The University of Nairobi Department of Electrical and Electronic Engineering Project Title: Acquisition of Direct-sequence Spread-spectrum Signals Project Code: Prj011 Name: Joseph Kibugi Chege
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Design of a High Range, High Efficiency Spread Spectrum Transmitter for Audio Communication Applications
This work proposes a direct sequence spread spectrum transmitter with high transmission range and efficiency for audio signals. It is shown that by choosing high process gain for spread spectrum signal the data could reach a range of 55km in the 2.4GHz ISM band. By employing a light modulation scheme, we have a relaxed SNR requirement for having a low bit error rate (BER) which translates to re...
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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 ...
متن کاملA Novel Multi-user Detection Approach on Fluctuations of Autocorrelation Estimators in Non-Cooperative Communication
Recently, blind multi-user detection has become an important topic in code division multiple access (CDMA) systems. Direct-Sequence Spread Spectrum (DSSS) signals are well-known due to their low probability of detection, and secure communication. In this article, the problem of blind multi-user detection is studied in variable processing gain direct-sequence code division multiple access (VPG D...
متن کاملImproving Long PN-Code Acquisition in the Presence of Doppler Frequency Shifts
Wireless communication is the major form of connection nowadays. In most cases it exploits the benefits of the spread spectrum techniques to overcome channel introduced corruptions like Doppler residual frequency, noise, interference and jamming. These techniques also enhance the security and quality of the link. Using long spreading pseudo-noise codes provides further security for the link tho...
متن کاملProject Title : MINIATURE NUCLEAR MAGNETIC RESONANCE SPECTROMETER FOR IN - SITU AND IN - PROCESS ANALYSIS AND MONITORING
Lead Principle Investigator: Co-Investigator Gennady Friedman, Associate Professor, Alan Feinerman, Associate Professor, The University of Illinois at Chicago The University of Illinois at Chicago Department of Electrical Engineering Department of Electrical Engineering and Computer Science, Mail Code 154 and Computer Science, Mail Code 154 851 South Morgan Street 851 South Morgan Street Chicag...
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تاریخ انتشار 2016