Wi-Fi 6e挑战:用超循环过滤弥合5 GHz和6 GHz之间的(小)间隙

经过Josh Schmelzle,,,,Technical Marketing Engineer
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Wi-Fi 6erepresents the most significant expansion of spectrum for unlicensed use to date – adding the 6 GHz band and remarkably increasing Wi-Fi capacity. However, a challenge withWi-Fi 6e是6 GHz和5 GHz频段紧接(相距仅50 MHz)。传统的过滤技术不能充分分开两个频段,因为设计需要更大的差距,并且在部署6 GHz时使用旧技术将需要在灵活性方面进行一些权衡。

Wi-Fi 6e挑战:5 GHz至6 GHz过滤

传统的带通滤波器不足,因为它们太粗糙,可以阻止EMEA的6个GHz通道中的1/3,北美的6 GHz通道中有10%。显然,射频过滤技术必须变得更加细粒度和动态,以有效地减轻干扰问题并最大程度地利用渠道。

这篇文章回顾了什么是带通滤波器。我将介绍Aruba接入点中发现的两个现有示例。最后,我将介绍Aruba创新的新带通滤波技术:Ultra Band(UTB)。另外,您还可以探索我们最新的Wi-Fi 6e AP,650系列校园访问点,,,,that we announced today.

什么是带通滤波器?

Bandpass filters are purpose-built devices placed in line between the antenna and radio. Their purpose is to allow specific frequencies while rejecting other unwanted signals.

为了形象化,幽默我,想一想两个固体墙之间的开口。想象一下,一波朝向这些墙壁的方向前进。除非有开口,否则大多数水不会在撞击时穿过。这就是带通滤波器的作用。如果信号频率太高或太低,则信号不会通过。

带通滤波器具有另一个关键角色。当收音机发送变速箱时,噪声底会上升。在另一个频段上的同一访问点内的无线电必须过滤接收信号。如果没有,则性能可能会受到负面影响。

Some history: Existing Aruba filtering techniques

有两个现有的过滤中欧的例子iques, used in Aruba access points, that prevent adjacent-band and in-band interference. These are not for 6 GHz, but for the 2.4 GHz radios.

Advanced IoT Coexistence (AIC) allows both Wi-Fi and IoT radios to concurrently operate in the 2.4 GHz band. AIC uses filtering to prevent overlapping interference from Wi-Fi entering the IoT radio. The Internet of Things (IoT) radio provides integrated operation and functionality for BLE or Zigbee.

晚期蜂窝共存(ACC)从上方和下方的2.4 GHz Wi-Fi频段过滤了信号。这可以防止在附近安装时对接入点的小单元干扰。因此,ACC可保护Wi-Fi免受细胞分布天线系统引起的干扰。

传统的过滤折衷方案用6 GHz

在同一访问点中共同定位的6 GHz和5 GHz无线电将传统带通滤波器的应用超出其拒绝不必要的噪声的能力。从U-NII-4(由5 GHz无线电服务)到U-NII-5(由6 GHz无线电提供)的频段之间的频率差距太小,在约50 MHz宽。

在5 GHz和6 GHz之间只有50 MHz的分离导致干扰

问题是传统的带通滤波器需要在频道之间的差距约200 MHz。没有足够的间隙,过滤器将无法阻止其他频段中的通道不需要的能量。另外,这些传统的带通滤波器还不够陡峭。如果它们在两个频段上都使用,则需要在某个地方进行频道限制。

传统过滤器逐渐脱落,并限制5 GHz和6 GHz的频道使用情况

在两个乐队上限制频道没有意义。为什么要在两个乐队中牺牲频道?传统带通滤波器的一种选择是将过滤器高转移,从而限制了低6 GHz通道的使用。在不同制造商的其他能力的访问点中发现的某些实现是高高,固定且不可配置的。

One option with traditional filters is to restrict 6 GHz channels and provide full use of the 5 GHz band but this significantly limits the capacity of the 6 GHz band.

放弃在给定的接入点上使用这些较低的6 GHz通道的灵活性,这并不理想。尤其是考虑不允许6 GHz频带的整个1200 MHz的调节域。例如,in regions where only the lower 500 MHz is allowed (i.e., European Union), giving up the bottom eight 20 MHz channels means not using a third of the 6 GHz band.

Using traditional filters and only restricting the 6 GHz band translates into cutting off one-third of the channels in the European model.

Aruba’s innovative approach: Ultra tri-band filtering

Aruba通过专利待处理技术解决了这些相邻的多频带过滤挑战:Ultra-Tri频段过滤(UTB)。

它是如何工作的?Ultra-Tri带过滤结合了硬件和软件,以在5 GHz和6 GHz上动态应用带通滤波器。这允许选择同一访问点上任何可用频道的频道选择。

框图显示UTB的高级体系结构

This means Aruba’s Wi-Fi 6E APs with ultra tri-band filtering can operate, maximize performance (range and throughput), and provide simultaneous service – without interference – on closely adjacent channels between bands including the lowest available 6 GHz channel and highest available 5 GHz channel.

Ultra tri-band filtering allows you to take advantage of all the new channels available in the 6 GHz band to support growing demands due to more devices, more cloud, services and accelerated digital transformation initiatives.

Explore Wi-Fi 6E and ultra tri-band filtering

Footnotes

  1. U-NII-4 will be enabled via software upgrade on compatible hardware in an upcoming software release. Stay tuned for more later this year.
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