800G/λ transponder based on joint subband processing and subcarrier multiplexing

2019 ◽  
Author(s):  
Tingting Zhang ◽  
C. Sanchez ◽  
S. Sygletos ◽  
A. Ellis
Keyword(s):  
Subcarrier Multiplexing ◽  
Subband Processing

Interaction of Speech Coders and Atypical Speech II

2002 ◽  
Vol 45 (4) ◽  
pp. 689-699 ◽  
Author(s):  
Donald G. Jamieson ◽  
Vijay Parsa ◽  
Moneca C. Price ◽  
James Till
Keyword(s):  
Communication Systems ◽  
Speech Rate ◽  
Voice Quality ◽  
Voice Disorders ◽  
Normal Hearing ◽  
Speech Quality ◽  
Degraded Speech ◽  
Before And After ◽  
Subband Processing

We investigated how standard speech coders, currently used in modern communication systems, affect the quality of the speech of persons who have common speech and voice disorders. Three standardized speech coders (GSM 6.10 RPELTP, FS1016 CELP, and FS1015 LPC) and two speech coders based on subband processing were evaluated for their performance. Coder effects were assessed by measuring the quality of speech samples both before and after processing by the speech coders. Speech quality was rated by 10 listeners with normal hearing on 28 different scales representing pitch and loudness changes, speech rate, laryngeal and resonatory dysfunction, and coder-induced distortions. Results showed that (a) nine scale items were consistently and reliably rated by the listeners; (b) all coders degraded speech quality on these nine scales, with the GSM and CELP coders providing the better quality speech; and (c) interactions between coders and individual voices did occur on several voice quality scales.

scholarly journals Optimum Bias Point in Broadband Subcarrier Multiplexing With Optical IQ Modulators

2015 ◽  
Vol 33 (1) ◽  
pp. 258-266 ◽  
Author(s):  
Fernando A. Gutierrez ◽  
Philip Perry ◽  
Frank Smyth ◽  
Andrew D. Ellis ◽  
Liam P. Barry
Keyword(s):  
Subcarrier Multiplexing ◽  
Bias Point

scholarly journals Improving speech intelligibility in active hearing protectors and communication headsets with subband processing

2013 ◽  
Author(s):  
Anthony J. Brammer ◽  
Gongqiang Yu ◽  
Eric R. Bernstein ◽  
Martin G. Cherniack ◽  
Donald R. Peterson
Keyword(s):  
Speech Intelligibility ◽  
Hearing Protectors ◽  
Subband Processing

scholarly journals Performance Analysis of Crosstalk Subcarrier Multiplexing and Wave Division Multiplexing in Optical Communication System

2021 ◽  
Author(s):  
Ebrahim E. Elsayed
Keyword(s):  
Wavelength Division Multiplexing ◽  
Optical Communication ◽  
Stimulated Raman Scattering ◽  
Optical Network ◽  
Digital Signal ◽  
Input Power ◽  
Single Fiber ◽  
Wavelength Division ◽  
Channel Bandwidth ◽  
Subcarrier Multiplexing

Abstract In traditional optical communication, duplexity is achieved by using two fibers, each having a transmitter and a receiver. Economically, bidirectional wavelength division multiplexing (WDM) transmission systems utilizing a single fiber will be more attractive not only reducing the use of the fiber by a factor of two, but also the number of components. Duplex transmissions over a single fiber can double the capacity of an installed unidirectional link. The idea of this paper is to study another approach using the subcarrier multiplexing (SCM)-based optical network and evaluate the physical transmission quality of analog and digital signal using SCM approach and the characteristic of fiber nonlinear crosstalk such as stimulated Raman scattering, Cross phase modulation and four-wave mixing in the SCM externally modulation optical link. A suitable bandwidth of 890 – 950 MHz is selected for subcarriers and channel bandwidth of 200 KHz and carrier. By measuring the optical bit interference (OBI) performance limitations of the subcarrier multiplexing WDM optical transmission system is investigated. The OBI for 10 channels for input power 1 dB is -40 dB whereas for 110 channels the OBI is -20 dB separation of 250 KHz are considered.

scholarly journals Analysis of hybrid subcarrier multiplexing of OCDMA based on single photodiode detection

2017 ◽  
Vol 162 ◽  
pp. 01028 ◽  
Author(s):  
N. A. A Ahmad ◽  
M. N Junita ◽  
S.A. Aljunid ◽  
C.B.M. Rashidi ◽  
R. Endut
Keyword(s):  
Subcarrier Multiplexing

scholarly journals A Flexible Subcarrier Multiplexing System With Analog Transport and Digital Processing for 5G (and Beyond) Fronthaul

2019 ◽  
Vol 37 (14) ◽  
pp. 3689-3700 ◽  
Author(s):  
Shabnam Noor ◽  
Philippos Assimakopoulos ◽  
Nathan J. Gomes
Keyword(s):  
Digital Processing ◽  
Subcarrier Multiplexing
Sign in / Sign up

Export Citation Format

Share Document