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Hybrid DCF Supporting Smart Antennas in WLANs

机译:WLAN中支持智能天线的混合DCF

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摘要

Hybrid distributed coordination function (H-DCF), a modified MAC protocol of IEEE 802.11, is proposed in this paper to support hybrid antennas, I.e., smart adaptive array antennas and omni-directional antennas in one WLAN. Smart antennas follow directional DCF (D-DCF) and omni-diretional antennas follow DCF. In D-DCF, before sending any data-frames, the sender and receiver node transmit its pilot sequence respectively by means of omni-directional RTS/CTS handshake mechanism. Based on the pilot, the directional beam can be formed by the smart antenna. Then the sender can transmit its data-frame in the directional mode. Based on virtual carrier sense mechanism, the omni-directional transmission between the sender and receiver cannot interfere with the other nodes. When the sender and receiver communicate in the directional mode, the other nodes can contend the channel to send their data-frames. Hence, D-DCF supports space division multiplexing. Moreover, D-DCF supports service differentiation. Smart antennas have a higher priority to access channel than omni-directional antennas by differentiating the contention parameters, such as arbitrary interframe space, initial contention window size, the maximum backoff stage and retry limit. Simulation results show that II-DCF can support hybrid antenna system effectively and provide much higher network throughput, lower delay and jitter than DCF does.
机译:本文提出了一种混合分布式协调功能(H-DCF),它是IEEE 802.11的一种改进的MAC协议,可在一个WLAN中支持混合天线,即智能自适应阵列天线和全向天线。智能天线遵循定向DCF(D-DCF),全向天线遵循DCF。在D-DCF中,在发送任何数据帧之前,发送方和接收方节点将通过全向RTS / CTS握手机制分别发送其导频序列。基于导频,定向波束可以由智能天线形成。然后,发送方可以在定向模式下发送其数据帧。基于虚拟载波侦听机制,发送方和接收方之间的全方位传输不会干扰其他节点。当发送方和接收方以定向模式进行通信时,其他节点可以竞争该通道以发送其数据帧。因此,D-DCF支持空分复用。此外,D-DCF支持服务差异化。通过区分竞争参数(例如任意帧间间隔,初始竞争窗口大小,最大退避级和重试限制),智能天线比全向天线具有更高的接入信道优先级。仿真结果表明,与DCF相比,II-DCF可以有效地支持混合天线系统,并提供更高的网络吞吐量,更低的延迟和抖动。

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