如果找到的路由不是纯双向链路，则源节点还需要将RACK报文沿找到的回路路由循环一次，通过RACK的传播来通知中间节点建立起相应的路由。
If it is not a pure two-way path which includes some asymmetric links, the source needs to spread the RACK along the route and inform the route-related nodes to establish the corresponding route.
第二章分别针对核心网版本选择、覆盖区域、传播模型、链路预算、容量规划、干扰分析、站址设置原则等无线网络规划的主要专题进行了专项研究。
Chapter 2 makes special studying on choice of core network version, covering area, transmission model, link budget, capacity planning, interference analysis, and site setting principle etc.
为了克服由多径传播造成的相移失真难题(特别是在HF链路里)，调制采用差分相移键控(DPSK)来完成。
To cope with the problem of phase shifts caused by different propagation paths (especially in HF links), the modulation is done in differential phase shift keying (DPSK).
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