scholarly journals Implementation and analysis of MIMO system based on Alamouti coding

2019 ◽  
Author(s):  
Vidhya Lavanya Ramachandran
Keyword(s):  
Wireless Communication ◽  
Spatial Data ◽  
Communication System ◽  
Channel Model ◽  
Mimo System ◽  
Multiple Antennas ◽  
Space Time ◽  
Alamouti Coding ◽  
Multiple Input ◽  
Input Multiple Output

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.

scholarly journals SCMA-MIMO system with adaptation to the channel state

2021 ◽  
Vol 2134 (1) ◽  
pp. 012025
Author(s):  
Dmitriy Pokamestov ◽  
Yakov Kryukov ◽  
Eugeniy Rogozhnikov ◽  
Islam Kanatbekuli ◽  
Edgar Dmitriyev
Keyword(s):  
Communication System ◽  
Orthogonal Frequency Division Multiplexing ◽  
Multiple Access ◽  
Mimo System ◽  
Multiple Input Multiple Output ◽  
Network Resources ◽  
Multiple Input ◽  
The Matrix ◽  
High Spectral Efficiency ◽  
Input Multiple Output

Abstract Sparse code multiple access (SCMA) is one of the promising implementations of non-orthogonal multiple access (NOMA) methods. SCMA provides high spectral efficiency and a large number of network resources. We describe a communication system with SCMA, space-time block coding (STBC), multiple input multiple output (MIMO) technology, and orthogonal frequency division multiplexing (OFDM). The architecture of such systems, including algorithms of formation and processing of signals is considered. A method for adapting signals to the state of the spatial channel transmission based on information about the matrix of channel coefficients is proposed. The application of such adaptation allows to compensate the influence of the channel and to reduce the probability of bit errors. We consider the bit error rate (BER) performance of the communication system in different channel models and show the effectiveness of the proposed methods.

scholarly journals Massive MIMO and Hybrid Optimization for It's Beamforming

2019 ◽  
Vol 8 (3) ◽  
pp. 7692-7698
Keyword(s):  
Wireless Communication ◽  
High Throughput ◽  
Communication System ◽  
High Speed ◽  
Multiple Input Multiple Output ◽  
Research Work ◽  
Network Capacity ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Mimo Technology

The tremendous growth of traffic in wireless communication (WC) system has resulted in inadequate network capacity. 5th Generation (5G) is seen as next generation wireless communication system implemented with massive multiple-input multiple-output (M-MIMO) technology. It will play major role in future communication system. M-MIMO objective is high throughput and high speed. Beamforming technique is a key to high throughput objective - achieved by reduction in errors occurring in data transmission and reception. The intent of this research paper is to review - beam forming techniques implemented in M-MIMO and research work in this particular area. Paper classifies optimized beamforming techniques in detail for determining appropriate techniques that can be deployed in M-MIMO. Understanding limitations of present techniques and suggesting new approach for better throughput is outcome of retrospective analysis.

Effect of Antenna Layout on the Capacity of Massive MIMO

2014 ◽  
Vol 716-717 ◽  
pp. 1194-1198
Author(s):  
Xiao Yu Li ◽  
Xiao Fei Zhang ◽  
Da Zhuan Xu ◽  
Qui Ming Zhu
Keyword(s):  
Channel Model ◽  
Narrow Band ◽  
Mimo System ◽  
Multiple Input Multiple Output ◽  
System Capacity ◽  
Antenna Aperture ◽  
Multiple Input ◽  
Flat Fading ◽  
Input Multiple Output ◽  
Capacity Performance

This paper addresses the problem of the effect of different antenna layouts on the capacity of massive multiple-input multiple-output (MIMO) system capacity. Based on the narrow-band, flat fading channel model, the effect of scattering environment and antenna layout are considered by incorporating the power azimuth spectrum (PAS) and the array manifold vector. Under the same antenna aperture, six antenna layouts are investigated among which the UCA yields the best capacity while ULA yields the lowest capacity. The more symmetric the antenna geometry is, the better capacity performance it has.

scholarly journals Turbo-Space Time Block Coded and Turbo-Vertical Bell Laboratories Layered Space Time coded Wireless Communication: Which One is better to Use and under What Circumstances?

2019 ◽  
Vol 8 (2) ◽  
pp. 3912-3919
Keyword(s):  
Wireless Communication ◽  
Research Performance ◽  
Multiple Input Multiple Output ◽  
Block Code ◽  
Space Time ◽  
Time Block ◽  
Low Snr ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Turbo Encoder

In this research, performance of Turbo-Space Time Block Coded and Turbo-Vertical Bell Laboratories Layered Space Time coded Multiple Input Multiple Output Wireless Communication System is compared and investigated to find which one is better under which circumstances. The Turbo Encoder accepts binary bits as input and generates turbo encoded bits as output which is sent to 64 QAM modulator. These 64 QAM Modulated symbols are further mapped using Space Time Block Code and Vertical Bell Laboratories Layered Space Time code for Turbo-Space Time Block Coded system and Turbo-Vertical Bell Laboratories Layered Space Time coded system respectively and then divided into several streams based on number of transmit antennas before transmission. It is found that there is 3 to 22 dB coding gain at 10-5 for using Turbo-STBC instead of using Turbo-VBLAST for 2 or 3 or 4 transmit antennas and 2 or 3 or 4 or 5 or 6 receive antennas. On the other hand, at low SNR STBC shows 1-2 b/s/Hz improvement in capacity compare to VBLAST but capacity declines significantly at high SNR for using STBC. It is also observed that VBLAST improves the capacity around 5 to 15 b/s/Hz at high SNR.

scholarly journals On the performance of code word diversity based quasi orthogonal space time block codes in multiple-input-multiple-output systems

2020 ◽  
Vol 10 (3) ◽  
pp. 2535
Author(s):  
SenthilKumar Kumaraswamy ◽  
Palanivelan Manickavel ◽  
Noormohammed Valimohamad ◽  
Helanvidhya Thankaraj ◽  
Yogalakshmi Venkatesan ◽  
...  
Keyword(s):  
Mimo System ◽  
Multiple Input Multiple Output ◽  
Block Codes ◽  
Space Time ◽  
Code Word ◽  
Time Block ◽  
Probability Of Error ◽  
Orthogonal Space ◽  
Multiple Input ◽  
Input Multiple Output

In the recent past, a lot of researches have been put into designing a Multiple-Input-Multiple-Output (MIMO) system to provide multimedia services with higher quality and at higher data rate. On par with these requirements, a novel Quasi Orthogonal Space Time Block Code (QOSTBC) scheme based on code word diversity is proposed, which is a multi-dimensional approach, in this paper. The term code word diversity is coined, since the information symbols were spread across many code words in addition to traditional time and spatial spreading, without increasing transmission power and bandwidth. The receiver with perfect channel state information estimates the transmitted symbols with less probability of error, as more number of samples is available to estimate given number of symbols due to the extra diversity due to code words. The simulation results show a significant improvement in the Bit Error Rate (BER) performance of the proposed scheme when compared with the conventional schemes.

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