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In direct sequence (DS) spread spectrum communication system, the first condition of receiving correct data is code synchronization. Synchronization is one of the key techniques in spread spectrum communication systems. This paper presents pseudo-noise (PN) code acquisition and tracking technology. Spread spectrum communication technology is combined with software radio technology to constitute spread...
This paper reports a practical design and construction of a wideband channel sounding system for air-to-ground measurements at C band. A high precision Global Positioning System (GPS) time-stamped system is developed using the virtual instrument (VI) concept. With the implementations of the spread spectrum technique and through matched filter detection, the performance of the designed sounding system...
In this paper a pseudo-noise code synchronizer circuit using for DS-DQPSK spread spectrum receiver for audio applications is designed. It is implemented with 0.6 micron technology of MOSIS Company by use of serial method. The synchronous and asynchronous circuits are used in control unit. As a result, this circuit doesnpsilat need many control clock pulses and its clock pulse generator unit is very...
Code division multiple access (CDMA) is a multiplexing technique that spreads the spectrum of user data so that it occupies a bandwidth much greater than that is necessary to send the information. CDMA systems have been highly successful due to the huge increase in capacity offered compared to other technologies. An effective technique to further increase the capacity of time-varying wireless channels...
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