A 170cm transmission distance, high speed IntraBody Communication receiver design and its application to FPGA audio player

2013 ◽  
Author(s):  
Hao Wang ◽  
C.S. Choy
Keyword(s):  
High Speed ◽  
Receiver Design ◽  
Transmission Distance

40 Gb/s High-speed mode-division multiplexing transmission employing NRZ modulation format

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Rabiu Imam Sabitu ◽  
Nafizah Goriman Khan ◽  
Amin Malekmohammadi
Keyword(s):  
System Performance ◽  
High Speed ◽  
Direct Detection ◽  
Signal To Noise Ratio ◽  
Optical Signal ◽  
Threshold Power ◽  
Modulation Format ◽  
Transmission Distance ◽  
Mode Division Multiplexing ◽  
Speed Mode

AbstractThis report examines the performance of a high-speed MDM transmission system supporting four nondegenerate spatial modes at 10 Gb/s. The analysis adopts the NRZ modulation format to evaluate the system performance in terms of a minimum power required (PN) and the nonlinear threshold power (PTH) at a BER of 10−9. The receiver sensitivity, optical signal-to-noise ratio, and the maximum transmission distance were investigated using the direct detection by employing a multimode erbium-doped amplifier (MM-EDFA). It was found that by properly optimizing the MM-EDFA, the system performance can significantly be improved.

scholarly journals Experimental Demonstration of Special-Shaped 32-Quadrature Amplitude Modulation Constellations for Visible Light Communications

2018 ◽  
Vol 2018 ◽  
pp. 1-7
Author(s):  
Xinyue Guo ◽  
Shuangshuang Li ◽  
Yang Guo
Keyword(s):  
Visible Light ◽  
Amplitude Modulation ◽  
High Speed ◽  
Light Emitting Diode ◽  
Rapid Development ◽  
Average Power ◽  
Visible Light Communication ◽  
Quadrature Amplitude Modulation ◽  
Visible Light Communications ◽  
Transmission Distance

With the rapid development of light-emitting diode, visible light communication (VLC) has become a candidate technology for the next generation of high-speed indoor wireless communication. In this paper, we investigate the performance of the 32-quadrature amplitude modulation (32-QAM) constellation shaping schemes for the first time, where two special circular constellations, named Circular (4, 11, 17) and Circular (1, 5, 11, 15), and a triangular constellation are proposed based on the Shannon’s criterion. Theoretical analysis indicates that the triangular constellation scheme has the largest minimum Euclidian distance while the Circular (4, 11, 17) scheme achieves the lowest peak-to-average power ratio (PAPR). Experimental results show that the bit error rate performance is finally decided by the value of PAPR in the VLC system due to the serious nonlinearity of the LED, where the Circular (4, 11, 17) scheme always performs best under the 7% preforward error correction threshold of 3.8 × 10−3 with 62.5Mb/s transmission data rate and 1-meter transmission distance.

Comparative Analysis of High Speed 20/20 Gbps OTDM-PON, WDM-PON and TWDM-PON for Long-Reach NG-PON2

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Meet Kumari ◽  
Reecha Sharma ◽  
Anu Sheetal
Keyword(s):  
Wavelength Division Multiplexing ◽  
High Speed ◽  
Optical Network ◽  
Access Network ◽  
Cost Effective ◽  
Input Power ◽  
Passive Optical Network ◽  
Wavelength Division ◽  
Transmission Distance ◽  
Wdm Pon

AbstractNowadays, bandwidth demand is enormously increasing, that causes the existing passive optical network (PON) to become the future optical access network. In this paper, next generation passive optical network 2 (NG-PON2) based, optical time division multiplexing passive optical network (OTDM-PON), wavelength division multiplexing passive optical network (WDM-PON) and time & wavelength division multiplexing passive optical network (TWDM-PON) systems with 20 Gbps (8 × 2.5 Gbps) downstream and 20 Gbps (8 × 2.5 Gbps) upstream capacity for eight optical network units has been proposed. The performance has been compared by varying the input power (−6 to 27 dBm) and transmission distance (10–130 km) in terms of Q-factor and optical received power in the presence of fiber noise and non-linearities. It has been observed that TWDM-PON outperforms OTDM-PON and WDM-PON for high input power and data rate (20/20 Gbps). Also, TWDM-PON shows its superiority for long-reach transmission up to 130 km, which is a cost-effective solution for future NG-PON2 applications.

scholarly journals Multilevel Manchester (2 bits/symbol) coding with optical equaliser for increasing the transmission distance of high-speed fibre optic links

2020 ◽  
Vol 14 (4) ◽  
pp. 182-188
Author(s):  
Festus Idowu Oluwajobi ◽  
Dong-Nhat Nguyen ◽  
Nafizah Khan ◽  
Amin Malekmohammadi
Keyword(s):  
High Speed ◽  
Fibre Optic ◽  
Transmission Distance

Study of Thermal Expansion of a Vertical Motion Ball-Screw System Operated at High Rotational Speed

2015 ◽  
Vol 642 ◽  
pp. 307-310
Author(s):  
Sheng Hao Hung ◽  
Chin Chung Wei
Keyword(s):  
Thermal Expansion ◽  
High Speed ◽  
Vertical Motion ◽  
Contact Forces ◽  
Ball Screw ◽  
Positioning Error ◽  
High Rotational Speed ◽  
Contact Areas ◽  
Transmission Distance ◽  
Screw Driving

A ball-screw system is widely used in high speed transmission platforms. High transmission speed brings high frictional force, heat and thermal expansion occurring on contact areas of ball, screw and nut. Positioning error of platform is affected by the thermal expansion during linear transmission. A vertical motion of ball-screw driving system was used for high speed transmission test. Thermal expansion of screw and positioning error were measured for discussion their effects. Cyclic vertical motion during a long transmission distance, 2 km, will integrate thermal heat to ball, screw and nut, thermal expansion of screw is also occurred. From experiments, temperature rising and thermal expansion of screw and nut were recorded and calculated for estimate elongation and positioning error of a vertical motion high speed ball-screw. Positioning error is not totally respected thermal elongation effects of screw and nut owing to contact forces caused by wear and thermal expansion at contact areas comparing to the heavy axial load is relative small in a vertical motion ball-screw system. Therefore, the structure stiffness is not affected significantly by thermal effect and wear.

scholarly journals Turbo-coded Ultra Long Haul System with Probabilistic Shaped 16QAM Modulation

2021 ◽  
Vol 2112 (1) ◽  
pp. 012027
Author(s):  
Ziqi Wang ◽  
Yuzhe Li ◽  
Yuan Gao ◽  
Xishuo Wang ◽  
Qi Zhang
Keyword(s):  
Communication Technology ◽  
Mobile Communication ◽  
High Speed ◽  
Turbo Code ◽  
Optical Fiber Communication ◽  
Modulation Scheme ◽  
Modulation Format ◽  
Transmission Distance ◽  
Bit Error Ratio ◽  
Mobile Communication Technology

Abstract With the rapid growth and development of 5G (5th Generation Mobile Communication Technology) and the incoming of 6G (6th Generation Mobile Communication Technology), the demand for high-speed and flexible communication solutions is becoming far more urgent. Within this paper, a novel code modulation scheme based on PS (probabilistic shaping) and Turbo code is proposed with its effectiveness is confirmed by the results of simulation. The results inform that in an optical fiber communication system with 56 Gb/s rate and 3000 km transmission distance, when the SNR (signal-noise ratio) is greater than 3.5 dB, the Turbo-coded PS-16QAM modulation format can achieve reliable transmission. The proposed scheme performs the best in BER (bit error ratio) and average launch power in the four cases of uniform 16QAM, PS-16QAM, Turbo-coded 16QAM with and itself. The proposed scheme is a potential solution in the future 5G communication.

A Media Access Control Protocol for Broadcast Type Super High-Speed WDM Networks

2003 ◽  
Vol 04 (02) ◽  
pp. 147-162
Author(s):  
Akio Koyama ◽  
Masato Akiyama
Keyword(s):  
New Media ◽  
Wavelength Division Multiplexing ◽  
High Speed ◽  
Wdm Networks ◽  
Media Access Control ◽  
Media Access ◽  
Wavelength Division ◽  
Transmission Distance ◽  
Long Time ◽  
Control Packets

In this paper, we propose a new media access protocol for single hop Wavelength Division Multiplexing (WDM) networks with a passive star topology. In the conventional protocols, when the control packets collided with other ones or the packets didn't get a data channel from the channel reservation mechanism, these packets should be retransmitted. But, when transmission distance becomes long, it takes a long time to transmit the control packets and the propogation dalay time will be long. We propose a new protocol that can allocate data channels without retransmitting control packets except the collided ones. By using the proposed protocol, it is possible to reduce the transmission delay time and to get high throughput because the number of retransmitted control packets is reduced. The simulation results show that the proposed protocol has good performance comparied with conventional protocols.

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