WLAN and Ad hoc networks are widely applied in different fields, but the limited frequency bandwidth will induce the inter-system and intra-system interference , and reduce the performance of network.
WLAN和自组织网具有广泛的应用前景。但有限的频率带宽会导致系统间或者系统内的相互干扰，降低网络性能。
However, as bandwidth and transmission power are limited and the uncertain paths in wireless networks, delays, packet dropouts and errors are more likely to take place.
然而，由于无线网络的带宽相对较小、传输功率有限、路径不唯一，使得延时、丢包、出错等网络现象更为明显。
Limited bandwidth recourses lead to a number of challenges especially for video communication over Internet Protocol (IP) networks.
带宽资源的有限性对于IP网络上的视频通信提出了一系列的挑战。
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