Results 101 to 110 of about 145,584 (294)

Joint quadrature modulation and network coding for cooperative Hybrid-ARQ

Tongxin xuebao, 2013
In order to improve the transmission efficiency of quadrature modulated cooperative diversity system,the joint network coding and quadrature modulated scheme for coo ve hybrid automatic repeat request (NC-QM-HARQ)was proposed.By introducing network ...
Xiao-ye SHI, Jian-hua GE, Jing LI, De-feng REN   +3 more
doaj   +2 more sources

In-Band Estimation of Optical Signal-to-Noise Ratio From Equalized Signals in Digital Coherent Receivers

IEEE Photonics Journal, 2014
We propose a novel method of in-band estimation of optical signal-to-noise ratio (OSNR) using a digital coherent receiver, where OSNR is determined from second- and fourth-order statistical moments of equalized signals in any modulation format.
Md. Saifuddin Faruk, Yojiro Mori, Kazuro Kikuchi   +2 more
doaj   +1 more source

Simplification of the Gram Matrix Eigenvalue Problem for Quadrature Amplitude Modulation Signals. [PDF]

Entropy (Basel), 2022
Miyazaki R, Wang T, Usuda TS.
europepmc   +1 more source

Ternary Trellis Coded Modulation

IEEE Access, 2019
Ternary trellis coded modulation (TTCM) is introduced. This combines triangular signal constellations with ternary convolutional codes. The performance of TTCM is presented and compared with binary trellis coded modulation (BTCM) which employs square ...
Mahmoud Abdelaziz, T. Aaron Gulliver
doaj   +1 more source

Signal Constellation Design for Cross-Phase Modulation Dominated Channels

IEEE Photonics Journal, 2015
In this paper, we introduce an optimal signal constellation design algorithm suitable for wavelength-division-multiplexed systems dominated by cross-phase modulation (XPM), which is called XPM-OSCD.
Tao Liu, Ivan B. Djordjevic
doaj   +1 more source

BER Performance of QAM and QPSK Modulation Technique for DCT Based Channel Estimation of STBC MIMO OFDM

MATEC Web of Conferences, 2016
Consumer demand for high speed data communication system is increasing day by day. However the major challenges for wireless communication system are Inter Symbol Interference (ISI) and Inter Carrier Interference (ICI) that occur during data transmission.
Sarnin Suzi Seroja, Sulong Siti Maisurah, Abu Hasan Asa’Ari Nurhuda   +2 more
doaj   +1 more source

Advantages of the coherent state compared with squeeze state in unidimensional continuous variable quantum key distribution

, 2018
In this work, a comparison study between unidimensional (UD) coherent-state and UD squeeze-state protocols is performed in the continuous variable quantum key distribution domain.
Cao, Yanxia, Li, Yongmin, Wang, Pu, Wang, Xuyang   +3 more
core   +1 more source

Self-referenced continuous-variable quantum key distribution protocol

, 2015
We introduce a new continuous-variable quantum key distribution (CV-QKD) protocol, self-referenced CV-QKD, that eliminates the need for transmission of a high-power local oscillator between the communicating parties.
Brif, Constantin, Camacho, Ryan M., Coles, Patrick J., Lütkenhaus, Norbert, Sarovar, Mohan, Soh, Daniel B. S., Urayama, Junji   +6 more
core   +2 more sources

Optimizing the Shape of Signals with Quadrature Amplitude Modulation According to the Criterion of Given Reduction Rate of Out-of-Band Emissions

, 2022
Sergey B. Makarov, Sergey V. Zavjalov, Anna S. Ovsyannikova   +2 more
openalex   +2 more sources

Analyses of wavelength- and polarization-division multiplexed transmission characteristics of optical quadrature-amplitude-modulation signals.

Optics Express, 2011
We theoretically study optical transmission characteristics of wavelength-division multiplexed (WDM) and polarization-multiplexed (POLMUX) signals using high-order optical quadrature-amplitude-modulation (QAM) formats up to 256.
K. Kikuchi
semanticscholar   +1 more source