baseband/IF spread-spectrum transmitter
Design of a High Range, High Efficiency Spread Spectrum Transmitter for Audio Communication Applications
... widely spread technology with higher flexibility and lower cost compared to wired communications is an inseparable part of the modern life ...sequence spread spectrum (DSSS) systems gain popularity ...
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Spread Spectrum Sensing Techniques for Transformer Frequency Response Data
... is spread at base-band and then modulated by a carrier signal ...DSSS transmitter depends on the length of pseudorandom bit ...are baseband data signal, PN sequence, modulation and transmission ...
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Direct Sequence Spread Spectrum with Barker Code and QPSK
... depicts transmitter, channel and receiver of DSSS system. In the transmitter stage, the baseband data signal m(t) is spread using PN-Sequence c(t) ...resultant spread signal s(t) is ...
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Chaos based Communication System Using Reed Solomon (RS) Coding for AWGN & Rayleigh Fading Channels
... The principle of chaotic masking hints at the larger issue of communication secrecy. Certainly, fundamental properties of chaotic systems seem to make them ideal for this purpose. Chaotic systems are inherently ...
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BER COMPARISON BETWEEN CDMA & COFDM MODEL
... Ways & means to benefit were created through spread spectrum techniques in products & commercial systems. In this write up we shall discuss and consider applications to satellite mobile ...
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Chapter 15. Cognitive Radio Network Security
... Primary User Emulation Attacks Sensor Primary signal transmitter Sensor Sensor Sensing data collector. Data fusion Final spectrum sensing result Distributed Spectrum Sensing[r] ...
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A joint adaptive MMSE downlink receiver
... Channelisation codes 1 to 3 are applied to spread the spectrum of tbe data The spread spectrum signal is organised in data bursts of type 1 and transmitted through a baseband equivalent [r] ...
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Local positioning with sensor-enabled passive multistandard RFID transponders
... reflection coefficients. The line-of-sight signal which is di- rectly backscattered from the UHF transponder to the FMCW reader is the desired component for the distance measure- ment. To distinguish it from the ...
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Direct-sequence spread-spectrum ultrasonic testing device
... Techniques for providing an ultrasonic flaw detection system are disclosed. A continuous wave of wide-band direct-sequence spread-spectrum signals continuously drives one or more transmitting transducers, ...
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On the Implementation of Spread Spectrum Fingerprinting in Asymmetric Cryptographic Protocol
... the spread spectrum watermarking technique by carefully designing parameters for rounding ...the spread spectrum watermarking technique in [4] is applied, the precision of the representing ...
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SPECTRUM SENSING TECHNIQUES AND ISSUES IN COGNITIVE RADIO
... current spectrum scarcity problem. In the cognitive radio cycle, Spectrum sensing plays the most crucial role depending on which further steps are carried ...standard spectrum sensing techniques are ...
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Variable Frequency Modulation for EMI Suppressing in Power Converter
... variable-frequency spread spectrum sig- naling is shown in Figure ...the spectrum dis- tribution of is different contained in Figures 3(a) and (b), but the total energy is the same in both cases, the ...
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Secure Spread Spectrum Watermarking for Telemedicine Applications
... secure spread-spectrum based watermarking algorithm for embedding sensitive medical information like physician’s signature/identify- cation code or patient identity code into radiological im- age for ...
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Spread Spectrum Based Digital Audio Watermarking
... to its maximum extent. In the process of watermark extraction, the host data undergoes discrete cosine transform. Then, generation of orthonormal PN sequences occurs where each of these is representative of a sequence of ...
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Optimal watermark embedding combining spread spectrum and quantization
... This paper presents an optimal watermark embedding method combining spread spectrum and quantization. In the method, the host signal vector is quantized to embed a multiple-bit watermark, and meanwhile, the ...
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FPGA Implimentation of DSSS Transmitter Using Pseudo Chaotic Sequence
... In spread spectrum communication systems, Pseudo noise sequence is used to spread the bandwidth of transmitting ...in spread spectrum ...can spread the bandwidth in larger ...
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SPREAD-SPECTRUM techniques have been widely employed
... S PREAD-SPECTRUM techniques have been widely em- ployed in modern radar systems to improve the radar range resolution [1]. A spectrum-spread signal is usually generated through pulse chirping or ...
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A local area network using spread spectrum techniques
... A Local Area Network Using Spread Spectrum Techniques.. A Thesis submitted for examination for the Degree of Master of Engineering (Electrical).[r] ...
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Security for Digital Data using Combination of Audio Steganography and Cryptography
... recently. Spread spectrum (SS) technique has developed rapidly in this area due to the advantages of good robustness and immunity to noise ...The spread-spectrum techniques for watermarking ...
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Quality Improvement in Millimeter Wave Generation Techniques
... electromagnetic spectrum with frequency ranging from 30-300 GHz and the corresponding wavelength is from 10 ...electromagnetic spectrum is less congested and crowded, so large bandwidth is available for ...
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