22 citations · 49 across the 7 of their papers we have counts for
7 papers
Optimal Transmit Power and Channel-Information Bit Allocation With Zeroforcing Beamforming in MIMO-NOMA and MIMO-OMA Downlinks
Kritsada Mamat, Wiroonsak Santipach
In downlink, a base station (BS) with multiple transmit antennas applies zeroforcing beamforming to transmit to single-antenna mobile users in a cell. We propose the schemes that o…
Neural Network Based Optimization of Transmit Beamforming and RIS Coefficients Using Channel Covariances in MISO Downlink
Khin Thandar Kyaw, Wiroonsak Santipach, Kritsada Mamat +3
We propose an unsupervised beamforming neural network (BNN) and a supervised reconfigurable intelligent surface (RIS) convolutional neural network (CNN) to optimize transmit beamfo…
On Optimizing Feedback Interval for Temporally Correlated MIMO Channels With Transmit Beamforming And Finite-Rate Feedback
Kritsada Mamat, Wiroonsak Santipach
A receiver with perfect channel state information (CSI) in a point-to-point multiple-input multiple-output (MIMO) channel can compute the transmit beamforming vector that maximizes…
Outage Bound for Max-Based Downlink Scheduling With Imperfect CSIT and Delay Constraint
Wiroonsak Santipach, Kritsada Mamat, Chalie Charoenlarpnopparut
We consider downlink max-based scheduling in which the base station and each user are equipped with a single antenna. In each time slot, the base station obtains channel gains of a…
On Transmit Beamforming for MISO-OFDM Channels With Finite-Rate Feedback
Kritsada Mamat, Wiroonsak Santipach
With finite-rate feedback, we propose two feedback methods for transmit beamforming in a point-to-point MISO-OFDM channel. For the first method, a receiver with perfect channel inf…
Power and Bit Allocation for Wireless OFDM Channels with Finite-Rate Feedback and Subcarrier Clustering
Wiroonsak Santipach, Kritsada Mamat, Ake Tonsirisittikun +1
The study investigated the allocation of transmission power and bits for a point-to-point orthogonal frequency-division multiplexing channel assuming perfect channel information at…
Tree-Structured Random Vector Quantization for Limited-Feedback Wireless Channels
Wiroonsak Santipach, Kritsada Mamat
We consider the quantization of a transmit beamforming vector in multiantenna channels and of a signature vector in code division multiple access (CDMA) systems. Assuming perfect c…