Results 1 - 10 of 263,234

A simple transmit diversity technique for wireless communications

by Siavash M. Alamouti - IEEE Journal on Selected Areas in Communications , 1998
"... Abstract — This paper presents a simple two-branch transmit diversity scheme. Using two transmit antennas and one receive antenna the scheme provides the same diversity order as maximal-ratio receiver combining (MRRC) with one transmit antenna, and two receive antennas. It is also shown that the sch ..."
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Abstract — This paper presents a simple two-branch transmit diversity scheme. Using two transmit antennas and one receive antenna the scheme provides the same diversity order as maximal-ratio receiver combining (MRRC) with one transmit antenna, and two receive antennas. It is also shown

With Transmit Diversity

by Justin Coon, Student Member, Mark Beach, Associate Member, Joe Mcgeehan
"... Link to published version (if available): ..."
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Link to published version (if available):

Transmit Diversity with Channel Feedback

by Krishna Kiran Mukkavilli, Ashutosh Sabharwal, Michael Orchard, Behnaam Aazhang - in Proceedings International Symposium on Telecommunications , 2001
"... Transmit diversity in the presence of channel feedback at the transmitter is analyzed in this paper. We first consider perfect channel feedback and summarize the beamforming solution which minimizes the codeword error probability. We note that the error probability minimizing scheme is different fro ..."
Abstract - Cited by 5 (2 self) - Add to MetaCart
Transmit diversity in the presence of channel feedback at the transmitter is analyzed in this paper. We first consider perfect channel feedback and summarize the beamforming solution which minimizes the codeword error probability. We note that the error probability minimizing scheme is different

Transmit Diversity with Constrained Feedback

by Leonid G. Krasny, Jiann-ching Guey, Ali Khayrallah
"... antenna systems are attractive for achieving diversity in the downlink of cellular systems. However, closed-loop transmission scheme requires the terminal to use the uplink channel to inform the base station the full state of its downlink channels. The amount of feedback is proportional to the numbe ..."
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to the number of transmit an-tennas and the channel’s delay spread, and it can be substantial. In this paper we present an alternative transmit diversity scheme called TDCF (Transmit Diversity with Constrained Feedback) which uses only partial channel feedback. Our approach is based on approximation

A differential detection scheme for transmit diversity

by Vahid Tarokh, Hamid Jafarkhani - IEEE J. Select. Areas Commun , 2000
"... Abstract—We present a transmission scheme for exploiting diversity given by two transmit antennas when neither the transmitter nor the receiver has access to channel state information. The new detection scheme can use equal energy constellations and encoding is simple. At the receiver, decoding is a ..."
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Abstract—We present a transmission scheme for exploiting diversity given by two transmit antennas when neither the transmitter nor the receiver has access to channel state information. The new detection scheme can use equal energy constellations and encoding is simple. At the receiver, decoding

Joint beamforming and transmit diversity for WCDMA

by Mário Marques, Silva Américo Correia - Joint RTO IST and SET Symposium on ‘Smart Antennas’, RTO-MP-119 , 2003
"... The current work develops an efficient scheme to be used for the downlink of a WCDMA network, using transmitter diversity and beamforming. The performances of space-time transmit diversity (STTD) in combination with selective transmit diversity (STD), beamforming (BF) and beam sele ctive transmit di ..."
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The current work develops an efficient scheme to be used for the downlink of a WCDMA network, using transmitter diversity and beamforming. The performances of space-time transmit diversity (STTD) in combination with selective transmit diversity (STD), beamforming (BF) and beam sele ctive transmit

On Optimality of Closed-Loop Transmit Diversity

by Jyri Hämäläinen, Risto Wichman
"... Transmit diversity techniques provide attractive solutions for increasing downlink capacity in 3G systems within low--mobility environments, and open--loop and closed--loop transmit diversity modes with two transmit antennas have already been included into 3GPP WCDMA specification. In this paper we ..."
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Transmit diversity techniques provide attractive solutions for increasing downlink capacity in 3G systems within low--mobility environments, and open--loop and closed--loop transmit diversity modes with two transmit antennas have already been included into 3GPP WCDMA specification. In this paper we

Transmit Diversity with Interference Suppression in EDGE

by Björn Beckius, Ericsson Infotech Ab, Björn Ottersten, Henrik Sahlin, Håkan Lidman, Kai Yu, Ein/r/t Björn Beckius, Nr No, Ein/r/t Henrik Sahlin , 2001
"... The third generation mobile systems are under development and one of the systems that is considered is EDGE or Enhanced Data rates for Global Evolution. In this thesis the focus for improved bit rates is on transmit diversity and on interference suppression by whitening of the interferer. Two transm ..."
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The third generation mobile systems are under development and one of the systems that is considered is EDGE or Enhanced Data rates for Global Evolution. In this thesis the focus for improved bit rates is on transmit diversity and on interference suppression by whitening of the interferer. Two

Spectrum-Efficient OFDM Transmit Diversity

by Minho Jo, Dong-ku Kim , 2008
"... In this paper, we propose a subcarrier allocation method and a composite linear minimum mean square error (LMMSE) channel estimator to increase spectrum efficiency in orthogonal frequency division multiplexing (OFDM) transmit diversity. The pilot symbols for OFDM transmit (Alamouti) diversity are ex ..."
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In this paper, we propose a subcarrier allocation method and a composite linear minimum mean square error (LMMSE) channel estimator to increase spectrum efficiency in orthogonal frequency division multiplexing (OFDM) transmit diversity. The pilot symbols for OFDM transmit (Alamouti) diversity

Feasibility of Transmit Diversity for IS-136 TDMA Systems

by Ying-chang Liang, Ye (geoffrey Li, K. J. Ray Liu
"... Abstract- In this paper, we investigate the performance of transmit diversity technique operating in IS-136 TDMA systems where the Doppler frequency can be as high as 184Hz. Transmit diversity transforms a pat fading channel into a frequency selective fading channel, thus we use finite length decisi ..."
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Abstract- In this paper, we investigate the performance of transmit diversity technique operating in IS-136 TDMA systems where the Doppler frequency can be as high as 184Hz. Transmit diversity transforms a pat fading channel into a frequency selective fading channel, thus we use finite length
Results 1 - 10 of 263,234