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自动链路建立(ALE)技术是第三代短波通信(3G)中的一项关键技术,握手过程是自动链路建立技术的一项重要内容。该文分析了3G-ALE异步握手协议在非对称信道下的性能,在此基础上提出了非对称信道下“基于信道先验估计”握手协议,给出了采用此协议的系统建链概率表达式和平均建链时间表达式。在非对称信道下,对采用3G异步握手协议和“基于信道先验估计”握手协议的系统性能进行了仿真比较。结果表明,采用“基于信道先验估计”握手协议可大大提高系统的建链效率。
Automatic link establishment (ALE) technology is one of the key technologies in the third generation of shortwave communication (3G). The handshake process is an important part of automatic link establishment technology. This paper analyzes the performance of the 3G-ALE asynchronous handshake protocol under asymmetric channel, and proposes the handshake protocol based on the “channel prior estimate” under asymmetric channel, and gives the system chain building using this protocol Probability Expressions and Average Chain-Building Time Expressions. Under asymmetric channel, system performance comparison between 3G asynchronous handshake protocol and “channel based a priori estimate ” handshake protocol was simulated. The results show that the use of “channel-based a priori estimates ” handshake protocol can greatly improve the efficiency of the system building chain.