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检索条件"主题词=Space-Time Block Coding"

共 247 条记录，以下是31-40 订阅

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A new transmit scheme combining beamforming with space-time block coding

A new transmit scheme combining beamforming with space-time ...

引用

IEEE International Conference on Communications (ICC 2008)

作者： Lin, Min Yang, Luxi Zhu, Wei-Ping Li, Min Li, Bin Southeast Univ Sch Informat Sci & Engn Nanjing 210096 Jiangsu Peoples R China Nanjing Inst Telecommun Technol Nanjing 210096 Jiangsu Peoples R China Concordia Univ Dept Elect & Comp Engn Quebec City H3G1M8 PQ Canada Huawei Technol Co Ltd Shenzhen 518129 Peoples R China

ISBN: (纸本)9781424420742

In this paper, a new transmit scheme combining beamforming (BF) with space-time block coding (STBC) is proposed for correlated fading channels. Based on maximizing the output mean signal-to-noise ratio (SNR) at the receiver, the transmitter BF weight vectors are first derived. Then, utilizing the minimal bit error rate (BER) upper bound as the design criterion, a simple power allocation algorithm is developed. Next, the BER performance of the system with the proposed transmit scheme is analyzed by considering an M-QAM constellation. Finally, computer simulation results are given to verify the effectiveness of the proposed scheme.

关键词： beamforming BER correlated fading channel space-time block coding multi-antenna communication

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Adaptive transmit beamforming with space-time block coding for correlated MIMO fading channels

Adaptive transmit beamforming with space-time block coding f...

引用

IEEE International Conference on Communications (ICC 2007)

作者： Lin, Min Li, Min Yang, Luxi You, Xiaohu Southeast Univ Coll Informat Sci & Engn Jiangsu 210096 Peoples R China Nanjing Inst Telecommun Technol Jingasu 210007 Peoples R China Nanjing Inst Commun Engn Jingasu 210007 Peoples R China

ISBN: (纸本)9781424403523

In this paper, we present an open-loop transmit scheme for MIMO communications. We first use the uplink channel correlation matrix (UCCM) to calculate the array weight vectors for downlink beamforming (DLBF). Then based on the symbol error rate (SER) upper bound as design criterion, we derive an algorithm for adaptive power allocation among multiple beams, and thus develop the transmit scheme joint adaptive beamforming (ABF) with space-time block coding (STBC). The main benefit of the scheme is that it can almost achieve the optimal performance with low complexity. Next, using the moment generation function (MGF) approach and the Gauss-Chebyshev integration, we derive a simple and accurate numerical analysis method for the proposed scheme under three widely used modulations. Finally, computer simulation results demonstrate the superiority of the open-loop transmit scheme.

关键词： adaptive beamforming space-time block coding transmit scheme MIMO communication

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MQAM space-time block coding with differential detection

MQAM space-time block coding with differential detection

引用

International Symposium on Communications and Information Technologies (ISCIT2005)

作者： Yu, XB Xu, DZ Bi, GG Nanjing Univ Aeronaut & Astronaut Coll Informat Sci & Technol Nanjing 210016 Peoples R China

ISBN: (纸本)0780395387

On the basis of analyzing of some existing differential space-time coding (DSTC) schemes, we develop a differential space-time block coding scheme based on multiple levels quadrature amplitude modulation (MQAM) in this paper. By introducing MQAM, the developed scheme can avoid the performance loss of conventional DSTC schemes based on MPSK modulation due to the decrease of minimum distance between constellation symbols in high spectrum efficiency. Compared with the existing DSTC schemes, the developed scheme has lower computational complexity and simple decoder. Moreover, it can achieve higher code rate in the case of more than two transmitter antennas. Theoretic analysis shows that the scheme has higher coding gain than existing differential unitary space-time coding scheme and differential orthogonal space-time coding scheme, and corresponding simulation results also show that our scheme has lower bit error rate (BER) when compared with the above two schemes.

关键词： space-time block coding differential detection quadrature amplitude modulation multiple levels

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Construction of Polar Codes Concatenated to space-time block coding in MIMO System 84

Construction of Polar Codes Concatenated to Space-Time Block...

引用

84th IEEE Vehicular Technology Conference (VTC-Fall)

作者： Feng, Bowen Jiao, Jian Wang, Sha Wu, Shaohua Zhang, Qinyu Harbin Inst Technol Commun Engn Res Ctr Shenzhen Grad Sch Harbin Guangdong Peoples R China

ISBN: (纸本)9781509017010

To enhance the performance in practical communications, a novel construction of polar code is designed for a rational polar and space-time block coding (Polar-STBC) system. The Polar-STBC system can be equivalent to a single transmission channel for each polar code bit in Rayleigh fading MIMO channels, and the equivalent channel can be regarded as a fading channel, of which the gain coefficient and additive noise are studied. Moreover, the distribution of the additive noise is also derived. Finally, we show that the bit error rate performance of our Polar-STBC system in 2 x 2, 4 x 2 and 4 x 4 MIMOs.

关键词： Polar code space-time block coding fading channel construction algorithm

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Linear Precoding for Layered space-time block coding With Correlation Feedback 10

Linear Precoding for Layered Space-Time Block Coding With Co...

引用

10th International Conference on Information, Communications and Signal Processing (ICICS)

作者： Zhao, Lan Nanjing Inst Technol Sch Automat Nanjing 211167 Jiangsu Peoples R China

ISBN: (纸本)9781467372183

We propose a linear precoder for the layered space-time block coding system [2] over spatially correlated channels with channel covariance matrix feedback at the transmitter. The precoder is a combination of the well known waterfilling solution and the precoder for spatial multiplexing system that minimizes the probability of decoding error. At the receiver, decoding schemes of group zero-forcing and group minimum mean squared error with successive interference cancellation are utilized to decode the transmitted signals. Simulation results demonstrate the superiority of the combined linear precoder over the pure waterfilling solution or the spatial multiplexing precoder in correlated channel. This conclusion confirms the intuition that the optimal linear precoding should be robust to both the space-time block coding and spatial multiplexing systems.

关键词： space-time block coding V-BLAST precoding correlated channels

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Detection schemes for distributed space-time block coding in time-varying wireless cooperative systems

Detection schemes for distributed space-time block coding in...

引用

IEEE Region 10 Conference (TENCON 2005)

作者： Cheng, Ho Ting Lok, Tat M. Chinese Univ Hong Kong Dept Informat Engn Shatin Hong Kong Peoples R China

ISBN: (纸本)9780780393110

In this paper, we investigate the influence of time-varying channels on the bit-error-rate (BER) performance for distributed space-time block coded system. We make use of pilot symbol assisted modulation (PSAM) to estimate the time-varying channel coefficients. We assess the performance of different reception methods, one of which is our newly considered receiver called cooperative maximum likelihood detector. The others are maximum likelihood detection in [12], Alamouti's receiver, zero-forcing detection and decision-feedback detection. Our results show that all detection methods, except cooperative maximum likelihood detection, achieve nearly the same BER performance over time-varying channels, unlike the results obtained in [12] by assuming perfect channel estimation. In many cases, cooperative maximum likelihood detection performs better by about 5dB due to the diversity gain. In addition, we have found that the time-varying nature contributes to the error flooring effect.

关键词： cooperative communications space-time block coding fading channels time-varying

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Maximum-likelihood detection for distributed space-time block coding

Maximum-likelihood detection for distributed space-time bloc...

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60th IEEE Vehicular Technology Conference

作者： Uysal, M Mheidat, H Univ Waterloo Dept Elect & Comp Engn Waterloo ON N2G 3L1 Canada

ISBN: (纸本)0780385217

We investigate maximum likelihood (ML) sequence estimation for distributed space-time block coded cooperative diversity schemes m-er time-varying fading channels without assuming channel knowledge. The quadratic form of the ML receiver in this case does not readily lend itself to efficient implementation. However, under quasi-static channel conditions, the likelihood function reduces to a simple form similar to the classical correlation receiver in matrix notation. It also allows the development of a recursive expression that can be easily implemented by a Viterbi-type algorithm with a reasonable complexity. Although the receiver is sub-optimum for the non-static case its performance is close to the optimum for a range of SNRs. It also outperforms pilot symbol assisted techniques, which are widely used in practical applications.

关键词： cooperative diversity space-time block coding maximum likelihood sequence estimation fading channels

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Combining beamforming and quasi-orthogonal space-time block coding using channel mean feedback

Combining beamforming and quasi-orthogonal space-time block ...

引用

IEEE Global Telecommunications Conference (GLOBECOM 03)

作者： Liu, L Jafarkhani, H Univ Calif Irvine Dept Elect Engn & Comp Sci Irvine CA 92717 USA

ISBN: (纸本)0780379748

Recently, Jongren-Skoglund-Ottersten and Zhou-Giannakis proposed new design criterion and algorithm that combine the space-time block coding with linear beamforming. This method is very successful when it is applied to the orthogonal space-time block code (STBC). However, the same method cannot be directly applied to the more advanced quasi-orthogonal STBCs due to the non-orthogonal nature of the quasi-orthogonal designs. In this paper, based on the same design criterion, we consider the quasi-orthogonal codes as beamforming candidates. Through asymptotic analysis, we dramatically simplify the design criterion and construct the beamforming matrix for the quasi-orthogonal designs. The proposed quasi-orthogonal STBC beamformer can be presented as a novel full rate eigen-beamformer that works for any systems with four or more transmit antennas. Simulation results for a system with channel mean feedback demonstrate that the new beamforming scheme has significant gains over the orthogonal STBC based beamforming schemes.

关键词： beamforming fading quasi-orthogonal designs space-time block coding

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Decision Feedback Detection for space-time block coding over time-Selective Fading Channels

Decision Feedback Detection for Space-Time Block Coding over...

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69th IEEE Vehicular Technology Conference

作者： Yu, Donghun SAIT Commun Lab Yongin 446712 Kyunggido South Korea

ISBN: (纸本)9781424425167

Decision feedback detectors for space-time block coding are proposed to combat time-selective fading. Although there are many conventional detectors, better performance is obtained if non-linear techniques are used. If we first detect the most reliable element of the transmitted vector and use it to improve the detection of the other elements of the transmitted vector, better performance can be achieved. In this paper, we propose zero forcing decision feedback detector and MMSE decision feedback detector for space-time block coding. It is shown by simulations that the proposed decision feedback detectors outperform the conventional detectors when the channel is time-selective fading.

关键词： Detectors time-selective fading channels Decision feedback detection MIMO systems space-time block coding

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Iterative joint decision feedback equalization and decoding for chip space-time block coding in WCDMA systems using long scrambling codes

Iterative joint decision feedback equalization and decoding ...

引用

15th IEEE International Symposium on Personal, Indoor, Mobile, Radio Communications (PIMRC 2004)

作者： Casella, IRS Sousa, ES Jeszensky, PJE Univ Sao Paulo Lab Comunicacoes & Sinais Escola Politecn BR-05508 Sao Paulo Brazil

ISBN: (纸本)0780385233

space-time block coding has emerged as a promising spatial transmit diversity scheme to reduce the fading effects of multipath channels and to increase system capacity, mainly due to its reduced decoding complexity and that channel state information is not required at the transmitter side. Recently, iterative processing has also attracted vast attention for improving system performance at low complexity cost. In this paper, we propose a new chip space-time block coding structure that employs iterative joint decision feedback equalization and decoding scheme for improving the performance of the downlink of a WCDMA system using long scrambling codes under frequency selective fading channels. Simulation results show that the presented schemes offer significant performance improvement against conventional disjoint receivers.

关键词： space-time block coding iterative receiver WCDMA multipath

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