Differential Overlap Decoding: Combating hidden terminals in OFDM systems
Differential Overlap Decoding: Combating hidden terminals in OFDM systems
复制标题
差分重叠解码：对抗 OFDM 系统中的隐藏终端
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
Cheng Zhi
中科院分区：
文献类型：
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作者：
Jingye Cao;Feng Yang;Lianghui Ding;Liang Qian;Cheng Zhi
本文提出了一种差分重叠解码（DOD）算法来解决基于OFDM的无线局域网系统中的隐藏终端问题。国防部利用无线局域网的重传和随机抖动特性，对冲突数据包进行整体解码。国防部提出了新的方法和观点，以联合分离和解码基于OFDM系统中的冲突数据包。在DOD中，我们将IFFT/FFT、信道影响和数据包碰撞表示为线性过程。因此，我们可以表示为线性方程组的接收冲突的数据包，并简化为解决线性方程组的问题。通过仿真对DOD的性能进行了评估，结果表明，当DOD被应用时，隐藏终端问题可以被看作是3-5 dB的BER性能下降，而不是网络竞争。
In this paper, we propose a Differential Overlap Decoding (DOD) algorithm to solve the hidden-terminal problems in OFDM based WLAN systems. DOD exploits the retransmission and random-jitter features of WLAN to decode the collided packets as a whole. DOD provides with new methods and views to jointly separate and decode collided packets in OFDM based system. In DOD, we formulate IFFT/FFT, channel influence and packet collision as linear processes. Thus we can express the received collided packets as linear equations, and simplify this problem into solving linear equations. We evaluate the performance of DOD through simulation, and results show that when DOD is applied, hidden-terminal problems can be viewed as a 3-5 dB BER performance degradation rather than network contention.