Results 51 to 60 of about 76,661 (236)

A Low-Complexity, Full-Rate, Full-Diversity 2 X 2 STBC with Golden Code's Coding Gain [PDF]

, 2008
This paper presents a low-ML-decoding-complexity, full-rate, full-diversity space-time block code (STBC) for a 2 transmit antenna, 2 receive antenna multiple-input multiple-output (MIMO) system, with coding gain equal to that of the best and well known ...
Rajan, B. Sundar, Srinath, K. Pavan
core   +1 more source

Exact and approximate log-likelihood ratio of M-ary QAM with two-time dimensions

ICT Express, 2019
A (3×2m)-ary QAM scheme maps a binary symbol into two-consecutive signal points (signal vector). It provides very lower PAPR than the conventional QAM because it removes corner signal points.
Ji-hoon Lee, Hae Chung
doaj   +1 more source

SCMA Codebook Design

, 2014
Multicarrier CDMA is a multiple access scheme in which modulated QAM symbols are spread over OFDMA tones by using a generally complex spreading sequence. Effectively, a QAM symbol is repeated over multiple tones.
Baligh, Hadi, Bayesteh, Alireza, Nikopour, Hosein, Taherzadeh, Mahmoud   +3 more
core   +1 more source

The Dependence of Galaxy Shape on Luminosity and Surface Brightness Profile [PDF]

, 2005
For a sample of 96,951 galaxies from the Sloan Digital Sky Survey Data Release 3, we study the distribution of apparent axis ratios as a function of r-band absolute magnitude and surface brightness profile type.
Abramson I. S., Barbara S. Ryden, Benacchio L., Binney J., de Vaucouleurs G., Fasano G., Garijo A., Gerhard O. E., Huizinga J. E., Lambas D. G., R. Anthony Vincent, Vio R.   +11 more
core   +3 more sources

Topological Photonic Devices and Circuits at Terahertz Frequencies

Laser &Photonics Reviews, EarlyView.
This review examines how 3D topological insulators and emerging topological photonic phases enable robust, low‐loss and defect‐immune terahertz devices. Fundamental properties, device implementations and topological transport mechanisms are surveyed, revealing new opportunities for reconfigurable, high‐performance THz components and scalable ...
Samane Kalhor, Srabani Kar, Ranjan Singh, Kaveh Delfanazari   +3 more
wiley   +1 more source

Defence traits vary across leaf ages in the thistles (Cardueae)

Functional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Plants produce a variety of structural and chemical defences to deter herbivores, which can covary across every scale of biological organization. Along these lines, it has been suggested that young leaves differ from old leaves in their defence strategies, but studies ...
Miranda A. Sinnott‐Armstrong, Jaein Choi, Nathanael I. Lichti, Bruce R. Cooper, Miranda C. Desmangles, Nicholas A. Steeves, Chingyan Huang, Albert M. Quigley, Yingying Xie, Daniel S. Park   +9 more
wiley   +1 more source

Adaptively Loaded IM/DD Offset-QAM OFDM Based on Set-Partitioned QAM Formats

Asia Communications and Photonics Conference, 2017
We propose an adaptive-loading algorithm for SP-QAM formats, and experimentally show that SP-offset-QAM outperforms conventional offset-QAM and conventional SP-QAM, in adaptive-loaded IM/DD OFDM systems, and achieves >40 Gbit/s at 50 km without any guard interval.
Zhao, Jian, Chan, Chun-Kit
openaire   +2 more sources

Unified bit-based probabilistic data association aided MIMO detection for high-order QAM constellations [PDF]

, 2011
A unified Bit-based Probabilistic Data Association (B-PDA) detection approach is proposed for Multiple-Input Multiple-Output (MIMO) systems employing high-order rectangular Quadrature Amplitude Modulation (QAM).
Hanzo, Lajos, Lv, Tiejun, Maunder, Robert G., Yang, Shaoshi   +3 more
core   +1 more source

Linguistic Evidence Suggests that Xiōng‐nú and Huns Spoke the Same Paleo‐Siberian Language

Transactions of the Philological Society, EarlyView.
Abstract The Xiōng‐nú were a tribal confederation who dominated Inner Asia from the third century BC to the second century AD. Xiōng‐nú descendants later constituted the ethnic core of the European Huns. It has been argued that the Xiōng‐nú spoke an Iranian, Turkic, Mongolic or Yeniseian language, but the linguistic affiliation of the Xiōng‐nú and the ...
Svenja Bonmann, Simon Fries
wiley   +1 more source

Enabling Technology in High-Baud-Rate Coherent Optical Communication Systems

IEEE Access, 2020
High-baud-rate coherent optical system is essential to support the ever-increasing demand for high-speed applications. Owing to the recent progress in advanced modulation formats, over 1 Tb/s single-carrier data transmission has been achieved in the ...
Si-Ao Li, Hao Huang, Zhongqi Pan, Runze Yin, Yingning Wang, Yuxi Fang, Yiwen Zhang, Changjing Bao, Yongxiong Ren, Zhaohui Li, Yang Yue   +10 more
doaj   +1 more source