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Communications in the aerospace environment is often very challenging. These challenges increase with the demand for higher data rates. This paper focuses on design and implementation of synchronization circuits for Direct Sequence Spread Spectrum (DSSS) receivers using Field Programmable Gate Arrays (FPGAs). In aerospace communications, it is the wireless digital communications receiver which bears...
By the way of simulations using computer, the statistical characteristics of locking in synchronism time, has been determined for the synchronization system, concluding two twin subsystems of spread spectrum signals detection. The criterion of the meaning moment time detection from the domain of uncertainty is “m-multiple repentance iteratively” and “k of n”. VHDL-model of the synchronization system...
A novel synchronization technique for despreading codes for DS-CDMA utilizing discrete data obtained by sampling is proposed. The technique enables despreading codes to be synchronized with received signals without using additional tracking circuits even when sampling phases deviate from phases of received signals. We applied this synchronization technique to a DS-CDMA receiver using an RF direct...
Spread spectrum technology can effectively solve the problems such as bad channel environment, multi-path fading etc between mobile station and subscribers. At present the research on the synchronization of PN code is more concentrated on how to implement fast acquisition. This paper introduces the sliding correlation method of PN code acquisition, gives out a serial and parallel acquisition method...
This paper designs and accomplishes a fast frequency hopping system with 40 Khps based on the software radio. The paper presents several innovational techniques for realizing hopping system, such as frequency hopper, frequency hopping sequence, bit synchronization, hopping pattern synchronization, hopping signal demodulation, etc. Then the paper presents system's detailed hardware/software architecture...
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