Design and Implementation of OFDM Baseband Transmission System Based on CORDIC Algorithm and Pipeline FFT

2012 ◽  
Vol 190-191 ◽  
pp. 962-967
Author(s):  
Jun Yang ◽  
Hong Wei Ding ◽  
Ga Zhao ◽  
Ping Ping Shu
Keyword(s):  
High Speed ◽  
Transmission Rate ◽  
Adaptive Modulation ◽  
Signal Transmission ◽  
Transmission System ◽  
Cordic Algorithm ◽  
Clock Frequency ◽  
Modulation Mode ◽  
Baseband Signal ◽  
High Flexibility

This paper designed an OFDM baseband signal transmission system, which adopted CORDIC algorithm, pipeline organization and high-speed floating-point butterfly unit to complete the customized FFT Processor, and the modulation of the signal was realized by enhancing modulation mode (64-QAM) in the adaptive modulation mode. Meanwhile, due to FPGA technology is reconfigurable and parallel, the signal has a higher transmission rate. The system used FPGA resources reasonably and integrated highly, simplifying the complexity of the system; eventually it was adapted to the EP2C35F672C6 chip of Altera, and can be normally operated in the clock frequency of 100 MHz; At the same time, this system the system has high flexibility and generality, simple structure, and good clutter suppression, so it has a certain application prospects.

scholarly journals Research and Analysis of Digital Baseband Transmission System Based on MATLAB

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Chai Jianwen
Keyword(s):  
Signal Transmission ◽  
Digital Signal ◽  
Transmission System ◽  
Simulation Software ◽  
Line Pattern ◽  
Matlab Simulation ◽  
Simulation Process ◽  
Transmission Process ◽  
Baseband Signal ◽  
Digital Baseband

This paper mainly studies the basic concept of baseband transmission of digital signal and the transmission processof digital signal baseband transmission and how to design digital baseband transmission system with MATLABsoftware simulation. This paper fi rst introduces the theoretical basis of this subject, including digital communication,the composition of digital baseband transmission system and digital baseband signal transmission process. Then thepaper introduced the characteristics of digital baseband transmission system, including digital PAM signal powerdensity and common line pattern, and by comparing choosing the fi nal bipolar zero return code. Then we introducedthe MATLAB simulation software. The conditions of the best reception of the digital baseband signal are describedand how the waveform of the baseband signal is observed by an oscilloscope. Finally, according to the basic stepsof simulation process, the simulation process of digital baseband transmission system is realized by MATLABsimulation tool, and the system is analyzed.

scholarly journals MIMO BASED HIGH SPEED OPTICAL FIBER COMMUNICATION SYSTEM

2019 ◽  
Vol 2019 (02) ◽  
pp. 107-116
Author(s):  
Karrupusamy P.
Keyword(s):  
Optical Fiber ◽  
Communication System ◽  
High Speed ◽  
Transmission Rate ◽  
Signal Transmission ◽  
Multiple Input Multiple Output ◽  
Optical Fiber Communication ◽  
60 Ghz ◽  
Fiber System ◽  
Differential Phase Shift

As the telecommunication services totally relies on the optical fiber for extending communications, it necessary that the optical communication system be capable of handling high speed, multiple channels and long haul signal transmission. recently the emergence of the optical coherent 100 GB/s and the digital signal processing has made possible the perfect signal transmission even for the MIMO (multiple input multiple output system) as they are well reformed to permit multiple wireless signal that holds different carrier frequencies. So the optical fiber system has become prominent among the applications like, large universities, banks and other private networks. However the speed in the transmission of the multiple wireless signals through single cable experiences performance issues in terms of speed, so the proposed method utilizes the 60 GHz, radio over fiber MIMO with effective spectrum allocation and the return zero differential phase shift keying to improve the communication speed and suppress the crosstalk respectively. The proposed system enriches the seamless communication with the QPSK-OFDM MIMO channels achieving 85 % in the data transmission rate, reducing the error correction rate to 5%.

A FPGA-Based Design of Floating-Point FFT Processor with Dual-Core

2013 ◽  
Vol 811 ◽  
pp. 441-446
Author(s):  
Jun Ding ◽  
Na Li
Keyword(s):  
Fourier Transform ◽  
High Speed ◽  
Complex Multiplication ◽  
Floating Point ◽  
System Throughput ◽  
Cordic Algorithm ◽  
Clock Frequency ◽  
Sample Number ◽  
Fft Processor ◽  
Dual Core

This paper presents a dual-core floating point FFT processor design based on CORDIC algorithm, enabling high-speed floating-point real-time FFT computation, and its time complexity is (N / 4) Log (N / 2). The design unifiesthe floating complex multiplication and the evaluationof twiddle factors into an iteration, which not only reduces the complexity of complex multiplication but also reduces the difficulty when the butterfly unit deals with floating-point in fast Fourier transform. The butterfly unit unaffected by the size of external memory can handle the Fourier transform with high sample number, both having wider handling range and high handling precision. It uses two logical cores and pipeline technology to improve overall system throughput, with simple hardware structure and system stability.At the end, it does the post-simulation on the Altera chip EP2C35F672C6, and its timing simulation can be run properly under the 50 MHz clock frequency.

Design of a SoC With High-Speed DDC for Software Radio Receiver

2012 ◽  
Vol 605-607 ◽  
pp. 1875-1879 ◽  
Author(s):  
Jun Deng ◽  
Lin Tao Liu ◽  
Yu Jing Li ◽  
Xiao Zong Huang ◽  
Xu Huang ◽  
...  
Keyword(s):  
High Speed ◽  
Software Radio ◽  
Intermediate Frequency ◽  
Cmos Technology ◽  
Radio Receiver ◽  
Clock Frequency ◽  
Baseband Signal ◽  
Baseband Signal Processing ◽  
Good Potential ◽  
On Chip

This paper presents a novel scheme for software radio receiver application, which integrates a high-speed digital down converter (DDC) block into a SoC (system on chip) based on OR1200 CPU. The proposed design can transform intermediate frequency (IF) signal to baseband signal and realize the real-time baseband signal processing. The simulation results indicate that the design is capable of accepting data at a 200MHz sample rate and the verification results based on Xilinx FPGA show that the SFDR of DDC can reach to 70.59dBFS.The synthesized results on 0.18um CMOS technology reveal that the maximum clock frequency can reach to 116MHz and the total area is 5.662mm2, and the corresponding power consumption is below 150mW. It should have a good potential for wireless communication applications.

Research of WLAN Adaptive Modulation Technology Based on OFDM Subcarrier Amplitude Frequency Characteristics

2014 ◽  
Vol 513-517 ◽  
pp. 1187-1191
Author(s):  
Zeng You Sun ◽  
Xiao Fan Sun ◽  
Xia Ling
Keyword(s):  
High Speed ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Adaptive Modulation ◽  
Local Area ◽  
Spectrum Efficiency ◽  
Modulation Method ◽  
System Throughput ◽  
Area Network ◽  
Modulation Mode

Expound the existing modulation mode of the present wireless local area network. Directing at the problem that when single modulation method conveys data with high speed in the frequency selective fading channel, the system throughput will be declined and the efficiency of the spectrum will be lowered . Put forward the scheme that the OFDM sub-carrier will use different modulation modes after dynamic groups by amplitude frequency response. Simulation results show that the scheme will lower the complexity of the system achievement, and can get a higher spectrum efficiency.

Study on Signal Integrity Simulation for High Speed Serial Rapid IO

2013 ◽  
Vol 340 ◽  
pp. 881-886 ◽  
Author(s):  
Hong Xu Jiang ◽  
Xiao Hong Zhang ◽  
Wei Zhao ◽  
Jin Yuan Lu
Keyword(s):  
High Speed ◽  
Simulation Analysis ◽  
Transmission Rate ◽  
Signal Integrity ◽  
Signal Transmission ◽  
Hardware Design ◽  
Strong Support ◽  
Parameters Optimization ◽  
Design Parameters ◽  
Signal Quality

With the increases of signal transmission rate in digital systems, the signal integrity becomes increasingly important in high-speed circuit design. During the hardware design of high-speed serial Rapid IO, signal integrity simulation of 5Gbps high-speed serial bus had been carried out by using Channel Analysis tools. Reliable data was formed by effectively analysis and evaluation of pre-simulation, the signal quality of high-speed serial Rapid IO was verified by post-simulation. The non-ideal design parameters were optimized by referring to the effective data obtained in pre-simulation. Signal quality has been greatly improved by parameters optimization. Signal integrity simulation analysis and verification of serial Rapid IO provides strong support for the design and significantly improves the efficiency of hardware design.

A 2 × 20 Gbps hybrid MDM-OFDM–based high-altitude platform-to-satellite FSO transmission system

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Vel Murugan Gomathy ◽  
T. V. Paramasivam Sundararajan ◽  
C. Sengodan Boopathi ◽  
Pandiyan Venkatesh Kumar ◽  
Krishnamoorthy Vinoth Kumar ◽  
...  
Keyword(s):  
High Altitude ◽  
Orthogonal Frequency Division Multiplexing ◽  
High Speed ◽  
Satellite Communication ◽  
Input Power ◽  
Transmission System ◽  
Communication Link ◽  
Space Optics ◽  
High Altitude Platform ◽  
Mode Division Multiplexing

AbstractIn the present study, the application of free space optics (FSO) transmission system to realize a long-reach high-altitude platform (HAP)-to-satellite communication link has been exploited. High-speed information transmission without interference is accomplished using orthogonal frequency division multiplexing (OFDM). Further, the information capacity of the proposed system is increased by employing mode division multiplexing (MDM). We have investigated the proposed MDM-OFDM-HAP-to-satellite FSO transmission system performance over varying FSO range, diameter of the receiver, pointing errors, and input power. Also, an improved transmission performance of the proposed system using a square root module is reported.

Design of embedded acoustic image acquisition system for wireless sensor network

2021 ◽  
pp. 1-8
Author(s):  
Xiaoping Huang ◽  
Fangyi Wen ◽  
Zhongxin Wei
Keyword(s):  
Transmission Rate ◽  
Image Acquisition ◽  
Transmission System ◽  
Video Data ◽  
Wireless Transmission ◽  
Acquisition System ◽  
Wireless Sensor ◽  
Acoustic Image ◽  
Image Acquisition System ◽  
Embedded Image

In recent years, with the development of communication technology, embedded computing technology and sensor technology, it has become increasingly mature. Micro sensors with sensing, computing and communication capabilities have appeared in large numbers and developed rapidly, making wireless sensor networks widely used. People put forward higher requirements for the accuracy, reliability and flexibility of the image acquisition system. The image transmission system using analog technology not only has low image quality, but also has a serious waste of system resources, is not easy to form a complex network structure, and has poor functional scalability. In view of the actual needs of the current image acquisition and wireless transmission system, based on embedded technology, image acquisition, processing technology and network transmission technology, this paper proposes and designs a low-cost, high-reliability embedded image acquisition and wireless transmission system. Experimental tests show that this system has reasonable design, high video coding efficiency, good image continuity, stable operation, and basically realizes the display, storage and playback functions of the collected video data. Improve the transmission rate of the system and reduce the distortion caused by compression in terms of image compression. At the same time, it supports multiple image resolutions, frame rate options and multiple video formats, and the system’s transmission rate can adapt to the state of the network. This design fulfills the basic requirements of an embedded image acquisition system based on network technology, and provides a good foundation for the next development of a gigabit network-based image acquisition system.

scholarly journals Lignin-Containing Coatings for Packaging Materials—Pilot Trials

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1595
Author(s):  
Asif Javed ◽  
Peter Rättö ◽  
Lars Järnström ◽  
Henrik Ullsten
Keyword(s):  
High Speed ◽  
Water Solubility ◽  
Transmission Rate ◽  
Kraft Lignin ◽  
Packaging Materials ◽  
Water Contact ◽  
Pilot Trials ◽  
Significant Difference ◽  
Ph Level ◽  
Ammonium Zirconium Carbonate

One severe weakness of most biopolymers, in terms of their use as packaging materials, is their relatively high solubility in water. The addition of kraft lignin to starch coating formulations has been shown to reduce the water solubility of starch in dry coatings. However, lignin may also migrate into aqueous solutions. For this paper, kraft lignin isolated using the LignoBoost process was used in order to examine the effect of pH level on the solubility of lignin with and without ammonium zirconium carbonate (AZC). Machine-glazed (MG) paper was coated in a pilot coating machine, with the moving substrate at high speed, and laboratory-coated samples were used as a reference when measuring defects (number of pinholes). Kraft lignin became soluble in water at lower pH levels when starch was added to the solution, due to the interactions between starch and lignin. This made it possible to lower the pH of the coating solutions, resulting in increased water stability of the dry samples; that is, the migration of lignin to the model liquids decreased when the pH of the coating solutions was reduced. No significant difference was observed in the water vapor transmission rate (WVTR) between high and low pH for the pilot-coated samples. The addition of AZC to the formulation reduced the migration of lignin from the coatings to the model liquids and led to an increase in the water contact angle, but also increased the number of pinholes in the pilot-coated samples.

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