详细分析了PPM编码的帧结构，说明了脉冲编号的解码方案以及电路的实现原理，最终给出电路的仿真测试结果。

The paper analyzes frame architecture of PPM code in detail, illustrates pulse-number method and implementation principle of the circuit, and supplies test result of the circuit.

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详细分析了短消息的PDU组帧格式。

The paper presents the PDU frame of short message in detail.

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然后采用了协议的分层设计概念，根据协议要求制定了帧格式，详细分析并设计了物理层、数据链路层和协议工作流程等。

Then I introduce the concepts about level design and make the frame structure of the Proximity link protocol. I also analyze the physical layer, data link layer and the progress of the protocol, etc.

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