7,851 Hits in 7.6 sec

Optimal antenna diversity signaling for wide-band systems utilizing channel side information

E.N. Onggosanusi, A.M. Sayeed, B.D. Van Veen
2002 IEEE Transactions on Communications  
Optimal multi-antenna wide-band signaling schemes are derived for multipath channels assuming perfect channel state information at the transmitter.  ...  Several suboptimal variations are discussed for multiuser applications. The optimal signaling scheme given channel statistics at the transmitter is also derived.  ...  The use of channel side information (CSI) at the transmitter for narrow-band systems is discussed in [4] .  ... 
doi:10.1109/26.983329 fatcat:suy2k2j75fd4zbb66rrcwqxlfy

Enhancing the Channel Capacity of a Cellular Mobile System using Frequency Diversity

Aguodoh Patrick C., Chineke Hyacinth A.
2017 International Journal of Trend in Scientific Research and Development  
Multiple replicas of information signal are sent over several affected frequency band in this diversity. In a sufficient wide signal bandwidth, multipath components can resolve.  ...  This paper presents the technique that can enhance the channel capacity of a cellular mobile system.  ...  Multiple replicas of information signal are sent over several affected frequency band in this diversity. In a sufficient wide signal bandwidth, multipath components can resolve.  ... 
doi:10.31142/ijtsrd7015 fatcat:jpaldugvz5d3dfsva2jewgpjuq

Design of a Compact Dual-Band MIMO Antenna System with High-Diversity Gain Performance in Both Frequency Bands

Wazie M. Abdulkawi, Waqar Ahmad Malik, Sajjad Ur Rehman, Abdul Aziz, Abdel Fattah A. Sheta, Majeed A. Alkanhal
2021 Micromachines  
The MIMO antenna was designed and optimized to cover the dual-frequency bands; the first frequency band is a wide band, and it covers the frequency range of 1550–2650 MHz, while the other frequency band  ...  The overall electrical size of the whole dual-band MIMO antenna system is 0.3λ(W) × 0.3λ(L) × 0.008λ(H) for the lower frequency band.  ...  Acknowledgments: This Project was funded by the National Plan for Science, Technology and Innovation (MAARIFAH), King Abdulaziz City for Science and Technology, Kingdom of Saudi Arabia, Award Number (15  ... 
doi:10.3390/mi12040383 pmid:33916040 fatcat:dz67yaysbfaktmhvlbvhzotlzq

Statistical analysis of CQI reporting and MIMO utilization for downlink scheduling in live LTE mobile network

Igor Tomić, Đorđe Lukić, Milutin Davidović, Dejan Drajić, Predrag Ivaniš
2020 Telfor Journal  
In particular, the relationship between Channel Quality Indicator (CQI) and MIMO utilization in LTE Frequency Division Duplex (FDD) systems was examined using the statistical analysis.  ...  Data was collected from a mature mobile network deployed in typical frequency bands for LTE FDD used in Europe - Band 3, Band 7 and Band 20.  ...  Transmit diversity does not increase peak data rate but reduces the probability of fading dip and optimizes Bit Error Rate (BER) vs Signal to Noise Ratio (SNR) curve, decreasing BER and improving system  ... 
doi:10.5937/telfor2001008t fatcat:v664kkkuyracfiksw36yylfa2u

Smart Antennas: Technological Advances in Wireless Communication Networks

2022 Journal of Research in Science and Engineering  
This paper provides a general explanation of the requirements of antennas and antenna systems in recent high-speed and high-capacity wireless communication systems and the key technologies for satisfying  ...  transmitter and receiver system which performs spatial signal processing with multiple antennas by latest advanced antenna techniques.  ...  Fig. 3 illustrates the produced antenna pattern with 4 antennas. Forming nulls to co-channel interferers. Thus the system performance is optimized in terms of link quality and system capacity.  ... 
doi:10.53469/jrse.2022.04(05).21 fatcat:dfqo4mvrqbaf7mo7nr3iiwtaty

Frequency Domain Characterization of LoS Nonfading Indoor Wireless LAN Channel Employing Frequency and Polarization Diversity in the 63.4–65.4 GHz Band

A. Hammoudeh, D.A. Scammell
2004 IEEE Transactions on Vehicular Technology  
The performance of both diversity techniques when modulated signals with high data rates for multimedia applications are utilized is presented for maximum selection combining.  ...  polarized antennas in the frequency band 63.4-65.4 GHz.  ...  Block diagram of a wide-band frequency-diversity receiver system, using maximum selection combining with diversity branch signals separated by one channels bandwidth (155 MHz) together with the frequency  ... 
doi:10.1109/tvt.2004.830955 fatcat:uuphul72fzdxrpff3d2dqxcmpa

A Novel Multiple-Output DUSTF Coding on High Mobility MIMO-Wireless Communication Systems

Rina Pudji Astuti, Andriyan B. Suksmono, Sugihartono Sugihartono, Adit Kurniawan
2008 ITB Journal of Information and Communication Technology  
The proposed scheme can outperforms other previously published inner coding scheme for high mobility and high SNR. The system also achieves a good channel capacity.  ...  For such an environment, it is necessary to develop a system that has a higher spectrum efficiency and is able to mitigate selective fading problems.  ...  However, the transmission of wide band information signal is restricted by limited bandwidth of the radio channel.  ... 
doi:10.5614/itbj.ict.2008.2.2.1 fatcat:kireql5qdndu7jibdx3uiegrei

MIMO Communication System Optimization Using RNS

2018 The International Conference on Electrical Engineering  
the spatial multiplexing gain and improving the link reliability by antenna diversity [1], [2] .  ...  Unfortunately, the drawback for this topology is that the variation of OFDM signal amplitudes is very wide with high Peak-to-Average Power Ratio (PAPR), which introduces signal distortion when the dynamic  ...  Historical Background 2.1 Mimo system As shown in Fig. 1 , the MIMO system is an advanced antenna configuration that uses multiple antennas at both transmit and receive sides in the communication system  ... 
doi:10.21608/iceeng.2018.30180 fatcat:5a5wqwoopjgwdnkf7xmisgvnbm

Literature Survey for Transceiver Design in MIMO and OFDM Systems

Raja Muthalagu, Department of EEE, BITS, Pilani, Dubai Campus, Dubai, UAE
2018 Journal of Communications  
In order to exploit the benefits of MIMO and OFDM systems, precoding and/or joint precoding and decoding design for MIMO and OFDM systems is of great meaning and has been widely studied.  ...  and channel correlation information (CCI).  ...  The CSI at both ends comprises the estimated channel information and the information about the channel connection. For diverse sorts of CSI, distinctive transmit systems ought to be utilized.  ... 
doi:10.12720/jcm.13.2.45-59 fatcat:3klhlx46lbdj5fr4q3xtcwv6p4

Codebook Selection Strategies in Long-range Sub-1GHz WLANs

Stefan Aust, Venkatesha Prasad, Ignas G.M.M. Niemegeers
2014 Procedia Computer Science  
The emerging IEEE 802.11ah WLAN standard utilizes carrier frequencies at 900 MHz in the ISM-band and facilitates multi-antenna MIMO-OFDM.  ...  The new long-range WLANs will enable a simple and cost-efficient setup of wireless ambient systems, including smart city and smart grid communication networks.  ...  These new WLANs utilize communication protocols that take advantage of using multi-antenna systems.  ... 
doi:10.1016/j.procs.2014.05.407 fatcat:lbfyzyeyyjh3vgyngv73iz64la

Resource Management in Future Millimeter Wave Small-Cell Networks: Joint PHY-MAC Layer Design

Jia Shi, Haris Pervaiz, Pei Xiao, Wei Liang, Zan Li, Zhiguo Ding
2019 IEEE Access  
The millimeter wave (mmWave) frequency band will become a key enabler for future wireless systems currently facing the explosive growth of data traffic and the sparsity of the traditional ultra-high frequency  ...  (UHF) band.  ...  cost of mmWave antenna setup, signal processing overhead, and spatial diversity exploited by RB allocation. • How to minimize the burden for acquiring channel state information required by beamforming  ... 
doi:10.1109/access.2019.2920745 fatcat:5wd6br3gdbca7g2zt5lisafz6q

A New Millimeter Wave MIMO System for 5G Networks [article]

Mojtaba Ahmadi Almasi, Roohollah Amiri, Hani Mehrpouyan
2018 arXiv   pre-print
Our analysis demonstrates that the proposed MIMO system along with the optimal beam selection technique increases the average signal-to-noise ratio (SNR).  ...  Also, simulations show that the system achieves full-diversity gain.  ...  We also utilize an optimal beam selection technique integrated with Alamouti space-time block code (STBC) to obtain full-diversity gain.  ... 
arXiv:1807.04851v1 fatcat:rcb6ocp2vrb7bnovz5oisddpxe

Broadband RF communications in underwater environments using multi-carrier modulation

Brian Kelley, Kranthi Manoj, Mo Jamshidi
2009 2009 IEEE International Conference on Systems, Man and Cybernetics  
In addition, we discuss system optimization involving the elimination of the phase synthesizer and analog mixer through direct sampling of the RF antenna port.  ...  Alamouti diversity), and zero carrier frequency ultra wideband (UWB) wireless.  ...  We adopt a 10MHz (one sided) bandwidth model for the underwater channel.  ... 
doi:10.1109/icsmc.2009.5345980 dblp:conf/smc/KelleyMJ09 fatcat:ahhp5e7khnhojpeuyyoty7gw7q

A Comprehensive Study of Past, Present, and Future of Spectrum Sharing and Information Embedding Techniques in Joint Wireless Communication and Radar Systems

Muhammad Fahad Munir, Abdul Basit, Wasim Khan, Ahmad Saleem, AbdulRahman Al-salehi, Muhammad Inam Abbasi
2022 Wireless Communications and Mobile Computing  
Dual-Function Radar and Communication (DFRC) is an emerging field and bears vital importance for both civil and military applications for the last few years.  ...  Since hybridization of wireless communication and radar designs provoke diverse challenges, e.g., interference mitigation, secure mobile communication, improved bit error rate (BER), and data rate enhancement  ...  Recent developments of TMA in DFRC with each beampattern represent unique binary information. One of the main advantages of using TMA is the use of wide band instead of narrow band signals.  ... 
doi:10.1155/2022/9642849 fatcat:ojojnlkkzfeslaunciwpmul45a

Multiple-antenna techniques for wireless communications - a comprehensive literature survey

Jan Mietzner, Robert Schober, Lutz Lampe, Wolfgang Gerstacker, Peter Hoeher
2009 IEEE Communications Surveys and Tutorials  
Multiple antennas can be utilized in order to accomplish a multiplexing gain, a diversity gain, or an antenna gain, thus enhancing the bit rate, the error performance, or the signal-to-noise-plus-interference  ...  In particular, topics such as transmitter and receiver structures, channel coding, MIMO techniques for frequency-selective fading channels, diversity reception and space-time coding techniques, differential  ...  For example, optimized versions of delay diversity for ISI channels were suggested in [100] , [113] .  ... 
doi:10.1109/surv.2009.090207 fatcat:ki2ponfnp5ditjjbp7bsx5ncfm
« Previous Showing results 1 — 15 out of 7,851 results