Results 261 to 270 of about 1,859,997 (304)

A 100Gbps Monolithic Integrated Analog Coherent QPSK Optical Receiver Based on a COSTAS Optical Phase-Locked Loop

2023 Asia Communications and Photonics Conference/2023 International Photonics and Optoelectronics Meetings (ACP/POEM), 2023
This paper presents a 100Gbps Quadrature Phase Shift Keying (QPSK) analog coherent optical receiver. The study emphasizes the utilization of optoelectronic monolithic integration technology to realize the proposed optical receiver, which is based on the ...
Yihao Yang, Yongliang Xiong, Yangming Ren, Qianli Ma, Jintao Xue, Zhiyuan Yu, Nan Qi, Binhao Wang   +7 more
semanticscholar   +1 more source

An Enhanced Synchronization Approach by Combining PMF-FFT and Improved Costas Loop for DSSS

2024 7th International Conference on Information Communication and Signal Processing (ICICSP)
In wireless communication systems, the synchronization of the receiver is critical to the system performance. Traditional methods usually carry out the frequency offset estimation and carrier synchronization separately.
Rong Zhang, Bo Tang, Yanan Guo
semanticscholar   +1 more source

False-Lock Performance Improvement in Costas Loops

IEEE Transactions on Communications, 1982
A technique is described to reduce the probability of false-lock in Costas loops. This is where a frequency offset arises at a multiple of half the incoming data rate due to finite bandwidth of the arm filters. A modification is described to process components of this offset so as to augment the feedback control voltage. The performance is analyzed and
A. Makarios, T. Tozer
openaire   +1 more source

Improved Analog Costas Loop with Fuzzy Logic Controller

Studies in Autonomic, Data-driven and Industrial Computing
F. Sinhababu, A. Mukherjee, S. Sarkar, B. Chatterjee, A. Sarkar   +4 more
exaly   +2 more sources

False lock in Costas loops

[1988] Proceedings. The Twentieth Southeastern Symposium on System Theory, 2003
Results are given on the phenomenon of data-related false lock in a Costas loop which contains a perfect integrator in its loop filter. The input carrier to the loop is assumed to be biphase-modulated with a T' periodic binary sequence constructed from Manchester symbols; there are p symbols per period.
openaire   +1 more source

Design of a Costas loop down converter

2009 52nd IEEE International Midwest Symposium on Circuits and Systems, 2009
This paper presents the the design of a digital down converter (DDC) using a digital Costas loop in a field programmable gate array (FPGA). To reduce the power dissipation we use the CIC filter to perform an efficient decimation, and then follow it with a finite impulse response (FIR) compensation filter that runs at a reduced sampling rate.
Mike Roddewig, Seyed A. Zekavat, Saeid Nooshabadi   +2 more
openaire   +1 more source

Necessary Condition for the Costas Loop to Track Desired Signal Under CW Interference

IEEE Transactions on Communications
When continuous wave (CW) interference is introduced into the Costas loop, the loop may lock onto the interference signal if the amplitude of the interference reaches a certain threshold, or if the carrier frequency of the interference signal is very ...
Wenyi Wang, Yuhang Liang
semanticscholar   +1 more source

False Lock and Bifurcation in Costas Loops

SIAM Journal on Applied Mathematics, 1989
Summary: New results are given on the phenomenon of data-related false lock in a Costas loop that contains a perfect integrator in its loop filter. The input carrier to the loop is assumed to be bi-phase modulated with a \(T'\) periodic binary sequence constructed from Manchester symbols; there are p symbols per period.
openaire   +1 more source

Synchronization of TFM typed signals using costas loops

International Journal of Electronics, 1983
Abstract The possibility of using a costas loop for the carrier regeneration in tamed frequency modulation (TFM) signal is investigated. By first setting up all important phase changing rules and suitably classifying the various possible phase paths, the equivalent phase detector characteristics (for TFM signal input) of the four phase costas loop are ...
HEN-WAI TSAO, TUNG-SEN CHENG
openaire   +1 more source

Digital Costas loop design for coherent microsatellite transponders

Proceedings, IEEE Aerospace Conference, 2003
This paper presents a design for a satellite transponder using a modified superheterodyne receiver, a digital Costas loop and a conventional transmitter. The overall architecture of the transponder is presented, along with detailed design information.
G. Mitchell, T. Guichon
openaire   +1 more source