedong Do, Angel Lozano
This research sets forth a universal framework to characterize the beamforming gain achievable with arbitrarily nonideal phase shifters. Precisely, the maximum possible shortfall r…
Optimum Discrete Beamforming via Minkowski Sum of Polygons
Heedong Do, Angel Lozano
This letter casts the problem of optimum discrete beamforming as the computation of the Minkowski sum of convex polygons, which is itself a convex polygon. The number of vertices o…
Transformer-Based Nonlinear Transform Coding for Multi-Rate CSI Compression in MIMO-OFDM Systems
Bumsu Park, Heedong Do, Namyoon Lee
We propose a novel approach for channel state information (CSI) compression in multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems, where…
Multidimensional Polynomial Phase Estimation
Heedong Do, Namyoon Lee, Angel Lozano
An estimation method is presented for polynomial phase signals, i.e., those adopting the form of a complex exponential whose phase is polynomial in its indices. Transcending the sc…
Multi-Rate Variable-Length CSI Compression for FDD Massive MIMO
Bumsu Park, Heedong Do, Namyoon Lee
For frequency-division-duplexing (FDD) systems, channel state information (CSI) should be fed back from the user terminal to the base station. This feedback overhead becomes proble…
Hybrid Arrays: How Many RF Chains Are Required to Prevent Beam Squint?
Heedong Do, Namyoon Lee, Robert W. Heath +1
With increasing frequencies, bandwidths, and array apertures, the phenomenon of beam squint arises as a serious impairment to beamforming. Fully digital arrays with true time delay…
On the Learning of Digital Self-Interference Cancellation in Full-Duplex Radios
Jungyeon Kim, Hyowon Lee, Heedong Do +5
Full-duplex communication systems have the potential to achieve significantly higher data rates and lower latency compared to their half-duplex counterparts. This advantage stems f…
Finding Globally Optimal Configuration of Active RIS in Linear Time
Heedong Do, Namyoon Lee
This paper presents an algorithm for finding the optimal configuration of active reconfigurable intelligent surface (RIS) when both transmitter and receiver are equipped with a sin…
Terahertz Line-Of-Sight MIMO Communication: Theory and Practical Challenges
Heedong Do, Sungmin Cho, Jeonghun Park +3
A relentless trend in wireless communications is the hunger for bandwidth, and fresh bandwidth is only to be found at ever-higher frequencies. While 5G systems are seizing the mmWa…
Reconfigurable ULAs for Line-of-Sight MIMO Transmission
Heedong Do, Namyoon Lee, Angel Lozano
This paper establishes an upper bound on the capacity of line-of-sight multiantenna channels over all possible antenna arrangements and shows that uniform linear arrays (ULAs) with…
Soft-Output Detection Methods for Sparse Millimeter Wave MIMO Systems with Low-Precision ADCs
Yo-Seb Jeon, Heedong Do, Song-Nam Hong +1
The use of low-precision analog-to-digital converters (ADCs) is a low-cost and power-efficient solution for a millimeter wave (mmWave) multiple-input multiple-output (MIMO) system…
On the Capacity of MISO Channels with One-Bit ADCs and DACs
Yunseo Nam, Heedong Do, Yo-Seb Jeon +1
A one-bit wireless transceiver is a promising communication architecture that not only can facilitate the design of mmWave communication systems but also can extremely diminish pow…