一种漫射激光通信码速率的自适应确定方法

An Adaptive Method to Determine Chip Rate in Laser Communications Based on Diffuse

针对封闭空间内的激光漫射通信,提出一种码速率的自适应确定方法。与传统的自由空间激光通信技术相比,该方法在通信的开始阶段增加了一个码速率测试环节,在这一环节中,设备1和设备2采用固定的低码速率通信,设备1向设备2发送一组"1"和"0"交替出现的测试数据。利用接收数据可以计算出信号"1"的持续时间以及当前环境中合适的通信码速率。设备2将该码速率传给设备1后,两设备将利用新的码速率通信。该方法的特点之一是既不会因激光漫射的延迟导致通信误码,也不会因码速率太低而浪费通信资源;该方法的特点之二是应用过程中不必考虑具体的通信环境,码速率可以由软件自动获得。

An adaptive method to determine chip rate is proposed for laser communications based on diffuse in a close space.Compared with conventional laser communications in free space,the method adds a test process of chip rate in the beginning phase of communication.In the process,equipment 1 and equipment 2 communicate using fixed low chip rate,and a series of test data composed of alternant appearance of signal ＂1＂ and signal ＂0＂ is transmitted from equipment 1 to equipment 2.In virtue of the accepted data in equipment 2,the persistence time of signal ＂1＂ and appropriate chip rate of communication in existing circumstances can be calculated.After equipment 2 transmits the chip rate to equipment 1,the two equipments will communicate using the new chip rate.There are two merits about the laser diffuse communication system using the aforesaid chip rate.The first is neither resulting in errors due to delay of laser diffuse nor wasting communication resource due to low chip rate,and the second is that communication circumstance needs not to be considered nor the chip rate can be obtained automatically by software.