scholarly journals Performance of Convolution and CRC Channel Encoded V-Blast 4x4 MIMO MC-CDMA Wireless Communication System

2021 ◽  
Vol 9 (2) ◽  
pp. 1-6
Author(s):  
Md. Firoz Ahmed ◽  
Md. Tahidul Islam ◽  
Abu Zafor Md. Touhidul Islam
Keyword(s):  
Wireless Communication ◽  
Communication System ◽  
Signal To Noise Ratio ◽  
Minimum Mean Square Error ◽  
Signal Transmission ◽  
Audio Signal ◽  
Wireless System ◽  
Digital Modulation ◽  
Wireless Communication System ◽  
Encoding Strategies

Wireless communications are among the rapidly growing fields in our current life and have a massive effect on every aspect of our everyday life. In this paper, the performance of the various digital modulation techniques (BPSK, DPSK, QPSK, and QAM) based wireless communication system on the audio signal transmission through the additive Gaussian Noise (AWGN) channel is assessed on the basis of bit error rate (BER) as a function of the signal-to-noise ratio (SNR). Based on the results of this study, BPSK modulation outperforms the DPSK, QPSK, and QAM modulation strategies in the MIMO MC-CDMA VBlast based wireless communication system. The digital modulation of QPSK shows the worst performance in audio signal transmission especially in comparison to other digital modulations. It is clear from the current simulation study based on MATLAB that the V-Blast encoded 4×4 MIMO MC-CDMA wireless system with minimum mean square error (MMSE) signal detection and 1⁄2-rated convolution and cyclic redundancy check (CRC) channel encoding strategies show good performance utilizing BPSK digital modulation in audio signal transmission.

Evaluation of inter-aircraft optical wireless communication system with different modulation formats

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Saumya Srivastava ◽  
Kamal Kishor Upadhyay ◽  
Narendra Kumar Shukla
Keyword(s):  
Wireless Communication ◽  
Communication System ◽  
Signal To Noise Ratio ◽  
Optical Wireless Communication ◽  
Optical Wireless ◽  
Detection Mechanism ◽  
Modulation Formats ◽  
Pointing Error ◽  
Wireless Communication System ◽  
System A

Abstract In this paper, simulative evaluation of the inter-aircraft optical wireless communication system with the use of different modulation formats like return to zero (RZ), non return to zero (NRZ) and raised cosine by signal to noise ratio (SNR) and quality factor (Q-factor). Performance parameters are attenuation level, transmitting pointing error and scintillation are used to analyse the performance of the system. Including the pre- and post-amplifier configuration in the system, a link range of 100 km is achieved at an acceptable bit error rate and the performance of the system is also enhanced at a 5 Gbps data rate as compared to the earlier detection mechanism.

scholarly journals Cooperative beamforming for a double-IRS-assisted wireless communication system

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Guodong Tian ◽  
Rongfang Song
Keyword(s):  
Wireless Communication ◽  
Communication System ◽  
Communication Systems ◽  
Signal To Noise Ratio ◽  
Pso Algorithm ◽  
Base Station ◽  
Wireless Communication Systems ◽  
Wireless Communication System ◽  
Power Simulation ◽  
Reflecting Surface

AbstractIntelligent reflecting surface (IRS) has emerged as an innovative and disruptive solution to boost the spectral and energy efficiency and enlarge the coverage of wireless communication systems. However, the existing literature on IRS mainly concentrates on wireless communication systems assisted by single or multiple distributed IRSs, which are not always effective. In view of this issue, this paper considers a special double-IRS-assisted wireless communication system, where IRS1 and IRS2 are deployed near the base station (BS) and the user, respectively, and the transmitted signals reach the user via the cascaded BS-IRS1-IRS2-user channel only. We cooperatively optimize transmit and passive beamforming on the two IRSs based on the particle swarm optimization (PSO) algorithm to maximize the received signal power. Simulation indicates that despite no direct line-of-sight (LoS) path from the BS to the user, an excellent signal-to-noise ratio (SNR) is available at the receiver with the aid of two IRSs, which demonstrates that it is feasible to assist communication by double reflection links composed of two IRSs. Additionally, we unexpectedly find that when the positions of the two IRSs are fixed, by exchanging the positions of the BS and the user, the obtainable SNRs are similar.

Designing Multisine Excitations for Measurement of Modern Wireless Communication System

2011 ◽  
Vol 103 ◽  
pp. 25-29
Author(s):  
Xiao Yan Yuan ◽  
Hong Fang ◽  
Xin Zhou ◽  
Guo Chu Shou
Keyword(s):  
Wireless Communication ◽  
Communication System ◽  
Fourier Transformation ◽  
Discrete Fourier Transformation ◽  
Original Signal ◽  
Digital Modulation ◽  
Reverse Link ◽  
Wireless Communication System ◽  
Rf Signals

Multisine signal is often employed as an appropriate excitation to represent the complex modulated RF signals for accurate measurement of modern wireless communication system. This paper presents a novel way of designing a multisine signal by using Discrete Fourier Transformation coefficients to represent the digital modulation signals. Investigations of the approach on the IS-95 reverse-link signal as original signal is demonstrated the designed multisine signal can approximate represent original signal.

scholarly journals Performance Evaluation of Mimo System with Massive Antenna Arrays

2019 ◽  
Vol 8 (10) ◽  
pp. 981-984
Keyword(s):  
Wireless Communication ◽  
Fading Channels ◽  
Antenna Arrays ◽  
Communication System ◽  
Mimo System ◽  
Signal To Noise Ratio ◽  
Phase Error ◽  
High Standard ◽  
Limited Bandwidth ◽  
Wireless Communication System

In the ground of digital word, wireless communication system has widespread functions. The demand for wireless communication is growing day by day. All users want better quality service in scope of wireless communication. Due to high bit error rate (BER), low signal to noise ratio (SNR), limited bandwidth and high standard deviation (SD) of phase error conventional wireless communiqué systems like SISO, SIMO and MISO flops to gather the mounting demand of users. Therefore a new technique MIMO system is realized whose performance is evaluated by parameters BER, SNR and SD of Phase Error. Latest approach for increasing the performance of virtual MIMO communications within peers by ill-treatment situation with giant antenna arrays is developed. MIMO provides low BER and low SD of Phase Error with increased SNR, which forms a good feature for wireless communication system. In this paper, performance of MIMO is assessed under Nakagami-m and Rayleigh fading channels. For a wireless system BER and SD of phase error should be minimum, which is achieved in MIMO system.

Design and Implementation of Key Technologies of Carrier Synchronization in Wireless Communication System

2014 ◽  
Vol 602-605 ◽  
pp. 3329-3332
Author(s):  
Guo Qing Dang ◽  
Xiao Yan Cheng
Keyword(s):  
Wireless Communication ◽  
Communication System ◽  
Signal To Noise Ratio ◽  
Low Complexity ◽  
Carrier Synchronization ◽  
Signal To Noise ◽  
Wireless Communication System ◽  
Low Snr ◽  
Noise Ratio ◽  
The One

Noise multiple and user interference are the two important influencing factors that carrier synchronization technology in the wireless communication system faces. On the one hand, the phase locked loop and data aided carrier synchronization device is faced with poor estimation precision and slow convergence speed. On the other hand frequency offset and channel estimation problem need to be solved in multi-input multi-output (MIMO) communication system collaboration under the condition of dry low signal to noise ratio. So research of carrier synchronization algorithm of low complexity, high precision in view of the low SNR and multi-user communication system is becoming an important issue. 1. Carrier synchronization technology in wireless communication system of low signal-to-noise ratio and multiuser

Modification in Parameters and Improved Analysis of Intersatellite Optical Wireless Communication System

2016 ◽  
Vol 5 (3) ◽  
pp. 7
Author(s):  
SHARMA POOJA ◽  
SHRIVASTAVA SHARAD MOHAN ◽  
MISHRA ANUJA ◽  
AGRAWAL PRACHI ◽  
PARGANIHA RAHUL ◽  
...  
Keyword(s):  
Wireless Communication ◽  
Communication System ◽  
Optical Wireless Communication ◽  
Optical Wireless ◽  
Wireless Communication System
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