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无线Ad hoc网络中,干扰产生于接收节点处的接收信号被其他无用信号叠加,干扰问题严重影响接收端解码信息的能力,导致数据包冲突和重传的增加。如何最小化链路干扰,减少数据包冲突概率,是提高网络性能的关键。MAC协议中,合理的载波监听机制是减小链路干扰的有效方式之一,通过合适的感知门限设计,可以有效地降低链路中的干扰和冲突,提高网络吞吐量。文章提出一种最小化链路干扰的载波监听机制,该机制根据链路的实际状况对接收节点的干扰范围进行计算,进而使得发送节点调节合适的感知门限值,使发送节点可以感知到所有干扰节点,进而最小化链路干扰。模拟结果显示,本文提出的机制能有效地提高网络吞吐量,最小化数据包冲突概率和链路中存在的干扰。
In wireless Ad hoc networks, the received signals generated by the interference at the receiving node are superposed by other unwanted signals. The interference problem seriously affects the ability of the receiving end to decode the information, leading to the increase of packet collision and retransmission. How to minimize link interference and reduce packet collision probability is the key to improve network performance. In the MAC protocol, a reasonable carrier sense mechanism is one of the effective ways to reduce the link interference. Through the appropriate perceptual threshold design, the interference and collision in the link can be effectively reduced and the network throughput can be increased. This paper proposes a carrier monitoring mechanism to minimize the link interference. The mechanism calculates the interference range of the receiving node according to the actual condition of the link, so that the sending node adjusts the appropriate sensing threshold so that the sending node can perceive all Interfere with the node, and then minimize the link interference. The simulation results show that the proposed mechanism can effectively improve network throughput, minimize packet collision probability and link interference.