scholarly journals Investigation of error performance in network coded MIMO-VBLAST wireless communication systems

2019 ◽  
Vol 70 (4) ◽  
pp. 273-284
Author(s):  
Ali Farzamnia ◽  
Ngu War Hlaing ◽  
Lillian Eda Kong ◽  
Manas Kumar Haldar ◽  
Tohid Yousefi Rezaii
Keyword(s):  
Phase Shift ◽  
Wireless Communication ◽  
Bit Error Rate ◽  
Error Rate ◽  
Communication Systems ◽  
Mimo System ◽  
Minimum Mean Square Error ◽  
Multipath Fading ◽  
Phase Shift Keying ◽  
Shift Keying

Abstract Paper aims to enhance the performance of bit error rate (BER) in wireless communication based on the multiple-input multiple-output (MIMO) system of vertical Bell laboratories layered space-time (VBLAST) algorithm. The VBLAST algorithm uses zero-forcing (ZF) and the minimum mean square error (MMSE) to evaluate the BER of wireless communication. MIMO VBLAST techniques function as an adaptive filter and can minimize the interference and multipath fading in the received signal of the channel. Physical layer network coding (PNC) is a new technique used to exploit the spatial diversity of the MIMO VBLAST system to improve the throughput and performance of wireless communication. The bit-error-rate (BER) of proposed VBLAST MIMO with PNC with binary phase-shift keying (BPSK) and quadrature phase-shift keying (QPSK) modulation over the additive white Gaussian noise and Rayleigh fading channel are analyzed. The performance of both BPSK and QPSK modulation in two and four antennas are compared. From the simulation results, it was found that the proposed scheme MIMO VBLAST PNC has a 45.2 % higher BER performance compared to the traditional MIMO scheme with an increase in the BER using MMSE and ZF respectively in both two and four antennas.

scholarly journals Bit Error Rate Analysis of Different Modulation Schemes in Free Space Optics Link using Gamma-Gamma Turbulence Model

2019 ◽  
Vol 8 (4) ◽  
pp. 8292-8295
Keyword(s):  
Phase Shift ◽  
Gamma Distribution ◽  
Bit Error Rate ◽  
Error Rate ◽  
Free Space ◽  
Channel Model ◽  
Distribution Model ◽  
Phase Shift Keying ◽  
Free Space Optical ◽  
Shift Keying

Free Space Optical (FSO) link using gamma-gamma channel model has been studied in this paper. Comparison of the probability density function of gamma-gamma distribution under weak and strong turbulence regime has been performed. Performance of Bit error rate (BER) using different subcarrier-intensity modulation (SIM) schemes such as binary phase shift keying (BPSK), M-ary phase shift keying (M-PSK) and quadrature amplitude modulation (QAM) have been also investigated. Using MATLAB software, the BER is plotted with respect to normalized signal to noise ratio (SNR) and the link distance. All the analysis has been done using the Gamma-Gamma distribution model. In this work we found that the effectiveness of each modulation technique depends on the environment.

scholarly journals Performance Evaluation of Log-normal And Negative Exponential Channel Modeling Using Various Modulation Techniques in OFDM-FSO Communication

2005 ◽  
Vol 4 (2) ◽  
pp. 639-647
Author(s):  
Nitin Shankar Singh ◽  
Gurpartap Singh
Keyword(s):  
Phase Shift ◽  
Bit Error Rate ◽  
Error Rate ◽  
Free Space ◽  
Free Space Optics ◽  
Phase Shift Keying ◽  
Space Optics ◽  
Modulation Techniques ◽  
Shift Keying ◽  
Negative Exponential

Free Space Optics (FSO) is one of the emerging technology which is thoroughly being popular and is basically using optical signals for the communication. The paper evaluates the bit error rate performance of the Free space Optics (FSO) system. To design a high performance communication link for the atmospheric FSO channel, it is of great importance to characterize the channel with proper model. The performance of the highly efficient, high data rate system is limited by the certain constraints like scintillation effects and atmospheric turbulence. The FSO communication system using Orthogonal Frequency Division Multiplexing (OFDM) technique which is known for its increased robustness against frequency selective fading, narrow-band interference and high channel efficiency. The performance of the modulation techniques- Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK) and 8-PSK are studied in the Lognormal and Negative Exponential channel. The obtained results are the comparative study of Bit Error Rate (BER) vs. Signal to Noise Ratio (SNR), which is quite useful for analyse the system performance with different channel models for various modulation techniques.

Study on the Performance of DBPSK Communication System

2013 ◽  
Vol 427-429 ◽  
pp. 1241-1245
Author(s):  
Hong Gang He ◽  
Hai Yang Fu
Keyword(s):  
Probability Theory ◽  
Phase Shift ◽  
Bit Error Rate ◽  
Error Rate ◽  
Communication System ◽  
Simulation Method ◽  
Phase Shift Keying ◽  
Shift Keying ◽  
Binary Phase Shift Keying ◽  
Ber Performance

Focused on the communication system of differentially encoded binary phase-shift keying (DBPSK/2DPSK), this paper studies on the influences of inter symbol interferences (ISI) on the bit error rate (BER) performance and derives the BER expression that is applicable for arbitrary sending probabilities of binary symbols using the knowledge of integration and probability theory, which is then demonstrated to be correct by the Monte Caro simulation method.

scholarly journals EFFICIENT ANALYSIS OF MIMO-OFDM SYSTEM IN NAKAGAMI-m FADING CHANNEL

2016 ◽  
Vol 54 (6) ◽  
pp. 698
Author(s):  
Ho Van Cuu ◽  
Hoang Hiep Le ◽  
Nguyen Thi Thu-Hang
Keyword(s):  
Phase Shift ◽  
Fading Channels ◽  
Error Rate ◽  
Fading Channel ◽  
Orthogonal Frequency Division Multiplexing ◽  
Multipath Fading ◽  
Phase Shift Keying ◽  
Ofdm System ◽  
Shift Keying ◽  
Mimo Ofdm

Bit error rate (BER) and symbol error rate (SER) performance response fading parameter for multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system over Nakagami-m fading channel would be provided in this study. Some channel simulations and evaluations were for 2×2 MIMO-OFDM system in which data are sent from two transmit antennas to two receive antennas. In this study, authors have used binary phase-shift keying (BPSK) and quadrature phase-shift keying (QPSK) modulation techniques to modulate the data stream. In addition, numerical results have been presented and compared for several different environmental propagations such as Nakagami-m, Rician, Rayleigh multipath fading channels, and non-fading additive white Gaussian noise (AWGN) channel. Based on such obtained presentation and comparison, the paper would discuss further about relation between value of paramater m and quality of system.

scholarly journals ANALISIS INTERCARRIER INTERFERENCE (ICI) PADA OFDM-MIMO BERDASARKAN M-ARY PHASE SHIFT KEYING (M-PSK)

2019 ◽  
Vol 6 (1) ◽  
pp. 81
Author(s):  
Ni Made Arny Megasari ◽  
I GAK Diafari Djuni ◽  
Ni Made Ary Esta Dewi
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Multipath Fading ◽  
Frequency Offset ◽  
Intercarrier Interference ◽  
Phase Shift Keying ◽  
Mobile Channel ◽  
Narrow Bandwidth ◽  
Shift Keying ◽  
Offset Frequency

One of the techniques that are used to define the multipath fading it can make is Ortoghonal Frequency Division Multiplexing (OFDM). System on multicarrier technique is one that has a frequency of orthogonal to each other by using a narrow bandwidth. The weakness of the system on which occurred in mobile channel due to the technique of the time on a channel so that orthogonalitas on a subchannel would pose intercarrier interference and missing (ICI). This research aims to analyze the intercarrier interference (ICI) on the system on MIMO using BPSK and QPSK modulation in fading channel. In terms of values and graph of Bit Error Rate (BER) is proportional to the energy per Bit to noise (Eb/no). This research also aims to find out the influence of frequency on the system on-MIMO offset. The results of the comparison of the system of on-frequency offset value with MIMO that applies fruit 2, 4 and 6 kHz, a frequency of 2 kHz offset produces the most good. On the calculation of the 5 Eb N0 BPSK modulation with dB on the value of the offset frequency of 2 kHz getting the value of the Bit Error Rate 0.0037, for the value of the frequency offset 4 kHz in modulation BPSK BER 0.0058 and get value for value frequency offset of 6 kHz on modulation BPSK get the value of the BER of 0.0114.

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