18 papers
Codebook-Based Effective CSI Feedback for Precoding Design in MIMO Systems
Bikshapathi Gouda, Antti Arvola, Juha Karjalainen +2
Downlink multi-user multiple-input multiple-output (MIMO) precoding with limited channel state information (CSI) feedback in multi-cell systems is studied. Conventional codebook-ba…
Over-the-Air Beamforming Design for Full-Duplex Cell-Free Massive MIMO Systems
Bikshapathi Gouda, Antti Tölli
We study a full-duplex (FD) cell-free massive MIMO system where distributed access points (APs) operate in FD mode while user equipments (UEs) remain half-duplex. Although simultan…
SEP Analysis of Quantized SIMO Systems with M-PSK over Correlated Fading Channels
Amila Ravinath, Bikshapathi Gouda, Italo Atzeni +1
The average symbol error probability (SEP) of a phase-quantized single-input multiple-output system with M-ary phase-shift keying modulation and maximum ratio combining (MRC) is an…
SEP Analysis of a Low-Resolution SIMO System with M-PSK over Fading Channels
Amila Ravinath, Minhua Ding, Bikshapathi Gouda +2
In this paper, the average symbol error probability (SEP) of a phase-quantized single-input multiple-output (SIMO) system with M-ary phase-shift keying (PSK) modulation is analyzed…
SEP Analysis of 1-Bit Quantized SIMO Systems with QPSK over Fading Channels
Amila Ravinath, Minhua Ding, Bikshapathi Gouda +2
The average symbol error probability (SEP) of a 1-bit quantized single-input multiple-output (SIMO) system is analyzed under Rayleigh fading channels and quadrature phase-shift key…
Coordinated Multi-BS SSB Beam Design for Enhanced Initial Access Coverage
Hakime BarghiZanjani, Bikshapathi Gouda, Antti Tölli
Ensuring strong synchronization signal block (SSB) coverage is essential for reliable user equipment (UE) connection during initial access. While techniques such as power boosting…
Near-Field MIMO Channel Acquisition: Geometry-Aided Feedback and Transmission Design
Shima Eslami, Bikshapathi Gouda, Antti Tölli
Near-field (NF) line-of-sight (LoS) MIMO systems enable efficient channel state information (CSI) acquisition and precoding by exploiting known antenna geometries at both the base…
Data-Aided Regularization of Direct-Estimate Combiner in Distributed MIMO Systems
Bikshapathi Gouda, Italo Atzeni, Antti Tölli
This paper explores the data-aided regularization of the direct-estimate combiner in the uplink of a distributed multiple-input multiple-output system. The network-wide combiner ca…
Uplink Transmit Power Optimization for Distributed Massive MIMO Systems with 1-Bit ADCs
Bikshapathi Gouda, Italo Atzeni, Antti Tölli
This paper addresses the problem of uplink transmit power optimization in distributed massive multiple-input multiple-output systems, where remote radio heads (RRHs) are equipped w…
Combined DL-UL Distributed Beamforming Design for Cell-Free Massive MIMO
Bikshapathi Gouda, Antti Arvola, Italo Atzeni +1
We consider a cell-free massive multiple-input multiple-output system with multi-antenna access points (APs) and user equipments (UEs), where the UEs can be served in both the down…
Pilot-Based Uplink Power Control in Single-UE Massive MIMO Systems With 1-Bit ADCs
Amila Ravinath, Bikshapathi Gouda, Italo Atzeni +1
We propose uplink power control (PC) methods for massive multiple-input multiple-output systems with 1-bit analog-to-digital converters, which are specifically tailored to address…
Uplink Power Control for Distributed Massive MIMO with 1-Bit ADCs
Bikshapathi Gouda, Italo Atzeni, Antti Tölli
We consider the problem of uplink power control for distributed massive multiple-input multiple-output systems where the base stations (BSs) are equipped with 1-bit analog-to-digit…
Distributed Precoding Design for Multi-Group Multicasting in Cell-Free Massive MIMO
Bikshapathi Gouda, Italo Atzeni, Antti Tölli
We consider multi-group multicast precoding designs for cell-free massive multiple-input multiple-output (MIMO) systems. To optimize the transmit and receive beamforming strategies…
Pilot-Aided Distributed Multi-Group Multicast Precoding Design for Cell-Free Massive MIMO
Bikshapathi Gouda, Italo Atzeni, Antti Tölli
We propose fully distributed multi-group multicast precoding designs for cell-free massive multiple-input multiple-output (MIMO) systems with modest training overhead. We target th…
DQN-based Beamforming for Uplink mmWave Cellular-Connected UAVs
Susarla Praneeth, Gouda Bikshapathi, Deng Yansha +3
Unmanned aerial vehicles (UAVs) are the emerging vital components of millimeter wave (mmWave) wireless systems. Accurate beam alignment is essential for efficient beam-based mmWave…
Joint Minimum DL-UL Rate Maximization for Cell-Free Massive MIMO
Bikshapathi Gouda, Italo Atzeni, Antti Tölli
In cell-free massive multiple-input multiple-output (MIMO) systems, the beamforming strategies at the base stations (BSs) and user equipments (UEs) can be computed building on bi-d…
Low-complexity Multicast Beamforming for Multi-stream Multi-group Communications
Hamidreza Bakhshzad Mahmoodi, Bikshapathi Gouda, MohammadJavad Salehi +1
In this paper, assuming multi-antenna transmitter and receivers, we consider multicast beamformer design for the weighted max-min-fairness (WMMF) problem in a multi-stream multi-gr…
Distributed Precoding Design via Over-the-Air Signaling for Cell-Free Massive MIMO
Italo Atzeni, Bikshapathi Gouda, Antti Tölli
Most works on cell-free massive multiple-input multiple-output (MIMO) consider non-cooperative precoding strategies at the base stations (BSs) to avoid extensive channel state info…