Encrypted message transmission in a QO-STBC encoded MISO wireless Communication system under implementation of low complexity ML decoding algorithm

In this paper, we made a comprehensive BER simulation study of a quasi- orthogonal space time block encoded (QO-STBC) multiple-input single output(MISO) system. The communication system under investigation has incorporated four digital modulations (QPSK, QAM, 16PSK and 16QAM) over an Additative White Gaussian Noise (AWGN) and Raleigh fading channels for three transmit and one receive antennas. In its FEC channel coding section, three schemes such as Cyclic, Reed-Solomon and Â½-rated convolutionally encoding have been used. Under implementation of merely low complexity ML decoding based channel estimation and RSA cryptographic encoding /decoding algorithms, it is observable from conducted simulation test on encrypted text message transmission that the communication system with QAM digital modulation and Â½-rated convolutionally encoding techniques is highly effective to combat inherent interferences under Raleigh fading and additive white Gaussian noise (AWGN) channels. It is also noticeable from the study that the retrieving performance of the communication system degrades with the lowering of the signal to noise ratio (SNR) and increasing in order of modulation.

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Combined Polar Codes and 2-12 QAM over AWGN and Rayleigh Fading Channels

10.21203/rs.3.rs-137203/v1 ◽

2021 ◽

Author(s):

Flávia Camila Morais Oliveira ◽

Maria de Lourdes Melo Guedes Alcoforado ◽

Garik Markarian ◽

Valdemar Cardoso da Rocha Júnior

Keyword(s):

Fading Channels ◽

Gaussian Noise ◽

Communication System ◽

Rayleigh Fading ◽

Additive White Gaussian Noise ◽

Error Correcting Codes ◽

Rayleigh Fading Channels ◽

Modulation Scheme ◽

Polar Codes ◽

Qam Modulation

Abstract This article investigates a communication system using polar codes combined with a 2-12 QAM modulation scheme over channels disturbed by additive white Gaussian noise (AWGN) as well as over channels disturbed by Rayleigh fading in addition to AWGN. The 2-12 QAM modulation is compatible with legacy 16 QAM still widely used, and when combined with appropriate error correcting codes produces results that approach the Shannon limit.

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Optimal Tracking Performance of MIMO Discrete-Time Systems with Network Parameters

Discrete Dynamics in Nature and Society ◽

10.1155/2016/6826130 ◽

2016 ◽

Vol 2016 ◽

pp. 1-7 ◽

Cited By ~ 1

Author(s):

Chao-Yang Chen ◽

Weihua Gui ◽

Zhi-Hong Guan ◽

Shaowu Zhou ◽

Cailun Huang

Keyword(s):

Fading Channels ◽

Discrete Time ◽

Gaussian Noise ◽

Additive White Gaussian Noise ◽

Steady State Solution ◽

White Gaussian Noise ◽

Algebraic Riccati Equation ◽

Theoretical Development ◽

Space Representation ◽

Network Parameters

The optimal regulation properties of multi-input and multioutput (MIMO) discrete-time networked control systems (NCSs), over additive white Gaussian noise (AWGN) fading channels, based on state space representation, are investigated. The average performance index is introduced. Moreover, the regulation performance is measured by the control energy and the error energy of the system, and fundamental limitations are obtained. Two kinds of network parameters, fading and the additive white Gaussian noise, are considered. The best attainable regulation performance limitations can be obtained by the limiting steady state solution of the corresponding algebraic Riccati equation (ARE). The simulation results are given to demonstrate the main results of the theoretical development.

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Performance Analysis of a WCDMA System Model in a Low Mobility and Indoor Environment with Channel Coding over Additive White Gaussian Noise Channel

International Journal of Engineering Research in Africa ◽

10.4028/www.scientific.net/jera.15.123 ◽

2015 ◽

Vol 15 ◽

pp. 123-133

Author(s):

Filbert O. Ombongi ◽

Philip L. Kibet ◽

Stephen Musyoki

Keyword(s):

Performance Analysis ◽

Gaussian Noise ◽

Channel Coding ◽

Pulse Shaping ◽

Additive White Gaussian Noise ◽

White Gaussian Noise ◽

System Model ◽

Shaping Filter ◽

Coding Scheme ◽

Data Rates

This paper has analyzed the performance a Wireless Division Multiple Access (WCDMA) system model at a data rate of 384kbps and 2Mbps over an Additive White Gaussian Noise (AWGN) channel. The signal was modulated by Quadrature Phase Shift Keying (QPSK) and Quadrature Amplitude Modulation (QAM) with modulation order, M=16. The performance of the system was enhanced by implementing convolution coding scheme. This study was important as it formed a basis through which the performance analysis can be extended to Long Term Evolution (LTE) networks which have data rates starting from 1Mbps to as high as 100Mbps.The performance of the WCDMA at these data rates was seen to improve when convolutional coding scheme was implemented. Since the Shannon capacity formula depends on the BER of a system then this improvement means an additional capacity in the channel and this can accommodate more users in the channel. The results have further shown that the choice of a modulation technique depending on the throughput required affects the BER performance of the system. Therefore, there must be a trade-off between the throughput required, the modulation format to be used and the pulse shaping filter parameters.

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