Results 261 to 270 of about 49,554 (306)

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 ...
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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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Integration of transmit power control, transmit diversity and receive beamforming

ICC 2001. IEEE International Conference on Communications. Conference Record (Cat. No.01CH37240), 2002
In this paper an algorithm for joint power control, transmit diversity and receive beamforming is proposed where transmit diversity and receive beamforming weight vectors and downlink power allocations are calculated jointly such that signal to interference ratio at each mobile is above threshold.
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On transmit diversity for TD-SCDMA

The 57th IEEE Semiannual Vehicular Technology Conference, 2003. VTC 2003-Spring., 2004
In TD-SCDMA (UMTS TDD 1.28 Mcps mode) advanced techniques such as closed loop transmit diversity (CLTD) are foreseen. Deployment of CLTD influences the choice of receiver architecture and depends on propagation conditions, mobile speed, feedback delay, antenna weight computation and quantization.
I. Held, A. Kerroum
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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 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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An algorithm for generalized transmit diversity

GLOBECOM'01. IEEE Global Telecommunications Conference (Cat. No.01CH37270), 2002
In this paper an algorithm for generalized transmit diversity is proposed. Depending on the signal-to-interference-plus-noise ratio maximization criterion full diversity (all available transmit antennas) or partial diversity (only subset of all available transmit antennas) is used and phase adjustment is applied between selected antennas.
D.M. Novakovic, M.J. Juntti, M.L. Dukic
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Transmit diversity and transmit adaptive arrays for broadband mobile OFDM systems

2003 IEEE Wireless Communications and Networking, 2003. WCNC 2003., 2005
This paper explores the performance of several frequency-domain transmit array processing strategies for broadband mobile turbo-coded OFDM systems. We consider transmit adaptive array (TXAA) techniques (also known as maximal ratio transmission) with various assumptions on mobile- to-base channel response feedback in a two-transmit antenna OFDM system ...
Frederick W. Vook, Timothy A. Thomas, Xiangyang Zhuang   +2 more
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Transmit Diversity Based Interference Cancellation

VTC Spring 2008 - IEEE Vehicular Technology Conference, 2008
In this paper, we describe a transmit diversity technique for canceling partially-known interference. For a single interferer in a flat fading channel, the desired user transmitter transmits conjugated and time-reversed interferer symbols in two successive symbol periods (or subcarriers) along with one desired user symbol.
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Closed-loop transmit diversity schemes for five and six transmit antennas

IEEE Signal Processing Letters, 2005
Closed-loop, rate-one, channel orthogonalized space-time block codes (CO-STBCs) for three and four transmit antennas using a single (real) phase feedback term have been proposed . These codes achieve full diversity and result in maximum likelihood (ML) decoding with only linear processing at the receiver similar to OSTBCs.
J. Klutto Milleth, Krishnamurthy Giridhar, Devendra Jalihal   +2 more
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