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检索条件"主题词=Space Time Block Coding"

共 134 条记录，以下是111-120 订阅

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Decoding of Distributed Alamouti STBC in DF Based Cooperative System

Decoding of Distributed Alamouti STBC in DF Based Cooperativ...

引用

IEEE Vehicular Technology Conference

作者： Ankur Bansal Manav R. Bhatnagar Are Hjorungnes Department of Electrical Engineering Indian Institute of Technology Delhi UNIK-University Graduate Center University of Oslo

ISBN: (纸本)9781467318808

In this paper, we derive a maximum-likelihood (ML) decoder for the demodulate-and-forward (DF) based cooperative communication system using Alamouti space-time block code (STBC) in a distributed manner. We also propose a sub-optimal low complexity piece-wise linear (PL) decoder of the distributed Alamouti code in a DF cooperative system in which one relay out of two relays is in outage. The proposed PL decoder does not lead to any significant performance degradation and performs very close to the proposed ML decoder. Moreover, the proposed ML decoder of the DF cooperative system significantly outperforms an amplify-and-forward (AF) based cooperative system when both systems use the same data rate and distributed Alamouti STBC.

关键词： DEUTERIUM FLUORIDES cooperative systems space time block coding decoders DEcoding degradation of performance COMMUNICATION SYSTEMS Computer Programming Languages Distribute

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Modulation recognition of space-time block codes based on Fourth-order delay matrix

Modulation recognition of space-time block codes based on Fo...

引用

Signal, Information and Data Processing (ICSIDP), IEEE International Conference on

作者： Yu Keyuan Zhang Limin Jin Kun Yan Wenjun Liu Zhao Naval Aeronautical University Yantai China Naval Aeronautical University 188 Erma Road Yantai China 92429 army Qingdao

ISBN: (数字)9781728123455

ISBN: (纸本)9781728123462

In order to identify the modulation mode of STBC signal in frequency selective fading channel, an improved STBC modulation recognition algorithm based on fourth-order time delay moment is proposed in the condition of single receiving antenna. This algorithm calculates the fourth-order delay moment of spacetime block code at the receiving end, and uses threshold detection method to compare the estimated value of fourth-order delay moment with the threshold interval of theoretical value, and automatically identifies the modulation mode of signal. Simulation results show that the algorithm is not affected by adverse factors such as frequency deviation and phase jitter, and there is little difference between different STBC recognition effects.

关键词： space-time block codes fourth-order delay matrix modulation recognition signal identification space time block coding modulation mode signal recognition block codes Frequency-selective fading channels Phase jitter receiving end Recognition (Psychology) Frequency deviation Moment of force

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A distributed differential space-time coding with full interference cancellation scheme for a cooperative four relay network

A distributed differential space-time coding with full inter...

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Mosharaka International Conference on Communications, Computers and Applications, MIC-CCA

作者： Gaojie Chen Ousama Alnatouh Lu Ge Jonathon Chambers Advanced Signal Processing Group School of Electronic Electrical and Systems Engineering Loughborough University Loughborough Leicestershire UK

ISBN: (纸本)9781467352307

We propose the use of a distributed differential space-time code within a two-hop cooperative wireless four relay network, with partial channel information at the destination, over quasi-static Rayleigh fading channels, which can achieve full cooperative diversity and improve the transmission rate to approximately unit. In this scheme the four relay nodes are arranged as two groups of two relay nodes, both of which employ the distributed differential space time block coding design, but with offset transmission scheduling. Therefore, the source can serially transmit data to the destination and the overall rate can be improved. However, this transmission scheme may suffer from inter-relay interference which is caused by the simultaneous transmission of the source and another group of relays. A full interference cancellation (FIC) approach is therefore used to remove the inter-relay interference. Uncoded and coded bit error rate simulations confirm the utility of the scheme.

关键词： cooperative destination transmission destination Interference cancellation time coding Relay networks information channels Trunk Node simultaneous transmission space-time codes space time block coding relay Scheme TRANSMISSION RATE

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Multi-Antenna Uplink Transmission for LTE-A

Multi-Antenna Uplink Transmission for LTE-A

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IEEE Vehicular Technology Conference

作者： Yan Meng Gang Shen Jiyong Pang Wei Wang Feng Han Dongyao Wang Research and Innovation Center Alcatel-Lucent Shanghai Bell Co. Ltd

ISBN: (纸本)9781467318808

Clustered DFT-S-OFDM has been accepted as the uplink multiple access scheme for LTE-Advanced. In this paper, a new transmit diversity with four transmit antennas is proposed for Clustered DFT-S-OFDM system. A modified Frequency Switched Transmit Diversity (FSTD) algorithm is proposed, where the multiple clusters can be divided into two groups by four antennas, thus the number of clusters on each antenna will be reduced. As a result, the PAPR performance of each antenna has been improved. Meanwhile, in order to obtain additional frequency diversity gain, the proposed scheme has introduced more channels by a symbol-based dynamic cluster allocation method, which makes one turbo coded stream transmitted multiple channels. Moreover, the space-time block coding (STBC) is employed for the two antennas in each group to achieve spatial diversity and coding gain. Simulation results show that the proposed scheme has good PAPR and Bit block Error Rate (BLER) performance on frequency selective MIMO channels.

关键词： ANTENNA Frequency diversity diversity reception antennae up link block error probability transmitting antennas space time block coding spatial diversity multiple antenna Peak to average power ratio Local thermodynamic equilibrium

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Evaluation of soft detection of STBC schemes for turbo codes

Evaluation of soft detection of STBC schemes for turbo codes

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IEEE International Conference on Wireless and Mobile Computing, Networking and Communications

作者： Youngmin Kim Sooyoung Kim Division of Electronics Engineering Chonbuk National University Jeonju Korea 561-756

ISBN: (纸本)9781424477432

In this paper, we present an efficient turbo-coded space time block coding (STBC) schemes in block fading channels. It has been reported that proper utilization of soft decision information is one of the important factors affecting the performance of turbo codes. If a STBC scheme is used with turbo codes, the output of the STBC decoder must be fed into a turbo code decoder in the form of soft decision information. In addition, the performance of a turbo code is subject to how much diverse channel information a decoder can utilize in a codeword. In this paper we evaluate the performance of turbocoded STBC schemes over block fading channels, and present an efficient STBC scheme with very simple maximum likelihood detection capability.

关键词： soft decision space-time block coding time-varying channel turbo codes space time block coding turbo codes soft decision time-varying channels Fading channels

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Standard form for balanced complex orthogonal design

Standard form for balanced complex orthogonal design

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International Workshop on High Mobility Wireless Communications (HMWC)

作者： Xiaodong Liu Haibin Kan School of Computer Science Fudan University Shanghai

ISBN: (纸本)9781467363785

space-time block codes based on complex orthogonal design (COD) have been widely investigated for their attractive performance. Adams et al. constructed a class of balanced complex orthogonal designs (BCODs) which have rate 1/2 and decoding delay 2 m when n = 2m-1 or 2m. Comparing with the maximum rate CODs, the growth of decoding delay of BCODs is decreased from factorial order (2m:m+1) to exponential order 2 m , while the rate is decreased from (m+1)/2m to 1/2. In this paper, we focus on the study of the structure of BCODs. In order to keep the symmetric structure unchanged, we impose restrictions on the equivalence operations. Then by using the restricted narrow equivalence operations, we construct four submatrixes sequences for any BCOD, and then prove that all of these submatrixes have some symmetric characteristics in common. Based on those symmetric characteristics, we immediately define a standard form for BCODs. And finally we reach the conclusion that, for any BCOD, we can make it into another standard form BCOD under equivalence operations.

关键词： Scientific notation orthogonal designs block codes space time block coding ASSAY SCALE Equation equivalence CENTROSYMMETRIC Surgery

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Design of space-time block coded unique word OFDM systems

Design of space-time block coded unique word OFDM systems

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IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Sher Ali Cheema Jianshu Zhang Mario Huemer Martin Haardt Communication Research Laboratory Ilmenau University of Technology Germany Institute of Signal Processing Johannes Kepler University Linz Austria

ISBN: (纸本)9781509041183

In this paper we develop space-time block codes for unique word - orthogonal frequency division multiplexing (UW-OFDM) systems to fully exploit the diversity gain when the channel state information is not available at the transmitter. To this end, we propose two novel space-time block codes (STBCs) for UW-OFDM systems, namely a frequency domain space-time block code and a time-reversal space-time code (TR-STC). The former one is an extension of the traditional space-frequency block codes (SFBCs) for CP-OFDM systems to UW-OFDM systems while the latter one makes use of the frame structure of the UW-OFDM symbols and has a low complexity decoder. Simulation results show that both of the proposed space-time block codes achieve a significant gain compared to the SFBC based CP-OFDM. Moreover, the frequency domain STBC yields a slightly better performance as compared to the TR-STC but has a higher computational complexity.

关键词： Orthogonal Frequency Division Multiplexing (OFDM) Cyclic Prefix (CP) Unique Word (UW) space-time block Codes (STBCs) Multiple-Input Multiple-Output (MIMO) block codes Orthogonal frequency division multiplexing space time block coding FRAMED STRUCTURES Diversity methods Channel state information space-frequency block coding Word complexity classes Frequency-domain analysis Transmitters Not Available spacetime

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time-reversal space-time codes in asynchronous two-way double-antenna relay networks

Time-reversal space-time codes in asynchronous two-way doubl...

引用

IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Y. Liu W. Zhang P. C. Ching Dept. of Electron. Eng. Chinese Univ. of Hong Kong Hong Kong China

ISBN: (纸本)9781467369985

We consider an asynchronous two-way relay network, in which two double-antenna relays assist in the communication between two single-antenna terminals through analog network coding. The asynchronous transmission between relays and terminals causes symbol misalignments and results in diversity loss in space-time block code (STBC). We propose a zero-padded time-reversal quasi-orthogonal STBC that can achieve full diversity with low-complexity maximum likelihood (ML) decoding, given a bounded delay. With ML decoding, the proposed code is decomposed into several independent parts, which leads to single complex symbol decoding. Proof of full diversity is established, and the decoding complexity order is analyzed for the proposed design. Simulations confirm the full diversity gain. The bit error rate performance in asynchronous scenarios is almost the same as that in synchronous scenarios.

关键词： Asynchronous analog network coding full diversity maximum likelihood decoding space-time code two-way relay network space-time codes Asynchronous Relay networks bit error rate performance maximum likelihood decoding analog network Bidirectional DEcoding relay Bidirectional Network space time block coding Computer Programming Languages

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Reduced-Complexity Soft STBC Detection

Reduced-Complexity Soft STBC Detection

引用

IEEE Global Communications Conference

作者： Chao Xu Dandan Liang Shinya Sugiura Soon Xin Ng Lajos Hanzo School of ECS University of Southampton Toyota Central R&D Labs Inc.

ISBN: (纸本)9781467309202

In this paper, we propose to reduce the complexity of both the Approx-Log-MAP algorithm as well as of the Max-Log-MAP algorithm, which were designed for soft-decision-aided space-time block Code (STBC) detectors. First of all, we review the STBC design, which enables regular L-PSK/QAM detectors to be invoked in order to detect STBCs on a symbol-by-symbol basis. Secondly, we propose to operate the L-PSK/QAM aided STBC detection on a bit-by-bit basis, so that the complexity may be reduced from the order of O(L) to O(BPS = log_2 L). Our simulation results demonstrate that a near-capacity performance may be achieved by the proposed detectors at a substantially reduced detection complexity. For example, a factor six complexity reduction was achieved by the proposed algorithms, when they were invoked for detecting Alamouti's Square 16QAM aided G2 scheme.

关键词： space time block coding OPERATING LIMIT detector Complexity Signs and symbols Simulation results

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Performance Analysis of Diagonal Precoding for Alamouti STBC over Nakagami-m Fading Channels

Performance Analysis of Diagonal Precoding for Alamouti STBC...

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IEEE Vehicular Technology Conference

作者： Ankit Garg Manav R. Bhatnagar Department of Electrical Engineering Indian Institute of Technology-Delhi

ISBN: (纸本)9781509016990

In this paper, we study the problem of one bit imperfect feedback based diagonal precoding for Alamouti space-time block code in a 2 × 1 multiple-input single-output (MISO) communication system. The communication links are assumed to be Nakagami-m distributed. An accurate bit error rate (BER) expression of the considered MISO system is derived with erroneous feedback by using the order statistics. The average BER of the precoding scheme is minimized to find the optimized transmit weights. Further, we also derive the Shannon capacity of the scheme by using the moment generating function approach. Simulated and analytical results show that a significant capacity gain is achieved by the considered scheme as compared to the uniform power allocation over the Nakagami-m fading channels.

关键词： space time block coding prediction coding Moment generating function Fading channels Bit error rate power splitting Diagonal multiple-input single-output Telecommunication links

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