????????? · The Royal Society of Chemistry’s Journals, Books and Databases (The Royal Society of Chemistry) · 2010
Double Space Time Block Coding(D-STBC) is a combination of Space-time Block coding(STBC) and Vertical-Bell Laboratories Layered space-time coding(V-BLAST). STBC is well known diversity technique in MIMO systems. The STBC can bring much reliability, but lower throughput. In other side, V-BLAST can obtain multiplexing gain for higher throughput, but with less reliability. So the D-STBC is studied widely for obtaining the diversity and multiplexing gain simultaneously. In this paper, performances of various D-STBC algorithms are studied. To performance comparison among the algorithms, we provide various computer simulation results.
Cited by 0
D.M. Terad, Rafael Pedro Torres Jiménez · 2005
This work presents low complexity channel estimators to be used in space-time block codes for orthogonal frequency division multiplexing systems. The proposed estimators, which are frequency based, permit the use of real or complex constellation modulation techniques and allow to send the channel information without interrupting the space-time coding-decoding process, only requiring of linear processing at the receiver. Simulation results show that the proposed estimators achieve considerable gain over existing least square estimators.
Cited by 8
Esra Andio Kaban, Wahyu Pamungkas, Anggun Fitrian Isnawati · 2024
The wireless communication system of the future aims to support high-quality services and data reliability and have speed in data transmission. This study discusses flat fading that occurs in a canal. Flat fading occurs when a radio signal undergoes an even change in a frequency spectrum, this is due to the influence of interference or signal reflection. One of the technologies used to overcome flat fading uses the Multiple Input Multiple Output – Orthogonal Frequency Division Multiplexing (MIMO-OFDM) method which can be integrated with Alamouti’s Space Time Block Code (STBC). The purpose of this study is to improve the performance of the MIMO-OFDM STBC Alamouti communication system in BER. This study simulates the use of Quadrature Phase Shift Keying (QPSK) and Additive White Gaussian Noise (AWGN) modulation in MIMO-OFDM STBC Alamouti communication by comparing no diversity communication and obtaining results in the form of Bit Error Rate and Energy per bit to Noise power spectral density ratio ($\mathbf{E b} / \mathbf{N o}$). This communication comparison shows that MIMO-OFDM STBC Alamouti is better than no diversity. The next validation of the research is the channel coefficient used in MIMO and the number packet used
Cited by 0
Qinghai Yang, Kyung Sup Kwak, Fenglin Fu · 2009
This paper addresses the performance analysis for orthogonal space-time block coded (STBC) multiband orthogonal frequency division multiplexing (MB-OFDM) ultra-wideband (UWB) systems. As the channel model considers the log-normal fading, the resultant signal to noise ratio (SNR) will be the product of a log-normal distributed variable and a variable of sum of several Gamma- distributed variants. Based on this, the exact expressions for the bit error probability and the outage probability are derived theoretically. And their approximate expressions can be obtained via the Gauss-Hermite and the Gauss- Laguerre quadratures, respectively. Simulation results verify the theoretical solutions.
Cited by 2
Nur Wathoni Kholid · 2006
Cited by 0
Qinghai Yang, Kyung Sup Kwak · AEU - International Journal of Electronics and Communications · 2008
Cited by 4
Partha Pratim Bhattacharya · 2012
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Hyoung‐Kyu Song, Min‐Goo Kang, Ou-Seb Lee et al. · Lecture notes in computer science · 2004
Cited by 1
Rodríguez Díaz, Benigno · Americanae (AECID Library) · 2019
Broadband wireless mobile data networks are an extremely important technical topic nowadays. These networks are probably the most convenient alternative for achieving the objective of providing and increasing connectivity and Internet access. For underdeveloped countries, these networks are an excellent alternative to diminish the so-called digital gap. For developed countries, they represent an opportunity to increase services, security and comfort. Broadband wireless networks have been studied, considering their component modules, algorithms and also possibilities of interaction between them. This study was necessary to compare different technical alternatives and earn some knowledge about the related advantages and disadvantages. From this study the dominance of the Orthogonal Frequency Division Multiplexing (OFDM) transmission techniques became clear. It was also clear that multiple antenna (MIMO) systems are needed to guarantee high data rate transmission schemes. The combination between the OFDM transmission technique and multiple antenna MIMO systems is the key focus of this thesis. Robustness and bandwidth efficiency of new differential transmission techniques, improved by the use of diversities, in particular spatial diversity and the related advantages have been studied. Then the attention was focused in these areas, OFDM transmission technique in combination with a subcarrier wise processed differential and spatial diversity technique. Differential modulation schemes have the advantage that any radio channel estimation procedure can be avoided which reduces the computation complexity dramatically. As a result of this work a new class of Differential Space Time Block Codes (DSTBCs) with high performance (lower bit error rate compared to some previously published techniques) has been proposed. The introduced technique is quite flexible and has still some potential for possible improvements (new modulation schemes, new power control mechanisms, etc.). The proposed technique was extensively tested in different radio channel conditions, like AWGN, uncorrelated Rayleigh fading and WSSUS, showing always very good performance and system robustness. When it was tested in WSSUS channels, it was found that the relative improvement (compared with the use of a pure M-PSK modulation technique or another previously published technique) is still increased when the mobile terminal velocity is increased. This suggests that the proposed technique could be particularly attractive for high mobility scenarios. In order to increase the system performance, higher spatial diversity order has been analyzed by using receive diversity. In this case a combining technique for DSTBCs has been proposed, equivalent to Maximum Ratio Combining (MRC) for coherent systems. Observe that the conventional MRC for coherent systems cannot be directly applied to DSTBCs, since an incoherent demodulation is considered, thus there is no direct channel information available at the receiver. Consequently, this new combining technique for DSTBCs has been developed within this work. Finally the performance of the proposed technique in a channel coded system was analyzed, showing that in this case its use is also convenient. In this study also some information about time delay and complexity, associated with the use of convolutional channel coding, was provided, in order to judge the convenience of its use for a particular application.
Cited by 0
Benigno Rodríguez Díaz · 2007
Cited by 3
Abdealrahman Abuqamar, Jehad M. Hamamreh, Mohamedou Abewa · 2021
In this work, OFDM-SPM technique is compounded with Alamouti space-time block coding (STBC) in a multiple-input-single-output (MISO) setup to study, investigate and quantify the wireless systemâs performance of their combination over a wireless multipath Rayleigh fading channel.
Cited by 12Open access
임기홍, 김종만, 권의근 et al. · Open Access System for Information Sharing (Pohang University of Science and Technology) · 2018
Cited by 0
2008
Abstract—In this paper, Optimum adaptive loading algorithms are applied to multicarrier system with Space-Time Block Coding (STBC) scheme associated with space-time processing based on singular-value decomposition (SVD) of the channel matrix over Rayleigh fading channels. SVD method has been employed in MIMO-OFDM system in order to overcome subchannel interference. Chaw’s and Compello’s algorithms have been implemented to obtain a bit and power allocation for each subcarrier assuming instantaneous channel knowledge. The adaptive loaded SVD-STBC scheme is capable of providing both full-rate and full-diversity for any number of transmit antennas. The effectiveness of these techniques has demonstrated through the simulation of an Adaptive loaded SVD-STBC system, and the comparison shown that the proposed algorithms ensure better performance in the case of MIMO.
Cited by 0
Kok Ann Donny Teo, Shûichi Ohno, Keisuke Yamaguchi et al. · 2006
In the downlink of an orthogonal frequency division multiplexing (OFDM) from the base station to the mobile receiver, in order to reduce the receiver decoding; complexity, capture the benefits of a multiple transmit antenna system while at the same time exploit the diversity gain provided by space-time block coding (STBC), we consider transmit antenna selection in an MISO-STBC-OFDM system. To find the optimal pair of antennas in an MISO-STBC-OFDM system, a computational-intensive exhaustive search is usually required. In this paper, we propose an antenna selection method with reduced complexity, based on the norm of the channel impulse responses in the time domain. This proposed antenna selection method exhibits near-optimal bit-rate, bit-error rate (BER) and outage probability performances as substantiated by numerical simulations.
Cited by 2
Nikos Petrellis · 2016
An STBC-OFDM (Space-Time Block Code - Orthogonal Frequency Division Multiplexing) communication system architecture is presented in this paper in which the ADC (Analog/Digital Converter) on the receiver side can operate in lower sampling rate (sub-sampling mode) up to % of the time. In the sub-sampling mode, the ADC and the FFT/IFFT (Fast Fourier Transform - Inverse FFT) require less power and memory and operate faster. The data sparseness and the predictability of parity bit patterns that are generated by sparse data are exploited by some well-known Fourier Transform properties. The efficiency of the proposed system is demonstrated by simulation results based on an STBC-OFDM environment with 2 or 4 transmit antennas, 1024-pt FFT and 16-QAM modulation. An image reconstruction example is also used to visualize the effect of the proposed sub-sampling method.
Cited by 0
임종택, 권의근, 임기홍 · Open Access System for Information Sharing (Pohang University of Science and Technology) · 2018
Cited by 0
F. Sarabchi, Mohammad Kalantari · Zenodo (CERN European Organization for Nuclear Research) · 2008
In this paper, Optimum adaptive loading algorithms are applied to multicarrier system with Space-Time Block Coding (STBC) scheme associated with space-time processing based on singular-value decomposition (SVD) of the channel matrix over Rayleigh fading channels. SVD method has been employed in MIMO-OFDM system in order to overcome subchannel interference. Chaw-s and Compello-s algorithms have been implemented to obtain a bit and power allocation for each subcarrier assuming instantaneous channel knowledge. The adaptive loaded SVD-STBC scheme is capable of providing both full-rate and full-diversity for any number of transmit antennas. The effectiveness of these techniques has demonstrated through the simulation of an Adaptive loaded SVDSTBC system, and the comparison shown that the proposed algorithms ensure better performance in the case of MIMO.
Cited by 3Open access
Yılmaz, Reyat, Özbek, Berna, Özbek, Berna · İYTE (İZMİR YÜKSEK TEKNOLOJİ ENSTİTÜSÜ) · 2005
In this paper, we propose adaptive channel estimation methods based on LMS and RLS for orthogonal STBC-OFDM systems with three transmit antennas. The performance of the proposed algorithms is obtained in the frequency selective channels using Hiperlan/2 characteristics.
Cited by 0Open access
Changping Li, Ying Yi, Kyujin Lee et al. · 2011
In an outdoor environment light emitting diodes-identification (LED-ID) systems, the provision of real-time location information to mobile users has become an active area of research. Visible light communication (VLC) in a LED-ID system offers the promise of a safe, efficient, reliable, and environmentally friendly ID technique. However, there are still several problems associated with such a combination, especially optical multipath dispersion, which has a severe impact on the communication performance. In this paper, we simulated a realistic optical channel in outdoor environment and modeled it as a Rician channel. Based on such a channel model, we further proposed an effective scheme of STBC-OFDM to solve the severe optical multipath dispersion problem and to obtain a target BER of 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-6</sup> at a low SNR, where the received optical signals suffer from deep optical path loss over a long propagation distance. By comparing the BER performances of STBC-OFDM and SISO, our simulation results demonstrated that the STBC-OFDM technique used in a LED-ID system can alleviate the serious effects of multipath dispersion and can tolerate a low SNR for a target BER of 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-6</sup> .
Cited by 6
Pravina Suryavanshi, Dhruv Singh Thakur, Krishnakant Nayak · International Journal of Computer Applications · 2015
) technique is most attractive techniques in wireless communication system and it is very popular for high data rate capacity and against multipath fading. This paper presents performance analysis and a comparative study of OSTBC (Orthogonal Space Time Block Code) over Rayleigh fading channel for MISO (Multiple Input Single Output) defined that the transmitter has multiple antennas at the same time the receiver has one antenna and MIMO (Multiple Input Multiple Output) shows that the both the transmitter and receiver have multiple antennas. In this paper we propose QPSK (Quadrature Phase Shift Key), 16-QAM (Quadrature Amplitude Modulator) schemes and also observe that the performance of PAPR (peak power-to-average ratio), BER (bit error rate) in MIMO and MISO.
Cited by 1Open access