نتایج جستجو برای: spread spectrum communication

تعداد نتایج: 654121  

Journal: :IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences 2020

Journal: :isecure, the isc international journal of information security 0
n. zarmehi electrical engineering department, sharif university of technology, tehran, iran advanced communications research institute, sharif university of technology, tehran, iran m. r. aref electrical engineering department, sharif university of technology, tehran, iran information systems and security lab. (issl), electrical engineering department, sharif university of technology, tehran, iran

this paper investigates the multiplicative spread spectrum watermarking method for the image. the information bit is spreaded into middle-frequency discrete cosine transform (dct) coefficients of each block of an image using a generated pseudo-random sequence. unlike the conventional signal modeling, we suppose that both signal and noise are distributed with laplacian distribution, because the ...

2014
Nilesh Shirude Manoj Gofane

DSSS (Direct Sequence Spread Spectrum) is one of the main technique of spread spectrum system and is the most common version use for military communication. In this paper, I have designed and implemented RADAR (Radio Wave Detection and Ranging) transmitter and receiver using direct sequence spread spectrum for range estimation. Most challenging part in RADAR system is to be getting better accur...

Journal: :Journal of physics 2023

Abstract The spread spectrum communication method has strong anti-noise and anti-fading capability, but it also brings the problem of low information transmission efficiency. paper proposes a multi-channel M-ary method, using recursive decoding algorithm to reduce bit error rate. In combination with channel equalization technique based on virtual time reversal mirror technique, scheme improves ...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید