scholarly journals OFDM: From the Idea to Implementation

2005 ◽  
Vol 3 ◽  
pp. 27-37 ◽  
Author(s):  
S. A. Fechtel
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Digital Communication ◽  
Multipath Propagation ◽  
Communication Technologies ◽  
Frequency Division Multiplexing ◽  
Frequency Division

Abstract. OFDM (orthogonal frequency-division multiplexing) is one of the key digital communication technologies of the current decade. The first part of this paper presents the fundamentals of OFDM and its benefits in the presence of multipath propagation in a tutorial-like fashion. The second part details on some of the most important aspects of OFDM transceiver implementation: concept of receiver channel filtering and A/D conversion, radio impairment compensation (I/Q mismatch), and OFDM demodulator (FFT) design.

scholarly journals A REVIEW STUDY ON ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING

2021 ◽  
pp. 1-3
Author(s):  
Vishal Ghode ◽  
Suresh Gawande ◽  
Satyarth Tiwari
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Digital Communication ◽  
Research Paper ◽  
Frequency Division Multiplexing ◽  
Network Architectures ◽  
Frequency Division ◽  
Data Accessibility ◽  
The Past ◽  
Previous Design ◽  
Review Study

The advancement in the up-grading of technology and proliferation in data accessibility is changing the economics of digital communication; therefore, this enables the reexamining of the previous design and approach to network architectures. This research paper focused on advancements in technology in the past few years and concentrate on OFDM (Orthogonal Frequency Division Multiplexing).

Peak-to-Average Power Ratio Reduction for Acoustic Orthogonal Frequency Division Multiplexing Systems

2010 ◽  
Vol 44 (4) ◽  
pp. 30-41 ◽  
Author(s):  
Guillem Rojo ◽  
Milica Stojanovic
Keyword(s):  
Communication Systems ◽  
Orthogonal Frequency Division Multiplexing ◽  
Multipath Propagation ◽  
Average Power ◽  
Gradient Algorithm ◽  
High Rate ◽  
Modulation Scheme ◽  
Frequency Division Multiplexing ◽  
Power Ratio ◽  
Frequency Division

AbstractOrthogonal frequency division multiplexing (OFDM) is an appealing modulation scheme for high-rate underwater acoustic communications that are challenged by multipath propagation. However, it has a drawback in the large peak-to-average power ratio (PAR). Techniques for PAR reduction have been extensively studied for radio communication systems. Although these techniques are applicable to acoustic systems, we take a different approach that aims to capitalize on the fundamental differences between the acoustic and the radio systems; namely, the fact that acoustic transmissions are inherently band limited. We extend the tone reservation technique to the out-of-band carriers and design efficient methods for constructing OFDM signals with lower PAR. Two approaches are investigated, one based on a gradient algorithm and another that uses random sequences. Simulation results show that our techniques can provide PAR reduction without the loss in data rate.

scholarly journals Reduction of Phase-Modulation to Intensity-Modulation Conversion Noise Effect Using Delayed Self-Homodyne Optical Orthogonal Frequency Division Multiplexing System

2021 ◽  
Vol 13 (1) ◽  
pp. 1-17
Author(s):  
Younus Nidham Ali Mandalawi ◽  
Syamsuri Yaakob ◽  
Wan Azizun Wan Adnan ◽  
Raja Syamsul Azmir Raja Abdullah ◽  
Mohd Hanif Yaacob ◽  
...  
Keyword(s):  
Phase Modulation ◽  
Orthogonal Frequency Division Multiplexing ◽  
Intensity Modulation ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Noise Effect
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