Results 51 to 60 of about 2,093,139 (198)

Simulation Analysis of Medium Access Techniques

, 2012
This paper presents comparison of Access Techniques used in Medium Access Control (MAC) protocol for Wireless Body Area Networks (WBANs). Comparison is performed between Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA ...
Israr, I., Javaid, N., Khan, Z. A., Qasim, U., Yaqoob, M. M.   +4 more
core   +1 more source

Time-Reversal Division Multiple Access over Multi-Path Channels [PDF]

IEEE Transactions on Communications, 2012
The multi-path effect makes high speed broadband communications a very challenging task due to the severe inter-symbol interference (ISI). By concentrating energy in both the spatial and temporal domains, time-reversal (TR) transmission technique provides a great potential of low-complexity energy-efficient communications.
Feng Han, Yu-Han Yang, Beibei Wang, Yongle Wu, K. J. Ray Liu   +4 more
openaire   +1 more source

Multiuser Detection Assisted Time- and Frequency-Domain Spread Multicarrier Code-Division Multiple-Access

, 2006
In this contribution, we study a reduced-complexity multiuser detection aided multicarrier direct-sequence code-division multiple-access (MC DS-CDMA) scheme, which employs both time (T)-domain and frequency (F)-domain spreading.
Hanzo, L., Wei, H., Yang, L-L.
core   +1 more source

Information theoretic analysis of LSD scheme [PDF]

, 2011
In this paper, the capacity region of Low Density Signature Multiple Access Channel (LDS-MAC) is calculated through information theoretic analysis. LDS Code Division Multiple Access (LDS-CDMA) uses spreading sequences of low density for spreading the ...
Hoshyar, R., Imran, M.A., Razavi, R., Wang, Y.   +3 more
core   +1 more source

Iterative Joint Channel Estimation and Multi-User Detection for Multiple-Antenna Aided OFDM Systems

, 2007
Multiple-Input-Multiple-Output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM) systems have recently attracted substantial research interest. However, compared to Single-Input-Single-Output (SISO) systems, channel estimation in the MIMO scenario
Akhtman, J, Hanzo, L., Jiang, M
core   +1 more source

Multiuser chirp modulation for underwater acoustic channel based on VTRM

International Journal of Naval Architecture and Ocean Engineering, 2017
In this paper, an ascheme is proposed for multiuser underwater acoustic communication by using the multi-chirp rate signals. It differs from the well known TDMA (Time Division Multiple Access), FDMA (Frequency Division Multiple Access) or CDMA (Code ...
Fei Yuan, Qian Wei, En Cheng
doaj   +1 more source

A novel uplink multiple access scheme based on TDS-FDMA

, 2011
This contribution proposes a novel time-domain synchronous frequency division multiple access (TDS-FDMA) scheme to support multi-user uplink application.
Chen, Sheng, Dai, Linglong, Wang, Zhaocheng   +2 more
core   +1 more source

Enhancing Quality of Service and Energy Efficiency in Wireless Sensor Networks through TDMA-Based Topology and Cross-Layer Approaches

Pakistan Journal of Engineering & Technology
It is necessary to continuously monitor the environment with the sensors in delay-sensitive wireless sensor network applications. The continuous monitoring operation results in higher energy consumption by the sensor nodes; wireless sensor networks are ...
Muhammad Junaid Iqbal, Shan Afzal, Usman Ahmed Raza   +2 more
doaj   +1 more source

Multifunctional MIMO systems: A combined diversity and multiplexing design perspective

, 2010
In this treatise we investigate the design alternatives of different multiple-input multiple-output schemes while considering the attainable diversity gains, multiplexing gains, and beamforming gains.
El Hajjar, Mohammed, Hanzo, Lajos
core   +1 more source

OFDMA/SC-FDMA aided space-time shift keying for dispersive multi-user scenarios

, 2013
Motivated by the recent concept of Space-Time Shift Keying (STSK) developed for achieving a flexible diversity versus multiplexing gain trade-off, we propose a novel Orthogonal Frequency Division Multiple Access (OFDMA)/Single Carrier Frequency Division ...
Chen, Sheng, Hanzo, Lajos, Mohammad, Ismat Kadir, Sugiura, Shinya, Zhang, Jiayi   +4 more
core   +1 more source