Research on Spread Spectrum Communication Technique based on Binary Offset Subcarrier Frequency Sweep and Related Methods

Abstract

In this paper, we conduct theoretical research and numerical simulation on the spread spectrum communication technique based on binary offset subcarrier frequency sweep and related methods. At present, most of the spread spectrum signal generation did not give the effect of channel filter and a large number of related studies have shown that channel non-ideal properties of channel filter will produce great influence to the precision. Therefore, it is best to consider when the signal will generate channel filter effects on signal. The maximum differential values between different paths which is also known as multipath time delays are studied in this research. Multipath propagation phenomenon usually digital communication element in the overlap problem and causes the judgment of errors and error occurs which affect the improvement of wireless communication speed and reliability of communication. Therefore, we conduct modification based on the related prior research result. In our method, more specific models are analyzed with inductions and the experimental simulation proves the effectiveness of the proposed approach. In the future, we have scheduled to do more in-depth analysis to optimize the current approach. In troduction The traditional approach of designing the communications system could be dated back to the Shannon's time which was to treat coding and modulation as separate procedures that can each be studied and optimized individually. However, from the perspective of signal detection, more natural thi nk indicated that they are a single and unified process. As for the principle for the first time using tre llis coded modulation method, short wave transmission way pf the main has two kinds: one for the ground wave, another for sky wave. The ground wave propagated along the surface of the earth, through this way the propagation distance is mainly decided by the surface dielectric properties. It is enhanced by the ground wave attenuation with the increase of frequency that short wave propagation in ground wave manner will use the commonly used transmission power while short wave propagation distance up to only a few hundred kilometers. Therefore, the ground is not the main approach to spread use in shortwave communication. The generation of spread spectrum signal generally could be separated into two ways (1). After one is using relevant models, this model can effectively shorten the simulation time, but the results of related after modeling will ignore the code level of detail. Before one is related to model, this model can achieve high fidelity of spread spectrum signal is generated and the disadvantage is that the simulation computation which results that the efficiency is not high. At present, most of the spread spectrum signal generation did not give the effect of channel filter and a large number of studies have shown that channel non-ideal properties of channel filter will produce great influence to the precision, so it is best to consider when to signal generated channel filter effects on signal.