Results 31 to 40 of about 4,923,004 (280)
IEEE 802.11ax OFDMA Resource Allocation with Frequency-Selective Fading
Sensors, 2021 This paper studies the usage of orthogonal frequency division multiple access (OFDMA) for uplink transmissions in IEEE 802.11ax networks. OFDMA enables simultaneous multi-user transmissions in Wi-Fi, but its usage requires efficient resource allocation ...
Sergei Tutelian +3 more
doaj +1 more source
A multiuser, multicarrier link adaptation atrategy for fading channels with PER constraints [PDF]
, 2011 Link Adaptation can dynamically adjust a number of transmission parameters, most often modulation and coding, to reflect the characteristics of the wireless link to improve throughput and maintain link reliability.
M. Nicolaou +7 more
core +1 more source
Secured Communication over Frequency-Selective Fading Channels: A Practical Vandermonde Precoding
EURASIP Journal on Wireless Communications and Networking, 2009 We study the frequency-selective broadcast channel with confidential messages (BCC) where the transmitter sends a confidential message to receiver 1 and a common message to receivers 1 and 2.
Debbah Mérouane +2 more
doaj +2 more sources
Comparison of Achievable Rates of OFDM and Single Carrier Communication Systems
Tsinghua Science and Technology, 2012 This paper presents a theoretical comparison of a single carrier system and a multi-carrier system through an analysis of the achievable rate under frequency selective fading with channel state information at the receiver.
Jiaqi Zhang, Yukui Pei, Ning Ge
doaj +1 more source
WAVELET MODULATION PERFORMANCE IN FADING CHANNELS [PDF]
Journal of Electrical and Electronics Engineering, 2008 Wavelet modulation simultaneously sends dataat multiple rates through an unknown channel. Preuiousresearch has demonstrated that wauelet modulation biterror rate performance in the additive, white, Gaussiannoise channel is comparable to theoretical ...
C. Gordan, R. Reiz, L. Morgoş
doaj
Optimizing time and space MIMO antenna system for frequency selective fading channels [PDF]
, 2001 Smart or adaptive antennas promise to provide significant increases in system capacity and performance in wireless communication systems. In this paper, we investigate the use of adaptive antennas at the base and mobile stations, operating jointly, to ...
Letaief, KB +5 more
core +1 more source
EURASIP Journal on Advances in Signal Processing, 2002 Differential space-time modulation (DSTM) for multiple antenna communication systems has been recently proposed for frequency-nonselective fading channels. In broadband multirate systems, frequency-selective fading may occur.
Wang Genyuan, Song Aijun, Xia Xiang-Gen
doaj +1 more source
Bounds on the capacity of ofdm under spread frequency selective fading channels [PDF]
2008 IEEE 25th Convention of Electrical and Electronics Engineers in Israel, 2008 The analysis of the channel capacity in the absence of prior channel knowledge (noncoherent channel) has gained increasing interest in recent years, but it is still unknown for the general case. In this paper we derive bounds on the capacity of the noncoherent, underspread complex Gaussian, orthogonal frequency division multiplexing (OFDM), wide sense ...
Itsik Bergel, Sergio Benedetto
openaire +4 more sources
IEEE Access, 2016 In this paper, a novel joint continuous power and rate adaptation scheme is proposed fordoubly selective fading channels in orthogonal frequency division multiplexing (OFDM) systems, based on terminal velocity and perfect or imperfect channel state ...
Zhi-Cheng Dong +3 more
doaj +1 more source
Multi-User CFOs Estimation for SC-FDMA System Over Frequency Selective Fading Channels
IEEE Access, 2018 Frequency synchronization in single-carrier frequency division multiple access (SC-FDMA) uplink system is a challenging task due to the presence of different carrier frequency offsets (CFOs) for different users.
Sushant Kumar, Sudhan Majhi, Chau Yuen
doaj +1 more source