Software Radio Frequency Hopping Waveform Time Synchronization Technology Research

Software radio technology as wireless communication and development trends, getmore and more extensive attention. SCA as a kind of communication system designstandard, the design philosophy correspond with the software radio’s software andhardware of separation of thoughts, so in software radio design got a lot of applications.The SCA waveform development and validation is an important part of the design flowwhich is based on standard SCA.This paper is come from the project of the frequency hopping waveform developmentwhich is based on stadard SCA, the goal is to realize analog voice frequency hoppingcommunicaton on the SCA platform with200jump/s. Frequency hopping wave designdivided into algorithm function design and packaging design of based on standardSCA.In the link of frequency hopping algorithm function designing, how to fast,accurate to realize the sending and receiving time synchronization is the key of thefrequency hopping communication. This paper focuses on the frequency hoppingcommunication simulation of synchronous module simulation and written in c++codesimultaneous module function.Firstly, according to rough time synchronization, the main methods are three methods,they are serial capture method, parallel capture method and waiting for the capture. First,three methods of principle is expounded, then respectively in three different methods ofthe time of the capture and capture probability, false alarm probability and leakagealarm probability in the derivation of the formula, and finally presents the three differentmethods of the simulation process and the simulation results, and the simulation resultsare analyzed, and finally according to project indicators demand, choose the waiting forcapture method.Secondly, according to the time of pure synchronization, the main methods are doublecorrelator advanced-lag incoherent tracking ring and single correlator tracking loop,first, give the two kinds of respectively tracking algorithm’s principle, then give theadvanced-lag incoherent tracking ring’s principle formula of the process. Then, get therough time synchronization and fine synchronization time together, use the wait forcapture of the thick synchronous algorithm and the advanced-lag incoherent trackingring the of fine synchronous, get a joint simulation, the simulation results show that thetracking ring can get stable output in six jump time.Thirdly, division and design the function of synchronous components. The first,design the component port, then according to the function of synchronous, thecomponent is divided into capture components and track components, and for eachcomponent to the UML model design, the component interface function parameters andfunction prototype carried on the detailed definition, finally using c++code realizedthe capture components and tracking component function.Finally, to capture components and tracking component function test and analysis. First design the signal source components and received signal components, respective toconnect the capture and tracking component’s input and output port. Use the controlprogram to connect this several components, and start components data processingthread, complete data transmission between components. And the data processingresults save to file, use MATLAB import documents to the statistics, test indices such asthe time of the capture, capture probability, the false alarm probability and theintermediate frequency output signal after tracking, the test results accord with theproject requirement.This paper studies the frequency hopping time synchronization, provide thetheoretical basis for development of frequency hopping waveform which is based on thestandard SCA, the capture and tracking component function is normal, can beindependent component which is used as for a third party.