Results 21 to 30 of about 3,263 (149)
Accurate BER of MC-DS-CDMA over Rayleigh fading channels [PDF]
, 2007 In this paper, we derive an accurate average bit error rate (BER) of Rayleigh faded MC-DS-CDMA in the context of asynchronous transmission and random spreading sequences. The analysis is based on the characteristic function, and does not resort to any assumption on the statistical behavior of the interference.
Besma Smida, Lajos Hanzo, Sofiène Affes
openaire +1 more source
Spectral efficiency of a cellular MC/DS‐CDMA system in Rayleigh fading
International Journal of Communication Systems, 2005 AbstractThe spectral efficiency of a multicarrier direct‐sequence code‐division multiple‐access (MC/DS‐CDMA) cellular system, operating in a mobile radio environment with Rayleigh fading, is investigated and evaluated in terms of channel capacity (in the Shannon sense) per user, estimated in an average sense. The analysis is based on the combination of
Panagiotis Varzakas, George S. Tombras
openaire +4 more sources
, 2005 In this contribution a generalized MC DS-CDMA system invoking smart antennas for improving the achievable performance in the downlink of the system is studied, which is capable of minimizing the downlink interference inflicted upon co-channel mobiles ...
Hanzo, L., Hu, B., Yang, L-L.
core +1 more source
Statistical Modeling of Bit-Error-Rates in Asynchronous Multicarrier CDMA and Direct-Sequence CDMA Systems [PDF]
, 2004 This paper presents a method for modeling the bit-error-rate (BER) probability density functions (pdf) of asynchronous Multicarrier Code Division Multiple Access (MC-CDMA) and Direct-Sequence Code Division Multiple Access (DS-CDMA) systems.
Carey, Daniel +2 more
core +2 more sources
The Journal of Engineering, Volume 2019, Issue 21, Page 7966-7972, November 2019., 2019 Integration of radar and communication (Radcom) is one of the important research areas for multi‐functional integrated radio frequency systems. Most attention has been drawn to the Radcom system based on signal‐sharing, due to its high integration degree.
Xiao‐Bai Li +3 more
wiley +1 more source
Bioelectromagnetics, Volume 40, Issue 7, Page 498-511, October 2019., 2019 Despite much research, gaps remain in knowledge about the potential health effects of exposure to radiofrequency (RF) fields. This study investigated the effects of early‐life exposure to pulsed long term evolution (LTE) 1,846 MHz downlink signals on innate mouse behavior.
Kerry A. Broom +4 more
wiley +1 more source
Complexity, Volume 2019, Issue 1, 2019., 2019 By introducing a flux‐controlled memristor with quadratic nonlinearity into a 4D hyperchaotic system as a feedback term, a novel 5D hyperchaotic four‐wing memristive system (HFWMS) is derived in this paper. The HFWMS with multiline equilibrium and three positive Lyapunov exponents presented very complex dynamic characteristics, such as the existence of
Fei Yu +9 more
wiley +1 more source
Downlink Steered Space-Time Spreading Assisted Generalised Multicarrier DS-CDMA Using Sphere-Packing-Aided Multilevel Coding [PDF]
, 2007 This paper presents a novel generalised Multi-Carrier Direct Sequence Code Division Multiple Access (MC DS-CDMA) system invoking smart antennas for improving the achievable performance in the downlink, as well as employing multi-dimensional Sphere ...
El-Hajjar, M +4 more
core +1 more source
A Multiple‐Access Time and Frequency Spectrum‐Spreading Modulation
Wireless Communications and Mobile Computing, Volume 2018, Issue 1, 2018., 2018 In this paper a novel modulation scheme called Carrier Interleaved Multiple Access (CIMA) is proposed. CIMA provides an alternative for multiple‐access modulation accommodating resistance to noise and channel interference. The approach is based on polar signaling modulated with an FM‐like composite sinusoidal function.
Samer S. Saab +3 more
wiley +1 more source
Energy‐Aware Protocol Design and Evaluation of the PHY Layer in Satellite IoT
International Journal of Satellite Communications and Networking, Volume 43, Issue 2, Page 61-76, March/April 2025.ABSTRACT Direct‐to‐satellite communication for the Internet of Things (IoT) has attracted significant interest from both the scientific community and major telecommunications players. The integration of satellite connectivity in smartphones and IoT devices promises a transformative impact on critical applications such as environmental monitoring, asset
Simon Heine +2 more
wiley +1 more source