Abstract: There are several shortcomings of existing wireless channel contention mechanisms,and the conflict is high and the required time is long.As a result,the coordination efficiency is quite low.This paper proposes a Parallel Frequency Domain Competition(PFC) mechanism.By utilizing orthogonal frequency division multiplexing to provide a large number of sub-carriers,the channel contention can be completed in the frequency domain.A node carrying with multiple antennas can declare its own transmission needs and priorities in the same time slot when it listens for the behaviors of other nodes.Simulation results show that compared with IEEE 802.11,when there is no synchronization error,the collision probability is less than 1% and the contention time is reduced by 50%~80%.When there is hidden terminal or synchronization error,the throughput of the proposed mechanism is increased by 10%~80%.

Key words: wireless network, parallel competition, frequency domain competition, Orthogonal Frequency Division Multiplexing(OFDM), multiple antenna

摘要： 现有信道竞争方法在信道资源竞争时存在冲突率高、竞争时间长等缺点,且协调效率较低。为此,提出一种新的并行频域竞争机制。通过利用正交频分复用提供的大量子载波,使信道竞争在频域中完成,为节点配备多根天线,在同一个时隙内声明自身的传输需求与优先级,并 侦听其他节点的行为,以此完成并行化竞争。仿真结果表明,与IEEE 802.11协议相比,当无同步误差时,该机制的冲突概率低于1%,竞争时间减少50%~80%,当存在隐含终端或同步误差时,该机制的吞吐量可提高10%~80%。

关键词: 无线网络, 并行竞争, 频域竞争, 正交频分复用, 多天线

CLC Number: 

• TP193