scholarly journals Image Transmission in 4G LTE using DWT based SC-FDMA System

2018 ◽  
Vol 11 (3) ◽  
pp. 1633-1642
Author(s):  
Padmapriya V. M.
Keyword(s):  
Wireless Communication ◽  
Communication Systems ◽  
Multiple Access ◽  
Image Transmission ◽  
Performance Measure ◽  
Error Rates ◽  
Superior Performance ◽  
Frequency Division ◽  
Single Carrier ◽  
4G Lte

In recent trends, the image transmission over wireless communication system in 4G LTE (Long Term Evolution) grow into a challenging task. OFDMA (Orthogonal Frequency Division Multiple Access) plays a key role in data transmission (text, image and video) over wireless systems. In OFDMA several transformation techniques have been used for the transmission of images. But they have some drawbacks such as increased number of carriers, increased delay estimation, high ISI and ICI. Hence, to overcome these drawbacks, an image transmission over wireless communication is proposed using DWT technique. OFDMA has several benefits like less complexity, high flexibility and high spectral efficiency. However, still, it lacks in noise reduction and increased error rates. To avoid these issues, SC-FDMA (Single Carrier Frequency Division Multiple Access) techniques is introduced in this work for the image transmission over wireless communication systems. In this proposed work, a DWT based SC-FDMA system is implemented to reduce the noise and interference using wavelet transform analysis. The performance measure of SNR, PSNR, BER and MSE for the proposed DWT based SC-FDMA system is evaluated using MATLAB. The results indicate that the proposed technique affords superior performance with a reduced BER.

scholarly journals PAPR Analysis of Fifth Generation Multiple Access Waveforms for Advanced Wireless Communication

2018 ◽  
Vol 7 (3.34) ◽  
pp. 487 ◽  
Author(s):  
Kommabatla Mahender ◽  
Tipparti Anil Kumar ◽  
K S Ramesh
Keyword(s):  
Wireless Communication ◽  
Communication Systems ◽  
Orthogonal Frequency Division Multiplexing ◽  
Multiple Access ◽  
Average Power ◽  
Cumulative Distribution ◽  
Fourth Generation ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Single Carrier

This paper describes the aspects of multiple access for emerging (5G) Wireless Communication Systems. Orthogonal Frequency Division Multiplexing (OFDM) is best suited for fourth generation (4G) but it suffers from the problem of high Peak to Average Power Ratio (PAPR) & Side band leakage. Single carrier frequency division multiple access (SC-FDMA) has worked like an alternative to OFDMA only in the uplink process and PAPR was reduced. OFDM based 4G network is not capable of supporting diverse applications and these applications can be implemented by 5G.  High traffic requirements of 5G can be evaluated by using multiple access schemes, namely filter-bank multi-carrier (FBMC), universal-filtered multi-carrier (UFMC), generalized frequency-division multiplexing (GFDM). Comparison of PAPR reduction is done based on Complementary Cumulative Distribution Function (CCDF), for various multiple access 5G waveforms.  

scholarly journals Performance comparative study of single and multi-carrier CDMA-based wireless communication systems

2021 ◽  
Author(s):  
Guangjian Feng
Keyword(s):  
Wireless Communication ◽  
Communication Systems ◽  
Multiple Access ◽  
Wide Band ◽  
Wireless Communication Systems ◽  
Access System ◽  
Single Carrier ◽  
Single Block ◽  
User Interference ◽  
Multiple Access System

This project presents the system performance on three self-developed system models: single-carrier wide-band CDMA, multi-carrier DS SS CDMA and hybrid CDMA / OFDM. These three models are developed from a basic Matlab-based wireless communication system model and have been put into hundreds of experimental simulations to rectify the functions of every single block. In the goal to evaluate the performance of a modern multiple access system, series of simulations that are carefully planned and adjusted are carried out. Characteristics such as spectrum, orthoganality, number of chips, multi-user interference and guard band are covered throughout the simulations. Simulation results are translated into mathematical plots and analyzed. Finally, the project is summarized and some conclusions are drawn as well.

scholarly journals Performance comparative study of single and multi-carrier CDMA-based wireless communication systems

2021 ◽  
Author(s):  
Guangjian Feng
Keyword(s):  
Wireless Communication ◽  
Communication Systems ◽  
Multiple Access ◽  
Wide Band ◽  
Wireless Communication Systems ◽  
Access System ◽  
Single Carrier ◽  
Single Block ◽  
User Interference ◽  
Multiple Access System

This project presents the system performance on three self-developed system models: single-carrier wide-band CDMA, multi-carrier DS SS CDMA and hybrid CDMA / OFDM. These three models are developed from a basic Matlab-based wireless communication system model and have been put into hundreds of experimental simulations to rectify the functions of every single block. In the goal to evaluate the performance of a modern multiple access system, series of simulations that are carefully planned and adjusted are carried out. Characteristics such as spectrum, orthoganality, number of chips, multi-user interference and guard band are covered throughout the simulations. Simulation results are translated into mathematical plots and analyzed. Finally, the project is summarized and some conclusions are drawn as well.

scholarly journals A six-channel microstrip diplexer for multi-service wireless communication systems

2020 ◽  
Vol 41 (3) ◽  
Author(s):  
Farhad Fouladi ◽  
Abbas Rezaei
Keyword(s):  
Wireless Communication ◽  
Communication Systems ◽  
The Other ◽  
Wireless Communication Systems ◽  
Frequency Division ◽  
Compact Size ◽  
Coupled Lines ◽  
Simulation Results ◽  
Insertion Losses

In this paper, a six-channel microstrip diplexer is designed and fabricated. It operates at 0.75/0.85/1/1.25/1.6/1.8 GHz for multi-service wireless communication systems. It consists of two stub-loaded resonators, which are integrated by coupled lines. The channels are close together, which makes the proposed diplexer suitable for frequency division duplex (FDD) schemes. The proposed structure has a compact size of 0.025 λg2 where λg is the guided wavelength calculated at 0.75 GHz. The other advantages of the introduced multi-channel diplexer are the low insertion losses of 1.62/1.27/0.43/0.53/1.26 and 1 dB, as well as good return losses of 26/26/25/25/21.7 and 22 dB at 0.75/0.85/1/1.25/1.6/1.8 GHz respectively. A good isolation of less than 22 dB is obtained between the channels. In order to design the presented diplexer a designing technique is used which is based on the proposing of an equivalent approximated LC model and calculating the inductors and capacitors. To confirm the simulation results, the introduced diplexer is fabricated and measured.

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