Results 11 to 20 of about 22,554 (188)
Advanced Receiver Design for Quadrature OFDMA Systems
EURASIP Journal on Wireless Communications and Networking, 2009 Quadrature orthogonal frequency division multiple access (Q-OFDMA) systems have been recently proposed to reduce the peak-to-average power ratio (PAPR) and complexity, and improve carrier frequency offset (CFO) robustness and frequency diversity for the ...
Lin Luo +2 more
doaj +2 more sources
Optimal Scheduling for OFDMA Systems [PDF]
2006 Fortieth Asilomar Conference on Signals, Systems and Computers, 2006 We consider a scheduling and resource allocation problem for the downlink of an OFDMA-based wireless network, where the channel estimation error is modeled by a self-noise term in the decoding process. During each time-slot this involves selecting a subset of users for transmission, determining the assignment of available subcarriers to selected users,
Agrawal, Rajeev +3 more
openaire +2 more sources
Novel Predistortion Algorithm for OFDMA [PDF]
VTC Spring 2009 - IEEE 69th Vehicular Technology Conference, 2009 RF amplifier in a wireless communication system is usually non-linear in nature. If such an amplifier is used in OFDMA based systems, it will cause serious degradation. This degradation will be both in terms of the reduction in BER and the generation of out of band noise. In this paper we have worked on the linearization method of the amplifier.
Ali, Saqib +2 more
openaire +2 more sources
Slow Adaptive OFDMA Systems Through Chance Constrained Programming [PDF]
, 2009 Adaptive OFDMA has recently been recognized as a promising technique for providing high spectral efficiency in future broadband wireless systems. The research over the last decade on adaptive OFDMA systems has focused on adapting the allocation of radio ...
Jun, Ying +4 more
core +2 more sources
Performance analysis of layered random beamforming OFMDA with feedback reduction [PDF]
, 2007 This paper presents a downlink performance analysis of a Layered Random Beamforming (LRB) - MIMO-OFDMA Physical Layer (PHY) with feedback reduction as applicable to future generation wireless communication systems.
Armour, SMD +4 more
core +3 more sources
Multi-group frequency hopping OFDMA based on statistical multiplexing [PDF]
, 2008 In this paper, the multi-group frequency hopping OFDMA (MG-FH OFDMA) based on the statistical multiplexing is proposed for the downlink cellular system. Compared with the existed random frequency hopping OFDMA (RFH-OFDMA) system utilizing the statistical
Gong, Ping +4 more
core +1 more source
OFDMA Based QoS-Oriented Guarantee Novelty Multiple Access Protocol [PDF]
Xibei Gongye Daxue Xuebao, 2018 The next generation wireless local area network (WLAN) 802.11ax standards committee takes high quality of service(QoS) guarantee as one of important technology goals of the next generation WLAN.
doaj +1 more source
Performance Evaluation of Low Density Spreading Multiple Access [PDF]
, 2012 In this paper, we evaluate the performance of Multicarrier-Low Density Spreading Multiple Access (MC-LDSMA) as a multiple access technique for mobile communication systems. The MC-LDSMA technique is compared with current multiple access techniques, OFDMA
AL-Imari, Mohammed +3 more
core +1 more source
Optimal Subcarrier Allocation Algorithm for OFDMA Systems [PDF]
Engineering and Technology Journal, 2013 An optimal subcarrier allocation algorithm is proposed for orthogonal frequency division multiple access systems over Rayleigh fading channels with channel state information feedback. The transmitted orthogonal frequency division multiple access frame is
Sahar Salman Mahmood
doaj +1 more source
Performance evaluation of hybrid ARQ schemes of 3GPP LTE OFDMA system [PDF]
, 2007 Expectations and requirements for future wireless communication systems continue to grow and evolve. Thus, recently, the Third Generation Partnership Project (3GPP) has considered the Long Term Evolution (LTE) of 3G - also known as Super 3G - to ensure ...
Armour, SMD, Beh, KC, Doufexi, A
core +2 more sources