Results 291 to 300 of about 140,441 (346)

Multi rate orthogonal frequency division multiplexing

IEEE International Conference on Communications, 2005. ICC 2005. 2005, 2005
A novel multi rate orthogonal frequency division multiplexing (OFDM) system is proposed in this paper. It is expected to provide a flexible physical layer support to next generation wireless networks. It is mainly suited to inter carrier interference limited situations, when a large number of sub carriers are used within the available bandwidth ...
Muhammad Imadur Rahman, Frank H. P. Fitzek, Suvra Sekhar Das   +2 more
openaire   +4 more sources

Orthogonal Frequency Division Multiplexing (OFDM)

2008 China-Japan Joint Microwave Conference, 2008
In broadband wireless system, the signal energy is scattered and reflected from objects in the environment, components of the signal arriving at the receiver are spread out over a longer period of time than is desirable. The challenge is then to provide a high-performance reliable data link that can operate with the restricted receiver power levels ...
openaire   +2 more sources

Spectrally Efficient Frequency Division Multiplexing With Index-Modulated Non-Orthogonal Subcarriers

IEEE Wireless Communications Letters, 2019
In this letter, we propose a novel index-modulated non-orthogonal spectrally efficient frequency-division multiplexing (SEFDM) scheme, in order to attain a higher bandwidth efficiency than the conventional orthogonal frequency-division multiplexing (OFDM)
Miyu Nakao, S. Sugiura
semanticscholar   +1 more source

Full-Duplex Relay-Assisted Orthogonal Frequency-Division Multiplexing With Index Modulation

IEEE Systems Journal, 2019
In this paper, we propose a full-duplex relay-assisted orthogonal frequency-division multiplexing (OFDM) with index modulation system, in which a complete transmission from source to destination is forwarded by a full-duplex decode-and-forward relay.
Jinxian Zhao, Shuping Dang, Zhongli Wang
semanticscholar   +1 more source

Equalization of orthogonal frequency division multiplexing signals

1994 IEEE GLOBECOM. Communications: The Global Bridge, 2002
An equalizer is generally a transversal filter which can be used either at the passband or the baseband. Adaptive equalizers adapt filter coefficients to cancel the channel response. We study two different frequency domain adaptive equalizers for orthogonal frequency division multiplexing systems (OFDM).
J. Rinne, Markku Renfors
openaire   +2 more sources

Non-orthogonal frequency division multiplexing based on sparse representation

IET Communications, 2018
This study proposes a sparse non-orthogonal frequency division multiplexing (S-NOFDM) based on sparse representation to improve the spectral efficiency of orthogonal frequency division multiplexing (OFDM).
Xiaomei Fu, Li Chen, Jingyu Yang
semanticscholar   +1 more source

Improved orthogonal frequency division multiplexing with generalised index modulation

IET Communications, 2016
Recently, the generalisation of orthogonal frequency division multiplexing with index modulation (OFDM-IM) was proposed in the authors’ previous works.
Rui Fan, Y. Yu, Y. Guan
semanticscholar   +1 more source

Faster-than-Nyquist non-orthogonal frequency-division multiplexing based on fractional Hartley transform.

Optics Letters, 2016
In this Letter, we propose, to the best of our knowledge, the first faster-than-Nyquist non-orthogonal frequency-division multiplexing based on fractional Hartley transform (FrHT).
Ji Zhou, Yaojun Qiao, Zhanyu Yang, Erkun Sun   +3 more
semanticscholar   +1 more source

Optical-orthogonal frequency division multiplexing-review

2017 IEEE International Conference on Power, Control, Signals and Instrumentation Engineering (ICPCSI), 2017
We have witnessed a drastic increase in Orthogonal Frequency Division Multiplexing (OFDM) in optical community in recent years. OFDM is a type of signal modulation. OFDM divides high data rate modulating stream into many slow modulated narrowband subcarriers. Thus, it is less sensitive to frequency fading.
S. Swaminathan, N. R. Raajan
openaire   +2 more sources

Equalization for orthogonal frequency division multiplexing system

IEEE 43rd Vehicular Technology Conference, 2002
Multipath distortion in a digital mobile channel can be alleviated by using the orthogonal frequency division multiplexing system in which the discrete Fourier transform is used for multiplexing N subchannels. Albeit every subchannel is subject to a flat fading, the difference in fading level results in intersymbol interference.
G. Kawas Kaleh, Mohamed Siala
openaire   +2 more sources