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Journal articles on the topic 'Alamouti STBC'

Author: Grafiati
Published: 4 June 2021
Last updated: 30 January 2023

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1

Ciflikli, Cebrail. "Combining Alamouti Scheme with Block Diagonalization Beamforming precoding for 5G Technology over Rician Channel." Infocommunications journal, no. 1 (2019): 22–28. http://dx.doi.org/10.36244/icj.2019.1.3.

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Wireless communication faces a number of adversities and obstacles as a result of fading and co-channel interference (CCI). Diversity with beamformer techniques may be used to mitigate degradation in the system performance. Alamouti space-time-block-code (STBC) is a strong scheme focused on accomplishing spatial diversity at the transmitter, which needs a straightforward linear processing in the receiver. Also, high bit-error-rate (BER) performance can be achieved by using the multiple-input multiple-output (MIMO) system with beamforming technology. This approach is particularly useful for CCI suppression. Exploiting the channel state information (CSI) at the transmitter can improve the STBC through the use of a beamforming precoding. In this paper, we propose the combination between Alamouti STBC and block diagonalization (BD) for downlink multi-user MIMO system. Also, this paper evaluates the system performance improvement of the extended Alamouti scheme, with the implementation of BD precoding over a Rayleigh and Rician channel. Simulation results show that the combined system has performance better than the performance of beamforming system. Also, it shows that the combined system performance of extended Alamouti outperforms the combined system performance without extended Alamouti. Furthermore, numerical results confirm that the Rician channel can significantly improve the combined system performance.
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2

Kaur, Satwinder, Lavish Kansal, Gurjot Singh Gaba, and Mohannad A. M. Al-Ja'afari. "BER Assessment of FBMC Systems Augmented with Different Space-Time Coding Schemes Over Diverse Channels." International Journal of Engineering & Technology 7, no. 3.8 (July 7, 2018): 111. http://dx.doi.org/10.14419/ijet.v7i3.8.16844.

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Diverse methodologies of encoding schemes like space-time block codes (STBC), orthogonal space-time block codes (OSTBC) &quasi-orthogonal space-time block codes (QOSTBC) are being proposed as alternatives of basic Alamouti space-time encoding scheme for multiple input multiple output (MIMO) scheme for existing wireless communication systems. Since filter bank multi-carrier (FBMC) scheme is an integral part of the 5th generation (5G) cellular systems, the performance of these schemes needs to be investigated for FBMC methodology also. Alamouti and Space-time block codes are widely used in MIMO system because of their ability to achieve full diversity and the different channels are used at the receiver. In this work, we proposed different approaches for the bit error rate (BER) of Alamouti, STBC3, and STBC4 in FBMC. These approaches are based on the type of space-time encoding and number of receiving antennas being used for each space time encoding scheme for analyzing the MIMO-FBMC. Moreover, we also investigation the performance of these proposed MIMO schemes over Rayleigh and additive white Gaussian noise (AWGN) channel and compared it with the performance of BER or signal to noise ratio (SNR) of different channels.
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3

Halmi, Mohd H., Mohamad Y. Alias, and Chuah T. Chee. "Decoding alamouti STBC from received signal power." IEICE Electronics Express 6, no. 5 (2009): 249–55. http://dx.doi.org/10.1587/elex.6.249.

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4

Tsiligkaridis, Theodoros, and Douglas L. Jones. "PAPR Reduction Performance by Active Constellation Extension for Diversity MIMO-OFDM Systems." Journal of Electrical and Computer Engineering 2010 (2010): 1–5. http://dx.doi.org/10.1155/2010/930368.

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The V-BLAST wireless communication architecture, space-time block code (STBC), and space-frequency block code (SFBC) techniques are strong candidates for achieving very high data rates in 4G broadband wireless communications. This paper extends the efficient Active Constellation Extension Smart Gradient-Project (ACE-SGP) peak-to-average power (PAPR) reduction method to STBC, SFBC, and V-BLAST systems. Simulation results show 4.19 and 3.57 dB of PAPR reduction for the Alamouti STBC and SFBC, respectively.
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5

Louet, Yves, Rami Othman, and Alexandre Skrzypczak. "A Soft-Output STBC Decoder for Aeronautical Telemetry." Journal of Telecommunications and Information Technology 1 (March 31, 2020): 13–20. http://dx.doi.org/10.26636/jtit.2020.138319.

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Alamouti encoding is a well-known space time block encoding technique used to improve the received signal quality in Rayleigh fading channels. In aeronautical telemetry, this encoding technique is applied to shaped offset quadrature phase shift keying tier generation (SOQPSK-TG) modulation in order to handle the two-antenna issue. It is provided for in telemetry-related IRIG standards. In this paper, we propose a unique decoding architecture for Alamouti-encoded SOQPSK-TG signals, taking advantage of pulse amplitude modulation decomposition with soft and hard outputs. We exploit this result to obtain a Viterbi algorithm (VA) for hard decoding and a soft output Viterbi algorithm (SOVA) for soft and hard decoding, with a twofold benefit: operation using one trellis structure, unlike decoders that are based on the 8-waveforms cross-correlated trellis-coded quadrature modulation (XTCQM) approximation, and very attractive bit error rate performance, as well as a complexity trade-off
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6

Anoh, K. O. O., O. Ochonogor, R. A. A. Abd-Alhameed, S. M. R. Jones, and T. T. Mapuka. "Improved Alamouti STBC Multi-Antenna System Using Hadamard Matrices." International Journal of Communications, Network and System Sciences 07, no. 03 (2014): 83–89. http://dx.doi.org/10.4236/ijcns.2014.73010.

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7

Eldemerdash, Yahia A., Octavia A. Dobre, and Bruce J. Liao. "Blind Identification of SM and Alamouti STBC-OFDM Signals." IEEE Transactions on Wireless Communications 14, no. 2 (February 2015): 972–82. http://dx.doi.org/10.1109/twc.2014.2363093.

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8

Yuan-Hwui Chung and See-May Phoong. "Unitary Precoders for ST-OFDM Systems Using Alamouti STBC." IEEE Transactions on Circuits and Systems I: Regular Papers 55, no. 9 (October 2008): 2860–69. http://dx.doi.org/10.1109/tcsi.2008.921062.

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9

Hu, Feng, Li Biao Jin, and Jian Zeng Li. "A Parallel Space-Time Block Code Based Transmission Scheme." Advanced Materials Research 605-607 (December 2012): 1959–64. http://dx.doi.org/10.4028/www.scientific.net/amr.605-607.1959.

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We present a new transmit strategy based on modified Alamouti codes for the simple two branch transmit diversity scheme. The OFDM payload cells from the output of the frequency interleaver is done on one transmit antenna, and the encoding is proceeded on another branch. The proposed encoding scheme can significantly simplify the processes of transforming SISO into MIMO in wireless communication systems. The scheme may easily be generalized to two transmit antennas and M receive antennas to provide a diversity order of 2M, its coding gain is similar to Alamouti code. Computer simulations are performed to investigate the performance of the proposed parallel STBC scheme in a multi-input (MI) system.
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10

Niu, Mingbo, Julian Cheng, and Jonathan F. Holzman. "Alamouti-Type STBC for Atmospheric Optical Communication Using Coherent Detection." IEEE Photonics Journal 6, no. 1 (February 2014): 1–17. http://dx.doi.org/10.1109/jphot.2014.2302807.

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11

Marey, Mohamed, and Octavia A. Dobre. "Blind Modulation Classification for Alamouti STBC System With Transmission Impairments." IEEE Wireless Communications Letters 4, no. 5 (October 2015): 521–24. http://dx.doi.org/10.1109/lwc.2015.2451174.

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12

Bakir, H. A., F. Debbat, and F. T. Bendimerad. "Performance Comparison of STBC-OFDM with Maximum Likelihood Detection for Rayleigh Fading Channel." International Journal of Engineering Research in Africa 26 (October 2016): 111–21. http://dx.doi.org/10.4028/www.scientific.net/jera.26.111.

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The combined system STBC-OFDM has considered an important association to integrate into actual and next wireless system. Such as the Wifi standard, WiMAX standard, the LTE fourth generation of mobile. Which combat the effect of multipath fading channel that limited the performance in wireless communications. In recent years, this association has been a large study to achieve a better performance of BER and designed for the different situation of the wireless channel from slow to fast fading channel, with various parameters of OFDM modulation and under different condition of STBC code. To contribute in this axis of research, we present a comparative study of the simulation result for STBC-OFDM. The first results are the comparison between three schemes of STBC (Alamouti code, Orthogonal STBC, Non-Orthogonal STBC) associated with OFDM. The second results are the comparison between three schemes when applied OFDM in different parameters and also when these codes used without OFDM modulation. The channel considered across simulation is Rayleigh fading channel that presented a real situation of the wireless environment, the Maximum Likelihood (ML) is used for detection the data that encoded in the first. The performance of three schemes is evaluated by BER (Bit Error Rate) versus the different values of SNR (Signal Noise Ratio).
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13

Song, Wei, and Bing Guan. "Reconfigurable Intelligent Surface-Based Space-Time Block Transmission on 6G." Wireless Communications and Mobile Computing 2021 (December 16, 2021): 1–9. http://dx.doi.org/10.1155/2021/5569006.

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Reconfigurable intelligent surface (RIS) is considered to be a new technology with great potential and is being studied extensively and deeply. And the application extension of STBC in the RIS-aided scheme provides a new train of thought for the research of channel coding. In this paper, we propose we extend the scheme of using the RIS to adjust the phase and reconfigure the reflected signal and propose the design of the RIS-aided QO-STBC scheme and the RIS-aided QO-STBC scheme with interference cancellation. Particularly in the RIS-aided QO-STBC scheme with interference cancellation, the design can achieve the transmission of the full rate and full diversity using an auxiliary reflection group to eliminate the influence of interference term. Also, the advantages and disadvantages of the schemes are analyzed in the paper, and the decoding algorithms with different complexity used in the proposed schemes are described. The simulation results show that the performance of the RIS-aided QO-STBC scheme with interference cancellation is better than that of the RIS-aided QO-STBC scheme and the RIS-aided Alamouti scheme by about 5 dB and 7 dB at 1 0 − 3 BER because of diversity gain and coding gain.
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14

Ha, Daehan, Hoojin Lee, and Joonhyuk Kang. "Error performance analysis of STBC‐Alamouti and STBC‐CIOD with phase estimation error over Nakagami‐ m fading channels." Electronics Letters 52, no. 6 (March 2016): 452–54. http://dx.doi.org/10.1049/el.2015.4241.

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15

Harlen, Sekar, Eva Yovita Dwi Utami, and Andreas Ardian Febrianto. "Bit Error Rate pada Sistem MIMO MC-CDMA dengan Teknik Alamouti-STBC." Techné : Jurnal Ilmiah Elektroteknika 16, no. 02 (October 2, 2017): 99–109. http://dx.doi.org/10.31358/techne.v16i02.163.

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Pada makalah ini dilaporkan hasil penelitian sistem MIMO MC-CDMA dengan teknik Alamouti Space Time Block Code (STBC) menggunakan dua antena pengirim dan dua antena penerima. Kinerja sistem diukur dengan nilai Bit Error Rate (BER). Sistem yang diteliti disimulasikan dengan Matlab, dengan variasi jumlah pengguna, jumlah subpembawa, kecepatan pergerakan pengguna dan frekuensi Doppler. Hasil simulasi menunjukkan BER sistem MIMO MC-CDMA tidak mengalami penurunan yang tajam ketika jumlah pengguna dan frekuensi Doppler meningkat. Sedangkan simulasi dengan peningkatan jumlah subpembawa mampu menurunkan nilai BER sistem. Simulasi juga menunjukkan sistem MIMO-MC-CDMA memiliki kinerja sistem yang lebih baik dibandingkan sistem MC-CDMA yang ditunjukkan dengan nilai BER sistem MIMO MC-CDMA berada pada orde 10-4 dan sistem MC-CDMA pada orde 10-1.
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16

Gong, Feng-Kui, Guo Li, Jianhua Ge, and Jinhong Yuan. "Distributed Concatenated Recursive Alamouti-Circulant STBC for Two-Way Multi-Relay Networks." IEEE Transactions on Communications 64, no. 8 (August 2016): 3262–74. http://dx.doi.org/10.1109/tcomm.2016.2589269.

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17

Legnain, Rajab M., Roshdy H. M. Hafez, and Ian D. Marsland. "BER Analysis of Three-Phase XOR-and-Forward Relaying Using Alamouti STBC." IEEE Communications Letters 16, no. 9 (September 2012): 1458–61. http://dx.doi.org/10.1109/lcomm.2012.072012.120989.

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18

Marey, Mohamed, Octavia A. Dobre, and Robert Inkol. "A Novel Blind Block Timing and Frequency Synchronization Algorithm for Alamouti STBC." IEEE Communications Letters 17, no. 3 (March 2013): 569–72. http://dx.doi.org/10.1109/lcomm.2013.13.122518.

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19

Ali, Noor S., Kasim K. Abdalla, and Sameer A. Kadhim. "BER Performance Improvement of Alamouti MIMO-STBC Decoder Using Mutual Information Method." Journal of Physics: Conference Series 1530 (May 2020): 012016. http://dx.doi.org/10.1088/1742-6596/1530/1/012016.

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20

Bansal, Ankur, Manav R. Bhatnagar, and Are Hjorungnes. "Decoding and Performance Bound of Demodulate-and-Forward Based Distributed Alamouti STBC." IEEE Transactions on Wireless Communications 12, no. 2 (February 2013): 702–13. http://dx.doi.org/10.1109/twc.2012.121412.120145.

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21

Widjaja, Damar, and Yakobus Agung Purwanto. "Transmisi Data Citra pada Sistem Komunikasi Nirkabel dengan Teknik MIMO." KONSTELASI: Konvergensi Teknologi dan Sistem Informasi 1, no. 2 (April 22, 2021): 430–41. http://dx.doi.org/10.24002/konstelasi.v1i2.4304.

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Wireless data communication systems using Multiple Input Multiple Output (MIMO) technique in its transmission system has been well developed to solve many transmission media problems. This study aims to analyse the performance of MIMO 2x2 and MIMO 4x4 using image data. Encoding technique that is used in this study is Space Time Block Coding (STBC) by Alamouti. The result of this study shows that wireless communication system using MIMO technique is able to recover the image data on the receiver side the same as the image data on the transmitter side when SNR = 6.5dB for MIMO 2x2 and SNR = 4.5dB for MIMO 4x4.
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22

Zou, Qi Feng, Xue Zhi Tan, and Mei Liu. "Iterative Frequency Domain Equalization for Single-Carrier Space Time Diversity Systems." Advanced Materials Research 926-930 (May 2014): 1818–21. http://dx.doi.org/10.4028/www.scientific.net/amr.926-930.1818.

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Single carrier frequency domain equalization (SC-FDE) has been receiving much attention for its advantage of suppressing inter-symbol interference (ISI). We proposed a frequency domain iterative decision feedback equalization (FD-IDFE) algorithm for single carrier space time block coding (STBC) systems. The paper use the multi-antenna transmit and Alamouti signaling scheme to achieve the significant diversity gain. We design the feedback equalization structure by Mean Square Error (MSE) criterion and Lagrange optimization method, and we also consider the parameters estimation. At last, we compare the proposed algorithm with the conventional equalization schemes, the simulation results illustrate that our method has excellent performance.
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23

Islam, MS, M. Morshed, RC Roy, and MHA Begum. "Analytical approach of an FSO Link with alamouti- type STBC considering weak atmospheric turbulence." Bangladesh Journal of Scientific and Industrial Research 53, no. 3 (September 18, 2018): 205–10. http://dx.doi.org/10.3329/bjsir.v53i3.38267.

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An analytical approach is proposed to evaluate the bit error rate (BER) performance of a direct detection on-off keying (OOK) free space optical link over log-normal atmospheric turbulence-induced fading channels based on modified Alamouti code presented by Simon and Vilnrotter and maximal ratio combining (MRC) at the receiver. Simulations show that due to coding and diversity at the receiver, a significant improvement in the BER performance is obtained at a given BER. For diversity order of 2 in both transmitter and in receiver, the amount of BER improvement is 6.6dB at BER 10-5. Further increment of the receiver diversity from 2 to 4 gives additional 3dB improvement at the same BER. A drastic improvement of the BER performance is also possible for increasing number of receiver diversity which may increase hardware complexity. Simulation results are demonstrated to confirm the analytical results.Bangladesh J. Sci. Ind. Res.53(3), 205-210, 2018
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24

BAI, ZHIQUAN, YUANQUAN XU, XIAOTONG LI, RONGKAI LI, DONGFENG YUAN, and KYUNGSUP KWAK. "MIMO DS-BPAM UWB SYSTEM WITH SRAKE RECEIVER OVER MULTIPATH FADING CHANNELS." Journal of Circuits, Systems and Computers 18, no. 06 (October 2009): 1075–80. http://dx.doi.org/10.1142/s021812660900554x.

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In this paper, we investigate the multiple input multiple output (MIMO) direct sequence bipolar pulse amplitude modulation (DS-BPAM) ultra wideband (UWB) system over indoor multipath fading channels based on the research of Alamouti space-time block codes (STBC) and DS-BPAM UWB system. Selective Rake (SRake) receiver is employed in this paper in order to deal with the multipath effects. Theoretical bit error probability of the MIMO DS-BPAM UWB system with SRake receiver is derived. Simulation results of the MIMO DS-BPAM UWB system with SRake receiver and conventional coherent receiver over multipath fading channels are provided. The results show the efficiency of the MIMO DS-BPAM UWB system with SRake receiver.
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25

Patra, Jyoti Prasanna, and Poonam Singh. "A Novel LMMSE-EM Channel Estimator for High Mobility STBC-OFDM System." Journal of Circuits, Systems and Computers 28, no. 13 (February 20, 2019): 1950223. http://dx.doi.org/10.1142/s0218126619502232.

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In time-selective fading channel, the Alamouti orthogonality principle is lost due to the variation of channel from symbol-to-symbol in space–time block-coded orthogonal frequency division multiplexing (STBC-OFDM) system and causes co-channel interference (CCI) effects. To combat the CCI effects, various signal detection schemes have been proposed earlier by assuming that a priori channel state information (CSI) is known to the receiver. However, in practice, the CSI is unknown and therefore accurate estimation of channel is required for efficient signal detection. In this paper, by exploiting circulant properties of the channel frequency response (CFR) autocorrelation matrix [Formula: see text], we propose an efficient low complexity linear-minimum-mean-square-error (LMMSE) estimator. This estimator applies an expectation–maximization (EM) iterative process to reduce the computational complexity significantly. Finally, we compare the proposed LMMSE-EM estimator with conventional least square (LS) and LMMSE estimator in terms of performance and computational complexity. The simulation results show that the proposed LMMSE-EM estimator achieves exactly the same performance as the optimal LMMSE estimator with much lower computational complexity.
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26

Almradi, Ahmed M., and Sohail A. Dianat. "NDA SNR and CRLB Estimation Over MISO with STBC Channels." International Journal of Business Data Communications and Networking 8, no. 4 (October 2012): 1–16. http://dx.doi.org/10.4018/jbdcn.2012100101.

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This paper discusses the problem of Non Data Aided (NDA) Signal to Noise Ratio (SNR) estimation of Binary Phase Shift keying (BPSK) modulated signals using the Expectation Maximization (EM) Algorithm. In addition, the Cramer-Rao Lower Bounds (CRLB) for the estimation of Data Aided (DA) and Non Data Aided (NDA) Signal to Noise Ratio (SNR) estimation is derived. Multiple Input Single Output (MISO) channels with Space Time Block Codes (STBC) is used. The EM algorithm is a method that finds the Maximum Likelihood (ML) solution iteratively when there are unobserved (hidden or missing) data. Extension of the proposed approach to other types of linearly modulated signals in estimating SNR is straight forward. The performance of the estimator is assessed using the NDA CRLBs. Alamouti coding technique is used in this paper with two transmit antennas and one receive antenna. The authors’ assumption is that the received signal is corrupted by additive white Gaussian noise (AWGN) with unknown variance, and scaled by fixed unknown complex channel gain. Monte Carlo simulations are used to show that the proposed estimator offers a substantial improvement over the conventional Single Input Single Output (SISO) NDA SNR estimator due to the use of the statistical dependences in space and time. Moreover, the proposed NDA SNR estimator works close to the NDA SNR estimator over Single Input Multiple Output (SIMO) channels.
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27

Alrufaiaat, Sameer Abdul Kadhim, and Awwab Qasim Jumaah Althahab. "A new DOA estimation approach for QPSK Alamouti STBC using ICA technique-based PSO algorithm." International Journal of Communication Systems 32, no. 2 (November 18, 2018): e3858. http://dx.doi.org/10.1002/dac.3858.

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28

Fereidountabar, Amirhossein, and Gian Carlo Cardarilli. "Radio Link Design for Unmanned Aerial Vehicles (UAVs) with SQAM/TQAM Configuration and Alamouti/STBC Codes." International Journal on Communications Antenna and Propagation (IRECAP) 5, no. 4 (August 31, 2015): 241. http://dx.doi.org/10.15866/irecap.v5i4.7059.

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29

Mesbahul Alam, M., A. Z. M. Touhidul Islam, and S. Enayet Ullah. "Performance Analysis of a Concatenated LDPC Coded Alamouti-Based STBC-OFDM System on Text Message Transmission." International Journal of Computer Science, Engineering and Applications 1, no. 3 (June 20, 2011): 1–9. http://dx.doi.org/10.5121/ijcsea.2011.1301.

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30

Liu, Tsung-Hsien. "Analysis of the Alamouti STBC MIMO System With Spatial Division Multiplexing Over the Rayleigh Fading Channel." IEEE Transactions on Wireless Communications 14, no. 9 (September 2015): 5156–70. http://dx.doi.org/10.1109/twc.2015.2433924.

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31

Torabi, Mohammad, and Chahe Nerguizian. "Impact of Antenna Correlation on the BER Performance of a Cognitive Radio Network with Alamouti STBC." IEEE Wireless Communications Letters 5, no. 3 (June 2016): 264–67. http://dx.doi.org/10.1109/lwc.2016.2536723.

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32

Almawgani, Abdulkarem Hussein Mohammed, Motea Alsamawi, and Waled Hussein Al-Arashi. "An Outage Probability in Cooperative MIMO under (Alamouti, Orthogonal and Quasi Orthogonal STBC) Slow Fading Channel." Wireless Personal Communications 97, no. 4 (November 6, 2017): 5277–87. http://dx.doi.org/10.1007/s11277-017-4778-y.

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33

Barua, Bobby, and S. P. Majumder. "Analytical performance evaluation of a 2 × 2 Alamouti STBC OFDM FSO- communication system over turbulent atmospheric channel." Optik 248 (December 2021): 168124. http://dx.doi.org/10.1016/j.ijleo.2021.168124.

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34

Liu, Tsung-Hsien, Chun-Ning Chiu, Pei-Yu Liu, and Yuan-Sun Chu. "Block-Wise QR-Decomposition for the Layered and Hybrid Alamouti STBC MIMO Systems: Algorithms and Hardware Architectures." IEEE Transactions on Signal Processing 62, no. 18 (September 2014): 4737–47. http://dx.doi.org/10.1109/tsp.2014.2342657.

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35

ShankarPandey, Mahesh, and Bramha Swaroop Tripathi. "A Novel Strategy for Performance Improvement of MISO Wireless System using Alamouti STBC with 4th order FIR Filter." International Journal of Computer Applications 110, no. 16 (January 16, 2015): 9–12. http://dx.doi.org/10.5120/19399-0789.

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36

Shams, Rifat Ara. "Effect of Interleaved FEC Code on Wavelet Based MC-CDMA System with Alamouti STBC in Different Modulation Schemes." International Journal of Computer Science, Engineering and Information Technology 2, no. 1 (February 29, 2012): 235–33. http://dx.doi.org/10.5121/ijcseit.2012.2103.

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37

Sun, Ke, You-xi Tang, and Shi-hai Shao. "On Power Allocation for Alamouti STBC-OFDM Systems with Distributed Transmit Antennas in the Presence of Residual Frequency Offsets." Journal of Electronics & Information Technology 32, no. 12 (January 19, 2011): 2935–41. http://dx.doi.org/10.3724/sp.j.1146.2009.01152.

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38

Koshti, Rahul, and Mayank Kothari. "Performance Analysis of Cognitive Radio based WRAN over Rayleigh Fading Channel with Alamouti-STBC 2X1, 2X2&2X4 Multiplexing." International Journal of Computer Applications 117, no. 15 (May 20, 2015): 48–47. http://dx.doi.org/10.5120/20634-3271.

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39

Coskun, Ahmet Faruk, and Oguz Kucur. "Secrecy Outage Probability of Conventional and Modified TAS/Alamouti-STBC Schemes With Power Allocation in the Presence of Feedback Errors." IEEE Transactions on Vehicular Technology 68, no. 3 (March 2019): 2609–23. http://dx.doi.org/10.1109/tvt.2019.2895017.

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40

Solodovnyk, V. I., and M. I. Naumenko. "SYNTHESIS OF SPECTRALLY AND ENERGY-EFFICIENT SIGNAL-CODE CONSTRUCTIONS FOR MIMO SYSTEMS WITH SIGNALS SPATIAL CODING." Proceedings of the O.S. Popov ОNAT 1, no. 1 (August 27, 2020): 68–81. http://dx.doi.org/10.33243/2518-7139-2020-1-1-68-81.

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Wireless communication systems are considered, the main task of which is to increase their spectral (SE) and energy efficiency (EE) in conditions of limited frequency and energy resources. Additional use of the spatial resource based on flexible and universal methods of signals Space-Time Coding (STC) in MIMO-systems (Multiple Input - Multiple Output) can significantly increase the SE and EE values, as well as significantly improve the capabilities and conditions for EE exchange on SE. The advantages and disadvantages of Orthogonal Space-Time Block Coding (OSTBC) and Non-Orthogonal STBC (NOSTBC) are shown. Two main methods of synthesis of spectrally and energy-efficient information transmission methods are demonstrated. The first method is implemented by creating Perfect-codes that simultaneously achieve maximum diversity and multiplexing gains. The exponential computational decoding complexity of such codes makes it impossible for their practical implementation in mobile terminals at the present stage of development of circuitry. The second method of synthesis is based on improving the simple basic STC methods in terms of increasing the SE and EE by creating Signal-Code Constructions (SCC), which have the advantages of the basic STC methods and are devoid of the disadvantages inherent in Perfect-codes. A technique for the synthesis of SCC is proposed, the essence of which is to determine the priority areas (by the value of the Signal-to-Noise Ratio (SNR)) of using the STC and corresponding signal constellations, which provide the maximum SE for a guaranteed Bit Error Rate (BER). It was found that MIMO 2x2 with Alamouti OSTBC has an advantage in terms of EE over NOSTBC type VBLAST for SE not more than 8 b/s/Hz and SNR under 35 dB, BER not exceeding 10-5. In MIMO 4x4, OSTBC codes are inferior to NOSTBC in terms of EE. VBLAST code allows to provide SE 4 - 8 b/s/Hz at SNR 10 - 20 dB, BER not exceeding 10-5. Based on the results obtained, propositions for further improvement of OSTBC and NOSTBC are formulated.
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41

Lu, Xin, Yun Ting Lu, and Shao Bin Zhan. "Enhanced 2&4 Tx Matrix a Scheme Based on Coordinate Interleaved Orthogonal Designs." Advanced Materials Research 108-111 (May 2010): 398–402. http://dx.doi.org/10.4028/www.scientific.net/amr.108-111.398.

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Space-time block codes(STBCs) based on coordinate interleaved orthogonal designs (CIOD) are put forward integrally by analyzing the theory of generalized orthogonal designs. In accordance with the principle of Alamouti’s orthogonal receiver, the received signals are firstly processed by vector orthogonal transform, imaginary part exchange and vector-weighted spin processing, then we get the complete demodulation process. Finally, simulations for the transmit diversity configuration A with 4Tx CIOD in 802.16d/e were performed over quasi-static Rayleigh flat-fading channel. The results show that the proposed transmission scheme has a low decoding complexity similar to the classical STBC based on complex orthogonal designs(COD). However, the former can get slightly better performance.
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42

Pathania, Monika, and Vinay Bhatia. "BER Analysis of STBC ALAMOUTI’s Code for MIMO System." International Journal of Electronics and Communication Engineering 2, no. 7 (July 25, 2015): 1–6. http://dx.doi.org/10.14445/23488549/ijece-v2i7p101.

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43

Ahmed, Tanvir, Md Shamim Anower, Md Zahurul Islam Sarkar, and Md Mortuza Ali. "Investigation of Correlated Rayleigh Fading Channel with Alamouti’s STBC-MRC system." International Journal of Advanced Science and Technology 58 (September 30, 2013): 65–74. http://dx.doi.org/10.14257/ijast.2013.58.06.

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44

Al-Jarrah, Mohammad A., Nedal K. Al-Ababneh, Mohammad M. Al-Ibrahim, and Rami A. Al-Jarrah. "Cooperative Space Time Coding for Semi Distributed Detection in Wireless Sensor Networks." International Journal of Wireless Networks and Broadband Technologies 2, no. 2 (April 2012): 1–15. http://dx.doi.org/10.4018/ijwnbt.2012040101.

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Parallel distributed detection in wireless sensor networks (WSNs) is considered in this paper. In parallel architecture, sensors process the observations to make local decisions and send them to a central device called fusion center. Parallel architecture is assumed in this paper with cooperative sensors in order to obtain Alamouti space time block codes (STBCs). A similar idea was discussed by Vosoughi and Ahmadi (2009). Although the likelihood ratio provided in that paper is correct, the simulation results don’t make sense. In this paper, we are going to prove that the results provided in (Vosoughi & Ahmadi, 2009) are not correct. Upper bound for the detection performance is also derived. Furthermore, suboptimal fusion rules are derived to support our results. Moreover, correct results are shown in this paper.
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45

Khalid Awaad Humood, ADHAM HADI SALEH, and WA’IL A. H. HADI. "Theoretical Design of Mimo Transceiver and Implementation Its Transmitter Using Fpga." Diyala Journal of Engineering Sciences 7, no. 4 (December 1, 2014): 115–31. http://dx.doi.org/10.24237/djes.2014.07408.

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The use of multiple transmit and receive antennas (MIMO system) is widely accepted in recent years, as a promising technology for future wireless communication, to achieve higher data rates independently of transmission power and bandwidth, with improve system reliability through increasing diversity. This research presents the design and implementation of a multiple antenna wireless communications system using Xilinx Field Programmable Gate Array (FPGA) .The proposed design based on Alamouti’s transmit diversity scheme which is a space-time block code (STBC) with two transmit antennas and an arbitrary number of receive antennas. The implementation demonstrates the space-time code in a baseband system with two antennas for transmitter and receiver. The encoding and decoding algorithms are implemented using VHDL, Spartan 3A /3AN is used to implement transmitter part, where the Virtex2P is used to complete the receiver part design theoretically. Finally the design MIMO systems are implemented successfully.
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46

Lin, Tsui-Tsai, and Fuh-Hsin Hwang. "MCMOE-Based CFO Estimator Aided With the Correlation Matrix Approach for Alamouti's STBC MC-CDMA Downlink Systems." IEEE Transactions on Vehicular Technology 61, no. 8 (October 2012): 3790–95. http://dx.doi.org/10.1109/tvt.2012.2208662.

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47

Ramachandran, Vidhya Lavanya. "Implementation and analysis of MIMO system based on Alamouti coding." Journal of Student Research, July 1, 2019. http://dx.doi.org/10.47611/jsr.vi.548.

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Use of multiple antennas at the receiver and transmitter in a wireless network is a rapidly emerging technology that promises higher data rates at longer ranges without consuming extra bandwidth or transmit power. These systems can be with single-input multiple-output (SIMO), multiple-input single-output (MISO), or with multiple-input multiple-output (MIMO) architectures to improve the signal quality at the receiver using multiple data pipes over a link. MIMO communication system considers multiple antennas used at the transmitting end as well as the receiving end. In addition, the MIMO system has the ability to spread in the spatial domain which is combined in such a way that they either create effective multiple parallel spatial data pipes and diversity to improve the quality (for example decrease the bit error rate). The benefit from the multiple antennas arise from the new dimension space. Hence, the spatial dimension comes as a complement to time. MIMO technology also known as space-time ‘wirelesses’. Space–time block coding (STBC) is a technique used in wireless communications to transmit multiple copies of a data stream across a number of antennas and to exploit the various received versions of the data to improve the reliability of data transfer. The Alamouti coding is a STBC coding technique that is widely use in wireless communication. Alamouti coding can be used in different models like using 2×1 MISO mode or a 2×2 MIMO mode and it can use OFDM system. The purpose of this project is to test a performance of wireless communication system under different type of noise, and the channel model. Also, implementation and analysis of MIMO system based on Alamouti STBC coding.
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48

Wang, Shilian, Fanggang Wang, and Zhao Li. "Space-Time-Coded Adaptive Spatial Modulation in Wireless MIMO Communication Systems." Frequenz 69, no. 7-8 (January 15, 2015). http://dx.doi.org/10.1515/freq-2014-0207.

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AbstractIn this paper, we consider a wireless multi-antenna system using a promising technique, i.e., spatial modulation, and propose an adaptive spatial modulation (ASM) scheme embedded Alamouti space-time block coding (STBC). Instead of selecting one active antenna in each transmission in conventional ASM, we activate two antennas as one antenna group simultaneously to encode the information bits into Alamouti code blocks, each of which needs two channels used. Two detection schemes are presented in different channel conditions, i.e., the maximum likelihood (ML) detection and an adaptive modulation-order selection algorithm. Simulation results show that the proposed scheme improves the error performance and provides larger diversity gain compared to conventional spatial modulation and adaptive spatial modulation.
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Garakyaragh, Nooshin, and Kamal Shahtalebi. "Blind block timing estimation for Alamouti STBC: An adaptive cyclostationary-based approach." ICT Express, February 2022. http://dx.doi.org/10.1016/j.icte.2022.02.009.

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Coşkun, Ahmet Faruk. "Secrecy Outage Probability of Modified TAS/Alamouti-STBC Schemes under Pilot Contamination Attacks." Sakarya University Journal of Science, February 1, 2019, 1. http://dx.doi.org/10.16984/saufenbilder.453314.

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