Results 121 to 130 of about 3,552 (166)
Some of the next articles are maybe not open access.
Journal of Optical Communications, 2021
Abstract In the present work, orthogonal frequency division multiplexing (OFDM) is combined with wavelength division multiplexing-passive optical networks (WDMPONs) to obtain the combined benefits of both technologies for overall system improvement. performance of five OFDM signals using WDM is analyzed.
Gagandeep Kumar, Kulwinder Singh
openaire +1 more source
Abstract In the present work, orthogonal frequency division multiplexing (OFDM) is combined with wavelength division multiplexing-passive optical networks (WDMPONs) to obtain the combined benefits of both technologies for overall system improvement. performance of five OFDM signals using WDM is analyzed.
Gagandeep Kumar, Kulwinder Singh
openaire +1 more source
Hybrid orthogonal frequency division multiplexing (H-OFDM) for visible light communication
11th International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM 2015), 2015In this paper, we present a novel hybrid orthogonal frequency division multiplexing (H-OFDM) for visible light communication (VLC). H-OFDM uses a combination of DC-bias optical OFDM (DCO-OFDM) and asymmetrically clipped optical OFDM (ACO-OFDM) techniques.
null Zhang Jun, null Zhang Jian
openaire +1 more source
Analysis of the effects of phase-noise in orthogonal frequency division multiplex (OFDM) systems
Proceedings IEEE International Conference on Communications ICC '95, 2002In OFDM transmission schemes, phase-noise from oscillator instabilities in the receiver is a potentially serious problem, especially when bandwidth efficient, high order signal constellations are employed. The paper analyses the two effects of phase-noise: inter-carrier interference (ICI) and a phase error common to all OFDM sub-carriers.
Robertson, P., Kaiser, S.
openaire +3 more sources
Orthogonal Frequency Division Multiplex (OFDM)
2004Almost from the beginning of the electrical transmission of messages about 100 years ago, single-carrier methods have been used for transmitting information. The message to be transmitted is impressed on a sinusoidal carrier by applying analog amplitude, frequency or phase modulation techniques.
openaire +1 more source
Maximum bandwidth of orthogonal frequency division multiplex (OFDM) over multipath fading channel
2004 International Conference on Communications, Circuits and Systems (IEEE Cat. No.04EX914), 2004Orthogonal frequency division multiplex (OFDM) is known as an effective method for high-rate transmission over frequency selective fading channels. However, time variations of the channel within an OFDM symbol leads to a loss of orthogonality between subcarriers, resulting in interchannel interference (ICI).
null Zhou Kainan, null Chew Yong Huat
openaire +1 more source
2012 8th International Symposium on Communication Systems, Networks & Digital Signal Processing (CSNDSP), 2012
We propose to achieve scalable O-OFDM network planning with a genetic algorithm (GA) that operates in an adaptive way for high optimization efficiency. When the network topology and lightpath requests are given, the GA encodes the routing, spectrum and modulation assignments (RSMA) as genes and optimizes them iteratively.
null Wei Lu +3 more
openaire +1 more source
We propose to achieve scalable O-OFDM network planning with a genetic algorithm (GA) that operates in an adaptive way for high optimization efficiency. When the network topology and lightpath requests are given, the GA encodes the routing, spectrum and modulation assignments (RSMA) as genes and optimizes them iteratively.
null Wei Lu +3 more
openaire +1 more source
2015 International Seminar on Intelligent Technology and Its Applications (ISITIA), 2015
The main problem in high data rate transmision is frequency selective fading due to multipath propagation. This fading causes deep fade on signal spectrum at one particular frequency. To overcome this problem, many researchers proposed a multi-carrier technique, which divides wideband signal bandwidth into multiple narrowband signal before transmitted ...
Titiek Suryani +3 more
openaire +1 more source
The main problem in high data rate transmision is frequency selective fading due to multipath propagation. This fading causes deep fade on signal spectrum at one particular frequency. To overcome this problem, many researchers proposed a multi-carrier technique, which divides wideband signal bandwidth into multiple narrowband signal before transmitted ...
Titiek Suryani +3 more
openaire +1 more source
2020 IEEE Globecom Workshops (GC Wkshps, 2020
Optical wireless communication (OWC), with intensity modulation (IM), requires the modulated radio frequency (RF) signal to be real and non-negative. To satisfy the requirements, this paper proposes a novel mixed orthogonal frequency division multiplexing (X-OFDM) waveform. Hermitian symmetry (HS) of the sub-carriers in frequency domain, guarantees the
Xu Li +4 more
openaire +1 more source
Optical wireless communication (OWC), with intensity modulation (IM), requires the modulated radio frequency (RF) signal to be real and non-negative. To satisfy the requirements, this paper proposes a novel mixed orthogonal frequency division multiplexing (X-OFDM) waveform. Hermitian symmetry (HS) of the sub-carriers in frequency domain, guarantees the
Xu Li +4 more
openaire +1 more source
2016 10th IEEE International Conference on Anti-counterfeiting, Security, and Identification (ASID), 2016
The rapid development of wireless communication technologye provide users with more convenience but also accompanied serious interference problem in wireless communication. Resolution of interference problem become much important for communication process.
null Jun Huang +5 more
openaire +1 more source
The rapid development of wireless communication technologye provide users with more convenience but also accompanied serious interference problem in wireless communication. Resolution of interference problem become much important for communication process.
null Jun Huang +5 more
openaire +1 more source
2003 IEEE Wireless Communications and Networking, 2003. WCNC 2003., 2005
Future, high bit rate communication systems tolerate very little error in the modulation. This means that conventionally negligible error sources like the imbalance between the in-phase (I) and quadrature (Q) branches of the receiver can start limiting the performance of the system.
openaire +1 more source
Future, high bit rate communication systems tolerate very little error in the modulation. This means that conventionally negligible error sources like the imbalance between the in-phase (I) and quadrature (Q) branches of the receiver can start limiting the performance of the system.
openaire +1 more source