Results 261 to 270 of about 51,455 (301)
Some of the next articles are maybe not open access.
Orthogonal Frequency Division Multiplexing With Subcarrier Gap Modulation
2020 IEEE 31st Annual International Symposium on Personal, Indoor and Mobile Radio Communications, 2020A new modulation scheme called orthogonal frequency division multiplexing with subcarrier gap modulation (OFDM-SGM) is proposed. The proposed scheme embeds extra information bits by exploiting the gap between the active subcarriers in each subblock.
Jaradat, Ahmad Mohammad +2 more
openaire +3 more sources
Constant modulus orthogonal frequency division multiplexing
2010 - MILCOM 2010 MILITARY COMMUNICATIONS CONFERENCE, 2010Orthogonal frequency domain multiplexing (OFDM) is the signal format of choice for spectrally efficient communications over time-invariant, frequency-selective channels. OFDM has a large peak-to-average power ratio, however, which makes it incompatible with transmitter non-linearities {e.g., saturated power amplifiers (PAs)). Conversely, single-carrier
Cenk Kose +2 more
openaire +1 more source
Coded orthogonal frequency division multiplex [TV broadcasting]
Proceedings of the IEEE, 1995Technological evolution and the ever-increasing demand for higher-quality services give broadcasters a strong incentive to completely digitize their broadcasting networks. This digitization, which is already well advanced in many program production areas and transmission links, now has to be extended to complete the last link in the broadcast chain; i ...
B. Le Floch, M. Alard, C. Berrou
openaire +1 more source
Equalization of orthogonal frequency division multiplexing signals
1994 IEEE GLOBECOM. Communications: The Global Bridge, 2002An 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, M. Renfors
openaire +1 more source
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
Constant-envelope orthogonal frequency division multiplexing modulation
Fifth Asia-Pacific Conference on ... and Fourth Optoelectronics and Communications Conference on Communications,, 1999A constant-envelope signaling approach for orthogonal frequency division multiplexing (OFDM) modulation is proposed. By splitting the standard OFDM complex signals into real and imaginary sections, the proposed approach employs phase modulation in conjunction with signal clipping to endow the transmitted signal with a constant envelope, without ...
null Char-Dir Chung, null Shih-Ming Cho
openaire +1 more source
Interleaved Orthogonal Frequency Division Multiplexing (IOFDM) System
IEEE Transactions on Signal Processing, 2004In orthogonal frequency division multiplexing (OFDM) systems, for every block of K data samples, an overhead of L samples of cyclic prefix (CP) or zero padding (ZP) is added to combat frequency selective channels. The code rate, which is defined as the ratio K/(K+L), is a measure of the efficiency of transmitting user information.
Prasad, VGS, Hari, KVS
openaire +1 more source
Coded Orthogonal Frequency Division Multiplex (COFDM)
2010Almost 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
Orthogonal Frequency Division Multiplexing for IoT
2021Arvind Kumar, Rajoo Pandey
openaire +1 more source