165 citations · 267 across the 12 of their papers we have counts for
12 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…
Energy-Minimizing Bit Allocation For Powerline OFDM With Multiple Delay Constraints
Kaemmatat Jiravanstit, Wiroonsak Santipach
We propose a bit-allocation scheme for powerline orthogonal frequency-division multiplexing (OFDM) that minimizes total transmit energy subject to total-bit and delay constraints.…
Subcarrier-Chunk Assignment With Power Allocation and Multiple-Rate Constraints for Downlink OFDMA
Juthatip Wisanmongkol, Wiroonsak Santipach
We consider downlink OFDMA in which users are imposed with different proportional-rate constraints, and a base station would like to maximise user rate over subcarrier assignment (…
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…
Optimization of Training and Feedback Overhead for Beamforming over Block Fading Channels
Wiroonsak Santipach, Michael L. Honig
We examine the capacity of beamforming over a single-user, multi-antenna link taking into account the overhead due to channel estimation and limited feedback of channel state infor…
Signature Quantization in Fading CDMA With Limited Feedback
Wiroonsak Santipach
In this work, we analyze the performance of a signature quantization scheme for reverse-link Direct Sequence (DS)- Code Division Multiple Access (CDMA). Assuming perfect estimates…
Capacity of a Multiple-Antenna Fading Channel with a Quantized Precoding Matrix
Wiroonsak Santipach, Michael L. Honig
Given a multiple-input multiple-output (MIMO) channel, feedback from the receiver can be used to specify a transmit precoding matrix, which selectively activates the strongest chan…