Results 61 to 70 of about 4,823 (179)
A Tutorial on Nonorthogonal Multiple Access for 5G and Beyond
Wireless Communications and Mobile Computing, Volume 2018, Issue 1, 2018., 2018 Today’s wireless networks allocate radio resources to users based on the orthogonal multiple access (OMA) principle. However, as the number of users increases, OMA based approaches may not meet the stringent emerging requirements including very high spectral efficiency, very low latency, and massive device connectivity.
Mahmoud Aldababsa +5 more
wiley +1 more source
Sensitivity of Multicarrier Two-Dimensional Spreading Schemes to Synchronization Errors
EURASIP Journal on Wireless Communications and Networking, 2008 This paper presents the impact of synchronization errors on the performance of a downlink multicarrier two-dimensional spreading OFDM-CDMA system. This impact is measured by the degradation of the signal to interference and noise ratio (SINR) obtained ...
Ros Laurent +3 more
doaj +2 more sources
Subcarrier and Power Allocation for LDS-OFDM System [PDF]
, 2011 Low Density Signature-Orthogonal Frequency Division Multiplexing (LDS-OFDM) has been introduced recently as an efficient multiple access technique. In this paper, we focus on the subcarrier and power allocation scheme for uplink LDS-OFDM system.
AL-Imari, Mohammed +3 more
core +1 more source
DOA Estimation in the Uplink of Multicarrier CDMA Systems
EURASIP Journal on Wireless Communications and Networking, 2007 We consider the uplink of a multicarrier code-division multiple-access (MC-CDMA) network and assume that the base station is endowed with a uniform linear array. Transmission takes place over a multipath channel and the goal is the estimation of the directions of arrival (DOAs) of the signal from the active users.
D'AMICO, ANTONIO ALBERTO +2 more
openaire +4 more sources
Modified Three‐Dimensional Multicarrier Optical Prime Codes
International Journal of Optics, Volume 2016, Issue 1, 2016., 2016 We propose a mathematical model for novel three‐dimensional multicarrier optical codes in terms of wavelength/time/space based on the prime sequence algorithm. The proposed model has been extensively simulated on MATLAB for prime numbers (P) to analyze the performance of code in terms of autocorrelation and cross‐correlation.
Rajesh Yadav +2 more
wiley +1 more source
Spectral Efficiency Comparison of OFDM and MC-CDMA with Carrier Frequency Offset [PDF]
Radioengineering, 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
Multi-code Multicarrier CDMA: Performance Analysis
Journal of Communications Software and Systems, 2006 A new multi-code multicarrier code division multiple access (MC-MC-CDMA) system is proposed and analyzed in afrequency selective fading channel. By allowing each user to transmit an M-ary code sequence, the proposed MC-MC-CDMA system can support various ...
Taeyoon Kim +3 more
doaj
Blind Joint Soft-Detection Assisted Slow Frequency-Hopping Multicarrier DS-CDMA [PDF]
, 2000 A novel multiple-access scheme based on slow frequency-hopping multicarrier direct-sequence, code-division multiple access (SFH/MC DS-CDMA) is proposed and investigated, which can be rendered compatible with the existing second-generation narrow-band ...
Hanzo, L., Yang, L-L.
core +1 more source
EXIT-charts-aided hybrid multiuser detector for multicarrier interleave-division multiple access [PDF]
, 2010 A generically applicable hybrid multiuser detector (MUD) concept is proposed by appropriately activating different MUDs in consecutive turbo iterations based on the mutual information (MI) gain.
Chen, Sheng +3 more
core +2 more sources
EURASIP Journal on Advances in Signal Processing, 2005 The performance of multicarrier systems is highly impaired by intercarrier interference (ICI) due to frequency synchronization errors at the receiver and by intermodulation distortion (IMD) introduced by a nonlinear amplifier (NLA) at the transmitter ...
Rugini Luca, Banelli Paolo
doaj +1 more source