Results 21 to 30 of about 142,675 (313)

A Novel Multitask Learning Empowered Codebook Design for Downlink SCMA Networks [PDF]

IEEE Wireless Communications Letters, 2022
Sparse code multiple access (SCMA) is a promising code-domain non-orthogonal multiple access (NOMA) scheme for the enabling of massive machine-type communication.
Qu Luo, Zilong Liu, Gaojie Chen, Y. Ma, Pei Xiao   +4 more
semanticscholar   +1 more source

A Partial Channel Reciprocity-Based Codebook for Wideband FDD Massive MIMO [PDF]

IEEE Transactions on Wireless Communications, 2022
The acquisition of channel state information (CSI) in Frequency Division Duplex (FDD) massive MIMO has been a formidable challenge. In this paper, we address this problem with a novel CSI feedback framework enabled by the partial reciprocity of uplink ...
Haifan Yin, D. Gesbert
semanticscholar   +1 more source

Robust MMSE Precoding Strategy for Multiuser MIMO Relay Systems with Switched Relaying and Side Information [PDF]

, 2013
In this work, we propose a minimum mean squared error (MMSE) robust base station (BS) precoding strategy based on switched relaying (SR) processing and limited transmission of side information for interference suppression in the downlink of multiuser ...
Cai, Yunlong, Lamare, Rodrigo C. de, Yang, Lie-Liang, Zhao, Minjian   +3 more
core   +1 more source

Improvements on stochastic vector quantization of images [PDF]

, 1993
A novel nonadaptive fixed-rate vector quantizer encoding scheme is presented, and preliminary results are shown. The design of the codebook has been based on a stochastic approach in order to match a previously defined model for the image to be encoded ...
Torres Urgell, Lluís
core   +1 more source

Optimization-Based Phase-Shift Codebook Design for Large IRSs [PDF]

IEEE Communications Letters, 2022
In this letter, we focus on large intelligent reflecting surfaces (IRSs) and propose a new codebook construction method to obtain a set of pre-designed phase-shift configurations for the IRS unit cells. Since the complexity of online optimization and the
Walid R. Ghanem, V. Jamali, M. Schellmann, Hanwen Cao, J. Eichinger, R. Schober   +5 more
semanticscholar   +1 more source

Codebook

A codebook of qualitative codes, their definitions, and associated categories.
  +7 more sources

Environment-Aware Codebook Design for RIS-Assisted MU-MISO Communications: Implementation and Performance Analysis [PDF]

IEEE Transactions on Communications
Reconfigurable intelligent surface (RIS) provides a new electromagnetic response control solution, which can proactively reshape the characteristics of wireless channel environments. In RIS-assisted communication systems, the acquisition of channel state
Zhiheng Yu, Jiancheng An, E. Başar, Lu Gan, Chau Yuen   +4 more
semanticscholar   +1 more source

An Efficient Codebook Initialization Approach for LBG Algorithm

, 2011
In VQ based image compression technique has three major steps namely (i) Codebook Design, (ii) VQ Encoding Process and (iii) VQ Decoding Process. The performance of VQ based image compression technique depends upon the constructed codebook. A widely used
Pal, Arup Kumar, Sar, Anup
core   +1 more source

Constructive spherical codes on layers of flat tori [PDF]

, 2012
A new class of spherical codes is constructed by selecting a finite subset of flat tori from a foliation of the unit sphere S^{2L-1} of R^{2L} and designing a structured codebook on each torus layer.
Costa, Sueli I. R., Torezzan, Cristiano, Vaishampayan, Vinay A.   +2 more
core   +1 more source

Attempting rigour and replicability in thematic analysis of qualitative research data; a case study of codebook development

BMC Medical Research Methodology, 2019
BackgroundNavigating the world of qualitative thematic analysis can be challenging. This is compounded by the fact that detailed descriptions of methods are often omitted from qualitative discussions.
K. Roberts, A. Dowell, J. Nie
semanticscholar   +1 more source