采用可穿戴圆极化天线的离体信道特性建模与分集接收方法

doi:10.11959/j.issn.2096-3750.2018.00051

摘要/Abstract

摘要：

提出了采用一对反旋向平面端射圆极化可穿戴天线进行分集的体域通信抗多径接收方法，其原理是利用平面端射圆极化天线的俯仰面宽波束特性克服身高变化带来的幅度衰落，并利用其圆极化特性改善来波极化失配引起的深度衰落。在5.8 GHz频段上设计了天线实物，然后测量体域传播特性并建立离体分集信道模型，进而研制了信道仿真器，并与线极化天线分集情况进行比较。实验与仿真结果表明，同等条件下圆极化分集的等增益合并功率电平比线极化分集平均提升2.1 dB，多径均方根时延扩展及多径数显著降低，系统传输误码率可降低一个数量级，充分验证了体域圆极化天线分集接收方法的正确性及有效性。

关键词: 平面端射圆极化天线, 可穿戴天线, 离体信道, 分集接收, 抗衰落

Abstract:

An anti-fading diversity receiving approach to body-area communications was proposed.A pair of opposite-sense called planar endfire circularly polarized antennas (PECPA) was employed to implement the receiving approach.The wide beamwidth CP characteristic of the PECPA was used to mitigate the height-dependent fadings.Antenna designs and body-area propagation measurements were performed at 5.8 GHz-band.An off-body channel model was established,and a channel simulator was accordingly developed.All results were compared to the cases using linearly polarized (LP) antennas diversity on equal conditions.The results show that the equal-gain-combination (EGC) signal levels for CP diversity reception are 2.1 dB greater than the LP one (with polarization mismatching loss removed).The rootmean-square delay spread (RDS) and number of multi-path component (MPC) can be significantly reduced.In addition,the simulated bit error rate (BER) of the body-area communication system using CP diversity can be improved by one order of magnitude compared the LP diversity one.The correctness and effectiveness of the proposed approach has been evidently validated by the experimental and simulated results.

Key words: planar endfire circularly polarized antenna (PECPA), wearable antenna, off-body channel, diversity reception,anti-fading

中图分类号:

TN820

吕文俊,崔鹏飞,朱洪波. 采用可穿戴圆极化天线的离体信道特性建模与分集接收方法[J]. 物联网学报, 2018, 2(2): 41-48.

Wenjun LYU,Pengfei CUI,Hongbo ZHU. Off-body channel modelling and diversity reception approach using wearable circularly polarized antenna[J]. Chinese Journal on Internet of Things, 2018, 2(2): 41-48.

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方案	特性	分布类型	位置参量	形状参量
	时延扩展	莱斯分布	S=7.02	δ=4.10
	多径数目	威布尔	λ=25.4	k=2.32
圆极化CP	相干带宽	对数正态	μ=3.37	δ=0.77
	信号强度	威布尔	λ=67.9	k=21.7
	平均时延	威布尔	λ=27.5	k=3.18
	时延扩展	莱斯分布	S=10.1	δ=5.93
	多径数目	威布尔	λ=27.8	k=2.45
线极化PIFA	相干带宽	对数正态	μ=3.25	δ=0.73
	信号强度	威布尔	λ=69.2	k=14.5
	平均时延	威布尔	λ=28.5	k=3.25
	时延扩展	莱斯分布	S=12.8	δ=4.36
	多径数目	威布尔	λ=31.8	k=2.65
线极化Patch	相干带宽	对数正态	μ=3.01	δ=0.64
	信号强度	威布尔	λ=73.9	k=23.0
	平均时延	威布尔	λ=29.9	k=3.27