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1·In this paper, a method used to amplify faint direct current signal is put forward, and the circuits of direct current amplifier to realize the method are devised.

本文提出一种放大微弱直流信号的方法，同时设计了实现这一方法的直流放大器电路。

2·Then the choosing method of the probe of electric field and the designing of the amplify and A/D circuit is put forward. The interface of communication is also put forward in this paper.

然后分别从水下电场探头的选择，电场测量放大电路与A/D转换电路的设计，通讯接口设计等方面阐述了该仪器的研制思路。

3·Simulation results indicate if the spectral efficiency is less than some certain value, the performance of amplify-forward and network coding forward are much better than that of direct transmission.

仿真实验得到：频谱效率小于一定值的情况下，利用放大和网络编码转发方式的性能大大高于直接传输方式。

4·The structure of the optimum receivers for amplify-and-forward and process-and-forward schemes and their systems 'performance are studied in this paper.

采用放大前传和处理前传两种协同策略，研究在不同协同策略情况下的最大接收机机构和系统性能。