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Blind recognition of space time block code in MIMO systems

DIGITAL SIGNAL PROCESSING 2018年 83卷 1-8页

作者： Chung Buiquang Zhang, Tianqi Univ Sci & Technol China Sch Informat Sci & Technol Hefei Anhui Peoples R China Chongqing Univ Post & Telecommun Sch Commun & Informat Engn Chongqing Peoples R China

space time block code (STBC) and vertical Bell layered space-time (VBLAST) signals are widely applied in multiple-input multiple-output (MIMO) systems, and one essential step in the signal interception process is to recognize STBC/VBLAST. As the STBC signal is correlated in time, it has a specific cyclic frequency in higher-order cyclic accumulation, while the VBLAST signal emitted from different antenna is uncorrelated. According to this property, this paper proposes a blind recognition approach for STBC/VBLAST signals based on fourth-order cyclic accumulation (FCC). The recognition process is divided into two steps. In the first step, we first establish the correlation choosing criteria that makes sure all correlations of STBC can generate a statistically cyclic sequence. The cyclic statistic then is estimated by combining the FCC with channel information that provides the peaks phase of the statistically cyclic sequence. The second step compares the estimated cyclic statistic with a detection threshold, which is obtained by given a probability of false alarms. The proposed approach avoids the need for any prior knowledge of the transmitted signal, and can work well in the lowly SNR by employing the advantages of FCC. (C) 2018 Elsevier Inc. All rights reserved.

关键词： space time block code Vertical Bell layered space time code Multiple-input multiple-output Fourth-order cyclic accumulation Blind recognition

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High-Rate Spatially Modulated space time block code

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IEEE COMMUNICATIONS LETTERS 2018年第12期22卷 2595-2598页

作者： Xuan Nam Tran Xuan-Nghia Nguyen Minh-Tuan Le Vu-Duc Ngo Le Quy Don Tech Univ Fac Elect & Commun Hanoi 11956 Vietnam MobiFone Corp Hanoi 11310 Vietnam HUST Sch Elect & Telecommun Hanoi 11657 Vietnam

A high-rate spatially modulated space-time block code (HRSM-STBC) based on golden code is presented in which the spatial constellation (SC) codewords and the core STBC code matrix are designed for two active antennas. In addition to the high rate of the core STBC, the number of SC codewords offered by the HRSM-STBC scheme is the largest as compared to existing schemes that have the same antenna configuration. Consequently, the proposed scheme can provide the highest spectral efficiency to date. To maximize the achievable coding gain and diversity, the optimization of the HRSM-STBC is carried out. Performance advantages of our proposed scheme over its existing counterparts such as STBC-SM, H-STBC-SM, STBC-CSM, and DT-SM are demonstrated.

关键词： Multi-input multi-output systems spatial modulation spatial constellation space time block code

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space-time block code Classification for MIMO Signals

Space-Time Block Code Classification for MIMO Signals

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22nd IEEE Signal Processing and Communications Applications Conference (SIU)

作者： Turan, Merve Oner, Menguc Cirpan, Hakan Ali Istanbul Tech Univ Elekt & Haberlesme Muh Bolumu Istanbul Turkey Isik Univ Elekt Elekt Muhendisligi Bolumu Istanbul Turkey

ISBN: (纸本)9781479948741

Signal identification techniques developed for the purpose of blind and noncooperative identification of the transmission parameters of unknown communication signals have been employed both in military and civilian applications. Blind identification of the space-time block codes (STBC) used in a multiantenna transmisson can be regarded as one of the new and most significant challenges presented to the signal identification systems by the Multiple-Input-Multiple-Output (MIMO) transmission systems. In this work, we present novel STBC classification algorithms that exploit the cyclostationary characteristics of the coded transmit signals as discriminating features.

关键词： MIMO space time block code signal identification classification

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Analysis of space time block codes and cosets for 5G and its applications

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COMPUTER COMMUNICATIONS 2020年 149卷 189-193页

作者： Asif, Hafiz M. Sultan Qaboos Univ Coll Engn Dept Elect & Comp Engn Muscat Oman

The key parameters of 5G communication technology includes high data rate and latency to support Internet of Things (IoTs) in future. There are many ways to boost up system capacity of 5G systems. In this work, design of an efficient space time block code (STBC) is presented based on maximum rank distance (MRD) codes that give enhanced system capacity in terms of diversity gain. The work also includes a comparative study of orthogonal STBC and all of its equivalent group codes including MRD for 2 transmit antennas and 1 receive antenna (2 x 1) STBCs. It is shown through simulation that MRD code and all other related coset codes can achieve full diversity gain for 2 x 1 scenario similar to what orthogonal codes can do. In addition, it is shown that orthogonal code generally outperforms all equivalent codes. A unique case is also discussed in which MRD code outperforms orthogonal STBC. Due to full diversity gain, these codes find their direct applications in 5G, Unmanned Aerial Vehicles (UAVs) used in sensor networks.

关键词： Internet of Things Sensor networks UAVs Alamouti code Maximum rank distance code Coset space time block code Diversity gain

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Performance Evaluation of UAV Aided Overlay Cognitive STBC-NOMA System 15

Performance Evaluation of UAV Aided Overlay Cognitive STBC-N...

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15th International Conference on Signal Processing and Communications (SPCOM)

作者： Pocha, Naveen Kumar Reddy Banavathu, Narasimha Rao Natl Inst Technol Andhra Pradesh Dept Elect & Commun Engn Tadepalligudem India

ISBN: (纸本)9798350350463;9798350350456

This paper investigates the performance of unmanned aerial vehicle (UAV) aided overlay cognitive network (OCN) with space time block code aided non-orthogonal multiple access (STBC-NOMA) technique. In the network, the UAV acts as a secondary transmitter which simultaneously transmit its information along with the decoded information from the primary transmitter to the respective users. The closed-form expressions of outage probability (OP) and ergodic rate (ER) of users are obtained. It is observed that the performance of OCN with STBC-NOMA scheme is superior to OCN with NOMA scheme in terms of OP and ER. Monte Carlo simulations are provided for verification of analytical expressions. Further, the optimal horizontal coordinates of the UAV are obtained using the exhaustive search.

关键词： non-orthogonal multiple access ergodic rate space time block code unmanned aerial vehicle

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Impact of Relay Location of STANC Bi-Directional Transmission for Future Autonomous Internet of Things Applications

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IEEE ACCESS 2020年 8卷 29395-29406页

作者： Tanoli, Shujaat Ali Khan Shah, Syed Aziz Khan, Muhammad Bilal Nawaz, Faiza Hussain, Amir Al-Dubai, Ahmed Y. Khan, Imran Shah, Syed Yaseen Alsarhan, Ayoub COMSATS Univ Islamabad Dept Elect & Comp Engn Islamabad 43600 Pakistan Manchester Metropolitan Univ Dept Comp & Math Manchester M15 6BH Lancs England Edinburgh Napier Univ Sch Comp Edinburgh EH11 4DY Midlothian Scotland Univ Engn & Technol Mardan Dept Elect Engn Mardan 23200 Pakistan Glagsow Caledonian Univ Sch Comp Engn & Built Environm Glasgow G4 0BA Lanark Scotland Hashemite Univ Dept Comp Informat Syst Zarqa 150459 Jordan

Wireless communication using existing coding models poses several challenges for RF signals due to multipath scattering, rapid fluctuations in signal strength and path loss effect. Unlike existing works, this study presents a novel coding technique based on Analogue Network Coding (ANC) in conjunction with space time block Coding (STBC), termed as space time Analogue Network Coding (STANC). STANC achieves the transmitting diversity (virtual MIMO) and supports big data networks under low transmitting power conditions. Furthermore, this study evaluates the impact of relay location on smart devices network performance in increasing interfering and scattering environments. The performance of STANC is analyzed for Internet of Things (IoT) applications in terms of Symbol Error Rate (SER) and the outage probability that are calculated using analytical derivation of expression for Moment Generating Function (MGF). In addition, the ergodic capacity is analyzed using mean and second moment. These expressions enable effective evaluation of the performance and capacity under different relay location scenario. Different fading models are used to evaluate the effect of multipath scattering and strong signal reflection. Under such unfavourable environments, the performance of STANC outperforms the conventional methods such as physical layer network coding (PNC) and ANC adopted for two way transmission.

关键词： Analogue network coding space time block code Internet of Things Nakagami-m fading channels Rician fading channels Rayleigh fading channels moment generating function.

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Improving Spectral Efficiency of Non-Orthogonal space time block coded-Continuous Phase Modulation

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IEICE TRANSACTIONS ON COMMUNICATIONS 2018年第9期E101B卷 2024-2032页

作者： Morioka, Kazuyuki Yamazaki, Satoshi Asano, David Natl Inst Maritime Port & Aviat Technol Elect Nav Res Inst Surveillance & Commun Dept Tokyo 1820012 Japan Numazu Coll Natl Inst Technol Dept Control & Comp Engn Numazu 4108501 Japan Shinshu Univ Dept Comp Sci & Engn Nagano 3808553 Japan

We consider space time block coded-continuous phase modulation (STBC-CPM), which has the advantages of both STBC and CPM at the same time. A weak point of STBC-CPM is that the normalized spectral efficiency (NSE) is limited by the orthogonality of the STBC and CPM parameters. The purpose of this study is to improve the NSE of STBC-CPM. The NSE depends on the transmission rate (TR), the bit error rate (BER) and the occupied bandwidth (OBW). First, to improve the TR, we adapt quasi orthogonal-STBC (QO-STBC) for four transmit antennas and quasi-group orthogonal Toeplitz code (Q-GOTC) for eight transmit antennas, at the expense of the orthogonality. Second, to evaluate the BER, we derive a BER approximation of STBC-CPM with non-orthogonal STBC (NO-STBC). The theoretical analysis and simulation results show that the NSE can be improved by using QO-STBC and Q-GOTC. Third, the OBW depends on CPM parameters, therefore, the tradeoff between the NSE and the CPM parameters is considered. A computer simulation provides a candidate set of CPM parameters which have better NSE. Finally, the adaptation of non-orthogonal STBC to STBC-CPM can be viewed as a generalization of the study by Silvester et al., because orthogonal STBC can be thought of as a special case of non-orthogonal STBC. Also, the adaptation of Q-GOTC to CPM can be viewed as a generalization of our previous letter, because linear modulation scheme can be thought of as a special case of non-linear modulation.

关键词： continuous phase modulation space time block code quasi orthogonal-space time block code group orthogonal toeplitz code

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Comparative performance analysis between STBC and SFBC on a non-Hermitian OFDM free-space optical system with polarization diversity

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OPTICAL AND QUANTUM ELECTRONICS 2021年第11期53卷 603-603页

作者： Islam, M. Shariful Majumder, S. P. Bangladesh Univ Engn & Technol BUET Dept EEE Dhaka Bangladesh Ahsanullah Univ Sci & Technol AUST Dept EEE Dhaka Bangladesh

In this paper, we proposed an analytical model for a non-Hermitian orthogonal frequency division modulation system considering space time block coding (STBC) with polarization diversity in presence of strong atmospheric turbulence and compare the bit error rate (BER) performance with the same system considering space frequency block coding (SFBC). We developed this analytical model to calculate the impact of crosstalk and fading on system performance due to cross polarization and strong atmospheric turbulence respectively. The analytical expressions for signal to noise plus crosstalk ratio are derived for a certain amount of random misalignment angle. We consider two different independent probability density functions one is Maxwellian distribution and another is Gamma-Gamma distribution for angular misalignment and strong turbulence respectively. The average BER is found by averaging the conditional BER over this two probability density functions. It is noticed that, receiver sensitivity improvement due to STBC coding is almost 4.5 dB at a BER of 10(-12) compare to 7.5 dB due to SFBC coding reported earlier by the authors. From the analytical results, we clearly found that SFBC coding performs better than STBC coding for the same system's constraints. Finally, results of our proposed work are verified with others earlier published results and it is found that our result is almost 2 dB better than the published results.

关键词： Free space optical Polarized beam combiner Bit error rate space time block code Polarized beam splitter

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Study on Quasi-Orthogonal space time block code Based on Amplify-and-Forward Relay Networks

Study on Quasi-Orthogonal Space Time Block Code Based on Amp...

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International Conference on Materials Science and Information Technology (MSIT 2011)

作者： Zhang Xueyi Sun Jie Hunan Univ Technol Coll Elect & Informat Engn Zhuzhou Hunan Peoples R China Southeast Univ Natl Mobile Commun Res Lab Nanjing Peoples R China

ISBN: (纸本)9783037853191

A kind of quasi-orthogonal space time block code for amplify-and-forward relay networks is analyzed in this paper. At the source, 4 single-antenna users transmit the quasi-orthogonal space time block code matrix. At the relay node, fast maximum-likelihood decoding algorithm is adopted and the decoded symbols are then encoded into quasi-orthogonal code which is transmitted through transmit antenna. At the destination, pair-wise decoding algorithm is utilized. Finally we compare the performance of the quasi-orthogonal space time block code in relay networks with that of the quasi-orthogonal space time block code in traditional communication system. Simulation results show that at the given BER of 10-3, the new code can provide about gain of 4dB and 1 dB comparing with that for the traditional quasi-orthogonal code, respectively. And at the given BER of 10-5, the new code can provide about gain of 4.6dB and 2.6dB comparing with that for the old quasi-orthogonal code, respectively.

关键词： quasi-orthogonal design space time block code bit error rate maximum likelihood decoding

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Multi-Dimensional space-time block Coding Aided Downlink MIMO-SCMA

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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2019年第7期68卷 6657-6669页

作者： Pan, Zhipeng Liu, Wei Lei, Jing Luo, Junshan Wen, Lei Tang, Chaojing Natl Univ Def Technol Sch Elect Sci Changsha 410073 Hunan Peoples R China

Multiple-input multiple-output (MIMO) and sparse code multiple access (SCMA) are two key techniques supporting high spectral efficiency and massive connectivity. In this paper, we consider the downlink MIMO communication scenario where SCMA is used for multiuser access. We aim to improve the performance of the traditional single-input single-output SCMA (SISO-SCMA) by exploiting the transmit diversity of multiple antennas at the transmitter. Specifically, we propose a multi-dimensional spacetime block code (MSTBC) aided downlink MIMO-SCMA and derive the design criteria of MSTBC that can achieve full diversity while keep the symbol rate same as the traditional SISO-SCMA-system. In particular, the MSTBC-2 for two transmit antennas and the MSTBC-4for four transmit antennas are designed by extending the Alamouti code and quasi-orthogonal STBC into multi-dimension. Due to the orthogonality/quasi-orthogonality of the two MSTBCs, a linear decoder is available at the receiver, which keeps the complexity of the proposed MSTBC aided MIMO-SCMA almost the same as the conventional SISO-SCMA. Furthermore, the performance of the proposed schemes is evaluated based on both Monte Carlo simulations and analytical results. Simulation results show that the proposed MSTBC aided MIMO-SCMA can significantly outperform the conventional SISO-SCMA, STBC-MIMO-OFDM, and multiplexing MIMO-SCMA schemes.

关键词： MIMO SCMA space time block code OSTBC QOSTBC average symbol error rate

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