Results 21 to 30 of about 23,563 (255)

Frequency-Domain Oversampling for Cognitive CDMA Systems: Enabling Robust and Massive Multiple Access for Internet of Things

open access: yesIEEE Access, 2016
Toward the era of mobile internet and Internet of Things (IoT), numerous sensors and devices are being introduced and interconnected. To support such amount of data traffic, traditional wireless communication technologies are facing challenges both in ...
Su Hu   +5 more
doaj   +1 more source

A Framework for Code Division Multiple Access Wireless Power Transfer

open access: yesIEEE Access, 2021
The availability of energy is one of the major hindrances to unlocking the massive potential of electronic devices. Powering a highly connected network of devices requires multiple access and a wireless power transfer (WPT) solution that is scalable and ...
Akshay Sarin, Al-Thaddeus Avestruz
doaj   +1 more source

Spectral Efficiency Comparison of OFDM and MC-CDMA with Carrier Frequency Offset [PDF]

open access: yesRadioengineering, 2017
Inter-carrier interference and multiple access interference due to carrier frequency offset (CFO) are two major factors that deteriorate the performance of orthogonal frequency division multiple access (OFDMA) and multicarrier code division multiple ...
J. Ahmed
doaj  

Analysis of Serial Search Based Code Acquisition in the Multiple Transmit/Multiple Receive Antenna Aided DS-CDMA Downlink, [PDF]

open access: yes, 2008
—In this paper, we investigate the serial-search-based initial code-acquisition performance of direct-sequence code division multiple access (DS-CDMA) employing multiple transmit/multiple receive antennas when communicating over uncorrelated Rayleigh ...
Hanzo, Lajos, Won, Seung
core   +1 more source

A Complementary Code-CDMA-Based MAC Protocol for UWB WPAN System

open access: yesEURASIP Journal on Wireless Communications and Networking, 2005
We propose a new multiple access control (MAC) protocol based on complementary code-code division multiple access (CC-CDMA) technology to resolve collisions among access-request packets in an ultra-wideband wireless personal area network (UWB WPAN ...
Zhu Jiang, Fapojuwo Abraham O.
doaj   +2 more sources

CDMA/OTFS Sensing Outperforms Pure OTFS at the Same Communication Throughput

open access: yesIEEE Open Journal of Vehicular Technology
There is a dearth of publications on the subject of spreading-aided Orthogonal Time Frequency Space (OTFS) solutions, especially for Integrated Sensing and Communication (ISAC), even though Code Division Multiple Access (CDMA) assisted multi-user OTFS ...
Hugo Hawkins   +3 more
doaj   +1 more source

A new spreading scheme for convolutionally coded CDMA communication in a Rayleigh-fading channel [PDF]

open access: yes, 1996
There has been increased interest in the use of direct-sequence code-division multiple-access (DS/CDMA) for wireless communication systems. We find that the asymptotic bit-error probability (BEP), P_b, of a convolutionally coded code-division multiple ...
Bang, Young Jo, Kim, Sang Wu
core   +1 more source

Multiuser cyclic shift keying spread spectrum underwater acoustic communication

open access: yesTongxin xuebao, 2017
Aiming at the problem of low data rate and high receiver complexity of existing direct sequence spread spectrum code division multiple access (DS-CDMA),a novel code division multiple access (CDMA) using cyclic shift keying (CSK) signaling,namely CSK-CDMA,
Cheng-bing HE   +6 more
doaj   +2 more sources

Precise BER Formulas for Asynchronous QPSK-Modulated DS-CDMA Systems Using Random Quaternary Spreading Over Rayleigh Channels

open access: yes, 2008
Precise bit-error-ratio (BER) analysis of an asynchronous QPSK-modulated direct-sequence code-division multiple-access system using random quaternary spreading sequences for transmission over Rayleigh channels is performed based on the characteristic ...
Hanzo, L, Liu, X
core   +1 more source

Information theoretic analysis of LSD scheme [PDF]

open access: yes, 2011
In this paper, the capacity region of Low Density Signature Multiple Access Channel (LDS-MAC) is calculated through information theoretic analysis. LDS Code Division Multiple Access (LDS-CDMA) uses spreading sequences of low density for spreading the ...
Hoshyar, R.   +3 more
core   +1 more source

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