Results 201 to 210 of about 40,980 (259)

Transmit diversity in LTE network

2013 21st Telecommunications Forum Telfor (TELFOR), 2013
This paper investigate the effect of transmit diversity in LTE downlink transmission. Transmit diversity scheme known as Space Frequency Block Codes (SFBC) is considered. As performances metrics, the average BER is evaluated in terms of signal to interference-plus-noise ratio (SINR).
Andrei Vasile Iordache, Ion Marghescu
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Transmit diversity for TDD systems

SPIE Proceedings, 2002
Multiple input multiple output (MIMO) communications have been a hot research area in recent years. Most literature makes the assumption that the channel information is not known at the transmitter but known perfectly at the receiver. We focus on the situation where both the transmitter and the receiver know the channel information.
Jibing Wang, Kung Yao
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Transmit diversity in mobile communications

14th International Conference on Microwaves, Radar and Wireless Communications. MIKON - 2002. Conference Proceedings (IEEE Cat.No.02EX562), 2003
This paper shows the transmit diversity (TD) techniques in applications for communication systems. General classification of the TD techniques for both TDMA and CDMA systems is presented. Some very promising TD techniques are characterized, i.e. code division TD (CDTD) and the time division TD (TDTD).
R. Katulski, M. Mikolajski
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Transmit diversity and spatial multiplexing in four-transmit-antenna OFDM

IEEE International Conference on Communications, 2003. ICC '03., 2004
This paper studies a practical design for achieving both spatial diversity and spatial multiplexing in an OFDM system with four transmit antennas. In a certain range of spectral efficiency, the proposed hybrid space-time block coding/multiple-input multiple-output (STBC/MIMO) design is found to be a good design choice based on performance and receiver ...
null Xiangyang Zhuang, F.W. Vook, S. Rouquette-Leveil, K. Gosse   +3 more
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Why Downlink Cyclic Delay Diversity Helps Uplink Transmit Diversity

VTC Spring 2009 - IEEE 69th Vehicular Technology Conference, 2009
In this paper, we show that the use of cyclic delay diversity (CDD) on the downlink (DL) can improve the performance of uplink (UL) diversity methods such as antenna selection in a time-division duplexing (TDD) system. An analytical framework for showing why CDD transmission on the DL improves UL diversity transmission in TDD system is provided.
Louay M. A. Jalloul, Nicolai Czink, Bertrand M. Hochwald, Arogyaswami Paulraj   +3 more
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Transmit diversity schemes for CDMA-2000

WCNC. 1999 IEEE Wireless Communications and Networking Conference (Cat. No.99TH8466), 2003
Transmit diversity offers an advantage in the forward link of the cdma2000 system by balancing the spectrum efficiency in the uplink and downlink. Three schemes for performing transmit diversity are examined in this paper-orthogonal transmit diversity, time switched transmit diversity, and selection transmit diversity for vehicular, indoor-outdoor ...
D. Rajan, S.D. Gray
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Transmit antenna diversity for wireless communications

Proceedings IEEE International Conference on Communications ICC '95, 2002
Increased demand for wireless communications in the workplace and for cellular communications has revitalized the concept of spaced antenna diversity. Both transmit and receive diversity are being explored to increase the capacity and improve the performance of wireless communication systems.
H.K. Mecklai, R.S. Blum
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Transmit diversity in the DFM system

2010 International Conference on Computer Application and System Modeling (ICCASM 2010), 2010
Targeting to the DFM system, which is a digital version of FM and used in the VHF-FM band, the paper proposes a scheme of multimode OFDM-parameters design. The design can not only counteract the multi-path delay and Doppler shift of the DRM-Plus-related wireless channel, but also reduce the implementation complexity.
null Pengjun Wang, null Shuzheng Xu, null Huazhong Yang   +2 more
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Differential Multiple-Length Transmit Diversity

IEEE Communications Letters, 2004
We propose a new bandwidth-efficient differential transmit diversity scheme as an extension of differential space-time block codes from orthogonal designs. The information is coded in both the difference of successive unit-length vectors and the length difference of successive transmit vectors.
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Transmit Diversity Schemes for WCDMA

Wireless Personal Communications, 2003
Previous work on transmitter antenna diversity has shown that the use of multiple transmitter antennas at the base station results in improved performance due to increase of diversity (path diversity). This happens with no bandwidth cost, even when the signal quality along several paths is poor, but the receiver estimates the channel with accuracy ...
openaire   +1 more source