In subject area:Computer Science Spread Spectrum refers to a system in which the transmitted signal is spread over a wide frequency band, much wider than the bandwidth required to transmit the message. This system uses a spreading code to modulate the message signal, resulting in a modulated bas...
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Based on the introduction of the theory of spread spectrum(SS) communication,this paper presents a scheme for applying SS technique in the electric power systems,aiming at solving the problems of the low reliability of data transmission in the traditional power line carier communication mode.It also...
Operation of direct sequence spread spectrum coding and decoding. In this case, it can be seen that chip stream (a) is repeated in waveform (h). This is multiplied by (g) to give the waveform (i). Each group of four bits (as there are four bits in the chip code used in the ...
The linked remote unit and base unit transmit using frequency hopping spread spectrum modulation, using a predetermined frequency hopping sequence and at a point in the sequence unique to the particular base unit. The system may be configured with a plurality of NODES, each of which has a ...
A spread spectrum demodulation circuit includes a correlation signal generator which generates a correlation signal from a reception signal to which a quadrature phase shift keying and a spread spectrum modulation are performed. First and second delay elements have different delay times, and delay the ...
In this chapter we will present the basic idea behind spread spectrum systems together with some of the most important issues regarding their design and implementation. We will start with a definition of spread spectrum systems and consider their advantages as well as their disadvantages, after which...
The technology is used in ultra-high-frequency (UHF) cellular telephone systems in the 800-MHz and 1.9-GHz bands. This is a combination of analog-to-digital conversion and spread spectrum technology. CDM may be defined as a form of multiplexing where the transmitter encodes the signal using...
This WLAN utilizes direct sequence spread spectrum (DSSS) technology at 902MHz RF carrier frequency in its physical layer. Cost effective installation and antijaming property of spread spectrum technology are the major advantages of this work.
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