Results 1 - 10 of 377

System-level performance evaluation of downlink non-orthogonal multiple access (NOMA),”

by Yuya Saito , Anass Benjebbour , Yoshihisa Kishiyama , Takehiro Nakamura - IEEE PIMRC , 2013
"... Abstract-As a promising downlink multiple access scheme for further LTE enhancement and future radio access (FRA), this paper investigates the system-level performance of non-orthogonal multiple access (NOMA) with a successive interference canceller (SIC) on the receiver side. The goal is to clarif ..."
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Abstract-As a promising downlink multiple access scheme for further LTE enhancement and future radio access (FRA), this paper investigates the system-level performance of non-orthogonal multiple access (NOMA) with a successive interference canceller (SIC) on the receiver side. The goal

Non-Orthogonal Multiple Access for Visible Light Communications

by Hanaa Marshoud, Student Member, Vasileios M. Kapinas, George K. Karagiannidis, Sami Muhaidat, Senior Member
"... Abstract — The main limitation of visible light communica-tion (VLC) is the narrow modulation bandwidth, which reduces the achievable data rates. In this letter, we apply the non-orthogonal multiple access (NOMA) scheme to enhance the achievable throughput in high-rate VLC downlink networks. We firs ..."
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Abstract — The main limitation of visible light communica-tion (VLC) is the narrow modulation bandwidth, which reduces the achievable data rates. In this letter, we apply the non-orthogonal multiple access (NOMA) scheme to enhance the achievable throughput in high-rate VLC downlink networks. We

EFFICIENT MULTI-USER MIMO DOWNLINK PRECODING SCHEMES

by Martin Haardt, Veljko Stankovic, Giovanni Del Galdo
"... Space division multiple access (SDMA) promises high gains in the system throughput of wireless multiple antenna systems. If SDMA is used on the downlink of a multi-user MIMO sys-tem, either long-term or short-term channel state information has to be available at the base station (BS) to faciliate th ..."
Abstract - Cited by 1 (0 self) - Add to MetaCart
Space division multiple access (SDMA) promises high gains in the system throughput of wireless multiple antenna systems. If SDMA is used on the downlink of a multi-user MIMO sys-tem, either long-term or short-term channel state information has to be available at the base station (BS) to faciliate

MULTI-USER MULTI-ANTENNA COOPERATIVE CELLULAR SYSTEMS

by Yi Zheng , 2013
"... To meet the very high data rate requirements for wireless Internet and multimedia services, co-operative systems with multiple antennas have been proposed for future generation wireless systems. In this thesis, we focus on multiple antennas at the source, relay and destination. We study both downlin ..."
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Finally, our investigation culminates with a study of an uplink cooperative system equipped with multi-antenna relays under a capacity maximization criterion. The specific scheme that users access the base station through a single multi-antenna relay are studied. Iterative capacity maximization algorithm

An Improved Overloading Scheme for Downlink CDMA

by Frederik Vanhaverbeke, Marc Moeneclaey - EURASIP JOURNAL ON APPLIED SIGNAL PROCESSING 2005:5, 604–610 , 2005
"... An improved overloading scheme is presented for single-user detection in the downlink of multiple-access systems based on OCDMA/OCDMA (O/O). By displacing in time the orthogonal signatures of the two user sets that make up the overloaded system, the cross-correlation between the users of the two set ..."
Abstract - Cited by 1 (0 self) - Add to MetaCart
An improved overloading scheme is presented for single-user detection in the downlink of multiple-access systems based on OCDMA/OCDMA (O/O). By displacing in time the orthogonal signatures of the two user sets that make up the overloaded system, the cross-correlation between the users of the two

A Throughput Balancing Problem between Uplink and Downlink in Multi-user MIMO-based WLAN Systems

by Hu Jin, Bang Chul Jung, Ho Young Hwang, Dan Keun Sung
"... Abstract — Collision mitigation is one of classical research issues for wireless local area networks (WLANs). Recently, multiple-input multiple-output (MIMO) transmission techniques have been widely deployed in wireless systems, while a multi-user MIMO-based collision mitigation scheme in uplink WLA ..."
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Abstract — Collision mitigation is one of classical research issues for wireless local area networks (WLANs). Recently, multiple-input multiple-output (MIMO) transmission techniques have been widely deployed in wireless systems, while a multi-user MIMO-based collision mitigation scheme in uplink

Power Adaptive Network Coding for a Non-Orthogonal Multiple-Access Relay Channel

by Sha Wei, Jun Li, Wen Chen, Senior Member, Hang Su, Zihuai Lin, Senior Member, Branka Vucetic
"... Abstract—In this paper we propose a novel power adaptive network coding (PANC) for a non-orthogonal multiple-access relay channel (MARC), where two sources transmit their in-formation simultaneously to the destination with the help of a relay. In contrast to the conventional XOR-based network coding ..."
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Abstract—In this paper we propose a novel power adaptive network coding (PANC) for a non-orthogonal multiple-access relay channel (MARC), where two sources transmit their in-formation simultaneously to the destination with the help of a relay. In contrast to the conventional XOR-based network

Extending order preserving encryption for multi-user systems

by Liangliang Xiao, I-ling Yen, Dung T. Huynh - IACR Cryptology ePrint Archive
"... Abstract. Several order preserving encryption (OPE) algorithms have been developed in the literature to support search on encrypted data. However, existing OPE schemes only consider a single encryption key, which is infeasible for a practical system with multiple users (implying that all users shoul ..."
Abstract - Cited by 6 (0 self) - Add to MetaCart
should have the single encryption key in order to encrypt or decrypt confidential data). In this paper, we develop the first protocols, DOPE and OE-DOPE, to support the use of OPE in multi-user systems. First, we introduce a group of key agents into the system and invent the DOPE protocol to enable

ON THE PERFORMANCE OF SDMA WITH SOFT DROPPING AND SINR BALANCING POWER CONTROL IN THE DOWNLINK OF MULTI-USER MIMO SYSTEMS

by Tarcisio F. Maciel, Anja Klein
"... The application of Space Division Multiple Access (SDMA) to the downlink of future Orthogonal Frequency Division Multiple Access (OFDMA) mobile radio systems is a promis-ing solution to achieve high spectral efficiency. Besides en-hancing system capacity, Quality of Service (QoS) require-ments must ..."
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The application of Space Division Multiple Access (SDMA) to the downlink of future Orthogonal Frequency Division Multiple Access (OFDMA) mobile radio systems is a promis-ing solution to achieve high spectral efficiency. Besides en-hancing system capacity, Quality of Service (QoS) require-ments must

All-Digital Impulse Radio For MUI/ISI-Resilient Multi-User Communications Over Frequency-Selective Multipath Channels

by Christophe J. Le Martret, Georgios B. Giannakis - in Milcom , 2000
"... Impulse radio (IR) is an ultra-wideband system with attractive features for baseband asynchronous multiple access (MA), multimedia services, and tactical wireless communications. Implemented with analog components, the continuoustime IRMA model utilizes pulse-position modulation (PPM) and random tim ..."
Abstract - Cited by 6 (0 self) - Add to MetaCart
time-hopping codes to alleviate multipath effects and suppress multiuser interference (MUI). We introduce a novel continuous-time Multiple Input Multiple Output (MIMO) PPMIRMA scheme, and derive its discrete-time equivalent model. Relying on a time-division-duplex access protocol and orthogonal user
Results 1 - 10 of 377