Spectral efficient modulation schemes in a SFH-TDMA orthogonal frequency division multiplexing (OFDM) wireless communication system to support advanced services

2002 ◽  
Author(s):  
R. Bohnke ◽  
M. Suzuki ◽  
K. Sakoda
Keyword(s):  
Wireless Communication ◽  
Communication System ◽  
Orthogonal Frequency Division Multiplexing ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Wireless Communication System ◽  
Modulation Schemes

scholarly journals Enhancing Performance of Orthogonal Frequency Division Multiplexing (OFDM) Based On Fast Fourier Transform (FFT) In Wireless Communication System

2019 ◽  
Vol 8 (3) ◽  
pp. 2003-2008
Keyword(s):  
Fourier Transform ◽  
Wireless Communication ◽  
Fast Fourier Transform ◽  
Communication System ◽  
Orthogonal Frequency Division Multiplexing ◽  
Modulation Method ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Multicarrier Transmission ◽  
Wireless Communication System

Orthogonal Frequency Division Multiplexing (OFDM) is one of the multicarrier transmission techniques used in wireless communication system. It has many benefits such as robust in channel fading and has high spectral density. The main objective of OFDM implementation in wireless communication system is to achieve less or zero Bit Error Rate (BER). However, OFDM design complexity, requirement and selection of the suitable modulation method are among the current issues. Thus, this paper aims to investigate the performance of OFDM in wireless communication by developing two OFDM based system designs. The transmitter, channel and receiver are designed based on OFDM system principles. Forward Error Correction (FEC) method is applied to reduce the BER. Both OFDM designs produce less BER with zero BER for the second OFDM design. The investigation study shows that the performance of OFDM can be enhanced by applying Fast Fourier Transform (FFT) technique. Zero BER can be achieved if the suitable modulation scheme is applied in the system. The developed designs are not complex, suitable to be applied for IEEE 802.11 standard. The BER performance can be influenced by the types of channels, signal to noise ratio (SNR) and various modulation schemes. Thus, this study can be used as a guidance to implement the OFDM in the current or future wireless communication system.

scholarly journals Design and implementation of low power encoder incorporating adaptive modulation for multi user OFDM system

2018 ◽  
Vol 7 (1.9) ◽  
pp. 41
Author(s):  
K Jayaram ◽  
Dr C.Arun
Keyword(s):  
Wireless Communication ◽  
Low Power ◽  
Communication System ◽  
Orthogonal Frequency Division Multiplexing ◽  
Adaptive Modulation ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Ofdm System ◽  
Wireless Communication System ◽  
Design And Implementation

Wireless communication system is a key element in modern uninterupted data tramsnission and reception services. In this paper, multi user Orthogonal Frequency Division Multiplexing (OFDM) system is designed with low power encoder and adaptive modualtion architectures. The proposed multi user encoder architecture is designed in Verlog HDL and simulated in Modelsim simulator. Xilinx Project Navigator is used to evaluate the performance of the proposed architecture interms of power consumptions and hardware utilizations by implementing the architecture on different virtex processors.

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