Results 151 to 160 of about 85,381 (188)

Complex Codebooks From Combinatorial Designs

IEEE Transactions on Information Theory, 2006
Codebooks (also called signal sets) meeting the Welch bounds are desirable in code-division multiple-access (CDMA) systems. In 2003, binary codebooks meeting Welch's bounds were constructed using difference sets by Ding, Golin, and Kloslashve. Recently, a generic construction of codebooks with cyclic difference sets meeting Welch's bound on the maximum
openaire   +2 more sources

Nested codebook design for MIMO precoders

2008 42nd Asilomar Conference on Signals, Systems and Computers, 2008
In multi-input, multi-output (MIMO) communication systems, significant throughput gains can be obtained by closed-loop operation, where two aspects of the transmission are adapted to channel conditions: the transmission rank (number of independent spatial layers); and the precoding matrix which maps the spatial layers to the transmit antennas.
Badri Varadarajan, Eko Onggosanusi, Anand Dabak, Runhua Chen   +3 more
openaire   +1 more source

Codebook Design for Noncoherent Communications Using Autoencoders

2021 IEEE Conference of Russian Young Researchers in Electrical and Electronic Engineering (ElConRus), 2021
The problem of joint optimization of coding and modulation for noncoherent communications is considered. To minimize block error rate, an autoencoder network is used. The network architecture is designed to mimic the end-to-end operation of a communication system with noncoherent correlation receiver. Signal codebooks with various spectral efficiencies
Alexander B. Sergienko, Polina V. Apalina   +1 more
openaire   +1 more source

A novel VQ codebook design technique

IEEE Transactions on Consumer Electronics, 1997
In this paper, we present an approach to increase the amount of VQ codebook patterns to improve image quality without a large overhead on the codebook memory and search time. Basically, our approach characterizes a pattern into a key value, which is used in the codebook search; "reflection operation" was performed on codewords using the key values, to ...
null Jui-Hua Li, null Nam Ling
openaire   +1 more source

Hierarchical codebook design for massive MIMO

2013 8th International Conference on Communications and Networking in China (CHINACOM), 2013
The massive Multiple-Input Multiple-Output (MIMO) is an emerging research field, since the more antennas the transmitters or receivers equipped with, the higher spectral efficiency and link reliability the system can provide. Due to the limited feedback channel, precoding and codebook design are important to exploit the performance of massive MIMO.
Xin Su, Shichao Yu, Jie Zeng, Yujun Kuang, Nayan Fang, Zejiao Li   +5 more
openaire   +1 more source

Joint Codebook Design for Multi-cell Noma

ICASSP 2019 - 2019 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2019
For spreading-based multiple access, whether orthogonal (OMA) or non-orthogonal (NOMA), the spreading sequences (signatures) are selected from a predefined codebook. When operating in a cellular system, intercell interference will be inherently present between close base stations that share the same resources.
Bashar Tahir, Stefan Schwarz, Markus Rupp   +2 more
openaire   +1 more source

Codebook Design for LTE-A Downlink System

2011 IEEE Vehicular Technology Conference (VTC Fall), 2011
Multiple-input multiple-output (MIMO) has been adopted by long term evolution (LTE) and its updated version LTE-Advanced (LTE-A) to increase the spectrum efficiency. However, the benefits of multi-user (MU) MIMO highly rely on the accurate channel knowledge at the transmitter. So proper codebook design is a key problem for LTE-A FDD downlink system. In
Lu Wu, Jinhui Chen, Hongwei Yang, Di Lu
openaire   +1 more source

Irregular SCMA Codebook Design

2021 IEEE 21st International Conference on Communication Technology (ICCT), 2021
Shuyan Ni, Tuofeng Lei, Naiping Cheng, Xin Song, Aidi Zhang, LingFeng Cheng   +5 more
openaire   +1 more source

A Codebook Design Scheme for MIMO System

2011 International Conference on Internet Technology and Applications, 2011
This paper proposed an adaptive codebook design method based on codebook rotation, without changing the existing base matrix of the codebook,and according to the statistics and estimation results of the BER and SINR, to generate a new set of rotation matrix codebook.
Liyong He, Hui Li, Donglai Hao
openaire   +1 more source

A perceptually-based heuristic codebook design algorithm

IEEE International Symposium on Circuits and Systems, 2003
Although the generalized Lloyd algorithm (GLA) minimizes the average squared error on the training set, the squared-error distortion measure cannot discriminate between edge and shade vectors. Moreover, the GLA is dependent on the initial codebook. These drawbacks can lead to a perceptually poorly performing codebook. A heuristic algorithm is presented
K. Dezhgosha, M.M. Jamali, S.C. Kwatra
openaire   +1 more source