The Experts below are selected from a list of 150 Experts worldwide ranked by ideXlab platform
Lajos Hanzo - One of the best experts on this subject based on the ideXlab platform.
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Analysis of Serial Search Based Code Acquisition in Multiple Transmit Antenna Aided DS-CDMA Downlink
2005Co-Authors: S-h. Won, Lajos HanzoAbstract:In this contribution we investigate the serial search based initial code acquisition performance of DSCDMA employing Multiple Transmit Antennas both with and without Post-Detection Integration (PDI), when communicating over uncorrelated Rayleigh channels. We characterise the associated performance trends as a function of the number of Transmit Antennas. It is demonstrated that in contrast to our expectation, the achievable correct detection probability PD degrades at low c o E /I values, as the number of Transmit Antennas is increased. It is extremely undesirable to degrade the achievable acquisition performance, when the system is capable of attaining its target bit error rate performance at reduced SINR values, as a benefit of employing Multiple Transmit Antennas. Our future research will focus on the study of designing iterative turbo-like acquisition schemes designed for MIMO systems.
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Comparative study of concatenated turbo coded and space-time block coded as well as space-time trellis coded OFDM
IEEE VTS 53rd Vehicular Technology Conference Spring 2001. Proceedings (Cat. No.01CH37202), 1Co-Authors: T. H. Liew, Byoung-jo Choi, Lajos HanzoAbstract:Space-time block codes provide substantial diversity advantages for Multiple Transmit Antenna systems at a low decoding complexity. In this study, we concatenate both space-time block and trellis codes with turbo convolutional (TC) coded orthogonal frequency division Multiplexing (OFDM) for achieving a high coding gain. The associated performance and complexity of the coded OFDM schemes is compared.
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GLOBECOM - Concatenated space-time block codes and TCM, turbo TCM, convolutional as well as turbo codes
Globecom '00 - IEEE. Global Telecommunications Conference. Conference Record (Cat. No.00CH37137), 1Co-Authors: T. H. Liew, J. Pliquett, B.l. Yeap, Lie-liang Yang, Lajos HanzoAbstract:Space-time block codes provide substantial diversity advantages for Multiple Transmit Antenna systems at a low decoding complexity. We concatenate space-time codes with convolutional codes (CC), turbo convolutional codes (TC), turbo BCH codes (TBCH), trellis coded modulation (TCM) and turbo trellis coded modulation (TTCM) schemes for achieving a high coding gain. The associated performance and complexity of the the coding schemes is compared.
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Analysis of serial search based code acquisition in the Multiple Transmit Antenna aided DS-CDMA downlink
VTC-2005-Fall. 2005 IEEE 62nd Vehicular Technology Conference 2005., 1Co-Authors: Seunghwan Won, Lajos HanzoAbstract:In this contribution we investigate the serial search based initial code acquisition performance of DSCDMA employing Multiple Transmit Antennas both with and without Post-Detection Integration (PDI), when communicating over uncorrelated Rayleigh channels. We characterise the associated performance trends as a function of the number of Transmit Antennas. It is demonstrated that in contrast to our expectation, the achievable correct detection probability D P degrades at low o c I E / values, as the number of Transmit Antennas is increased. It is extremely undesirable to degrade the achievable acquisition performance, when the system is capable of attaining its target bit error rate performance at reduced SINR values, as a benefit of employing Multiple Transmit Antennas. Our future research will focus on the study of designing iterative turbo-like acquisition schemes designed for MIMO systems.
Harald Haas - One of the best experts on this subject based on the ideXlab platform.
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on space frequency coding using cyclic delay diversity for ofdm based transmission systems
European Transactions on Telecommunications, 2003Co-Authors: Axel Huebner, Frank Schuehlein, Martin Bossert, Elena Costa, Harald HaasAbstract:We present a space-frequency coding scheme using cyclic delay diversity (CDD) for an orthogonal frequency division Multiplexing (OFDM)-based transmission system. CDD is a simple Multiple Transmit Antenna approach for increasing the frequency selectivity of the channel seen at a single Antenna receiver. This is due to the insertion of virtual echoes caused by Antenna specific cyclic delays in the time domain at the Transmitter. On each Antenna a shifted version of the signal is sent, with these shifts being performed in the frequency domain. This allows the receiver to apply optimum demodulation, and thus exploit the diversity introduced by CDD. We optimize the selection of the time domain cyclic delays in the CDD so as to get full spatial diversity with the proposed space-frequency codes with CDD (SFC-CDDs) scheme. Moreover, we show simulation results for SFC-CDD, which confirm theoretical results with respect to the achieved spatial diversity, and present a comparison with the well-known Alamouti scheme implemented as SFC.
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On space‐frequency coding using cyclic delay diversity for OFDM‐based transmission systems
European Transactions on Telecommunications, 2003Co-Authors: Axel Huebner, Frank Schuehlein, Martin Bossert, Elena Costa, Harald HaasAbstract:We present a space-frequency coding scheme using cyclic delay diversity (CDD) for an orthogonal frequency division Multiplexing (OFDM)-based transmission system. CDD is a simple Multiple Transmit Antenna approach for increasing the frequency selectivity of the channel seen at a single Antenna receiver. This is due to the insertion of virtual echoes caused by Antenna specific cyclic delays in the time domain at the Transmitter. On each Antenna a shifted version of the signal is sent, with these shifts being performed in the frequency domain. This allows the receiver to apply optimum demodulation, and thus exploit the diversity introduced by CDD. We optimize the selection of the time domain cyclic delays in the CDD so as to get full spatial diversity with the proposed space-frequency codes with CDD (SFC-CDDs) scheme. Moreover, we show simulation results for SFC-CDD, which confirm theoretical results with respect to the achieved spatial diversity, and present a comparison with the well-known Alamouti scheme implemented as SFC.
Seunghwan Won - One of the best experts on this subject based on the ideXlab platform.
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Analysis of serial search based code acquisition in the Multiple Transmit Antenna aided DS-CDMA downlink
VTC-2005-Fall. 2005 IEEE 62nd Vehicular Technology Conference 2005., 1Co-Authors: Seunghwan Won, Lajos HanzoAbstract:In this contribution we investigate the serial search based initial code acquisition performance of DSCDMA employing Multiple Transmit Antennas both with and without Post-Detection Integration (PDI), when communicating over uncorrelated Rayleigh channels. We characterise the associated performance trends as a function of the number of Transmit Antennas. It is demonstrated that in contrast to our expectation, the achievable correct detection probability D P degrades at low o c I E / values, as the number of Transmit Antennas is increased. It is extremely undesirable to degrade the achievable acquisition performance, when the system is capable of attaining its target bit error rate performance at reduced SINR values, as a benefit of employing Multiple Transmit Antennas. Our future research will focus on the study of designing iterative turbo-like acquisition schemes designed for MIMO systems.
Axel Huebner - One of the best experts on this subject based on the ideXlab platform.
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on space frequency coding using cyclic delay diversity for ofdm based transmission systems
European Transactions on Telecommunications, 2003Co-Authors: Axel Huebner, Frank Schuehlein, Martin Bossert, Elena Costa, Harald HaasAbstract:We present a space-frequency coding scheme using cyclic delay diversity (CDD) for an orthogonal frequency division Multiplexing (OFDM)-based transmission system. CDD is a simple Multiple Transmit Antenna approach for increasing the frequency selectivity of the channel seen at a single Antenna receiver. This is due to the insertion of virtual echoes caused by Antenna specific cyclic delays in the time domain at the Transmitter. On each Antenna a shifted version of the signal is sent, with these shifts being performed in the frequency domain. This allows the receiver to apply optimum demodulation, and thus exploit the diversity introduced by CDD. We optimize the selection of the time domain cyclic delays in the CDD so as to get full spatial diversity with the proposed space-frequency codes with CDD (SFC-CDDs) scheme. Moreover, we show simulation results for SFC-CDD, which confirm theoretical results with respect to the achieved spatial diversity, and present a comparison with the well-known Alamouti scheme implemented as SFC.
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On space‐frequency coding using cyclic delay diversity for OFDM‐based transmission systems
European Transactions on Telecommunications, 2003Co-Authors: Axel Huebner, Frank Schuehlein, Martin Bossert, Elena Costa, Harald HaasAbstract:We present a space-frequency coding scheme using cyclic delay diversity (CDD) for an orthogonal frequency division Multiplexing (OFDM)-based transmission system. CDD is a simple Multiple Transmit Antenna approach for increasing the frequency selectivity of the channel seen at a single Antenna receiver. This is due to the insertion of virtual echoes caused by Antenna specific cyclic delays in the time domain at the Transmitter. On each Antenna a shifted version of the signal is sent, with these shifts being performed in the frequency domain. This allows the receiver to apply optimum demodulation, and thus exploit the diversity introduced by CDD. We optimize the selection of the time domain cyclic delays in the CDD so as to get full spatial diversity with the proposed space-frequency codes with CDD (SFC-CDDs) scheme. Moreover, we show simulation results for SFC-CDD, which confirm theoretical results with respect to the achieved spatial diversity, and present a comparison with the well-known Alamouti scheme implemented as SFC.
Li Ping - One of the best experts on this subject based on the ideXlab platform.
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On a Hybrid Beamforming/Space-Time Coding Scheme
IEEE Communications Letters, 2004Co-Authors: Li Ping, Linrang Zhang, H.c. SoAbstract:A Multiple Transmit Antenna system based on hybrid beamforming and space-time coding technologies is examined. The reduction factor of the required Transmitted energy achievable by the use of hybrid scheme is quantified for any given outage capacity. We show that although a sole space-time coding configuration is superior asymptotically (i.e., for extremely low outage requirements), a hybrid beamforming/space-time coding configuration can be a more effective solution for modest outage requirements. It may provide a useful design guideline for wireless systems, especially for the downlink where Multiple Transmit Antenna scheme is feasible.
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a simple approach to near optimal Multiple Transmit Antenna space time codes
International Conference on Communications, 2003Co-Authors: W K Leung, Li PingAbstract:This paper presents a family of space-time codes employing interleavers to separate signals form different Antennas. Noticeable performance improvement has been observed compared with existing schemes. An interactive detection algorithm is derived. The complexity involved is very low, and increases only linearly with the number of Transmit Antennas.
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ICC - A simple approach to near-optimal Multiple Transmit Antenna space-time codes
IEEE International Conference on Communications 2003. ICC '03., 1Co-Authors: W K Leung, Li PingAbstract:This paper presents a family of space-time codes employing interleavers to separate signals form different Antennas. Noticeable performance improvement has been observed compared with existing schemes. An interactive detection algorithm is derived. The complexity involved is very low, and increases only linearly with the number of Transmit Antennas.
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Interleave-division-Multiplexing space-time codes
The 57th IEEE Semiannual Vehicular Technology Conference 2003. VTC 2003-Spring., 1Co-Authors: W K Leung, Li PingAbstract:This paper presents a family of interleaving based space-time codes. We employ low-rate turbo-type codes to exploit the expansion of the signaling dimension due to the use of Multiple Transmit Antennas. Low-cost iterative detection algorithms are derived to treat both cross Antenna interference and intersymbol interference. The complexity involved increases only linearly with Transmit Antenna number and quadratically with path number. The proposed scheme can achieve performance close to the capacity of Multiple Transmit Antenna systems.
