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<h1>Wi-Fi HaLow的真相 1111</h1>
<div class="subhead" style="padding-bottom:15px;padding-right:50px;font-size:16px;color:#252525;font-style:normal;text-align:center;">—— Wi-Fi HaLow的真相</div>
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<span>时间：2024-08-29</span>
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<span id="contentlabels" style="font-size:14px;"><p style="text-align: left;">了解<a class="contentlabel" href="https://www.eepw.com.cn/news/listbylabel/label/Wi-Fi HaLow"><em>Wi-Fi HaLow</em></a>，一种用于<a class="contentlabel" href="https://www.eepw.com.cn/news/listbylabel/label/物联网"><em>物联网</em></a>应用的远距离、低功耗无线标准。</p>本文引用地址：<a href="https://www.eepw.com.cn/article/202408/462473.htm">https://www.eepw.com.cn/article/202408/462473.htm</a><p style="text-align: left;"><a class="contentlabel" href="https://www.eepw.com.cn/news/listbylabel/label/IEEE802.11ah"><em>IEEE802.11ah</em></a>，更为人熟知的名字是<a class="contentlabel" href="https://www.eepw.com.cn/news/listbylabel/label/Wi-Fi HaLow"><em>Wi-Fi HaLow</em></a>，是一种专门为满足<a class="contentlabel" href="https://www.eepw.com.cn/news/listbylabel/label/物联网"><em>物联网</em></a>（IoT）设备需求而设计的无线通信标准。该标准于2016年推出，多年来一直相对鲜为人知。然而，智能设备市场的不断增长导致人们对这种以<a class="contentlabel" href="https://www.eepw.com.cn/news/listbylabel/label/物联网"><em>物联网</em></a>为中心的无线技术重新产生了兴趣。</p><p style="text-align: left;">当然，说<a class="contentlabel" href="https://www.eepw.com.cn/news/listbylabel/label/Wi-Fi HaLow"><em>Wi-Fi HaLow</em></a>是“专为物联网需求而设计的”很容易。我们真正需要知道的是，它如何以及在多大程度上满足了这些需求。在本文中，我们将介绍Wi-Fi HaLow的基础知识，以及它与其他无线选项的比较。最后，我们将回顾一些Wi-Fi HaLow可能非常适合的实际应用。</p><p style="text-align: left;">首先，图1提供了Wi-Fi HaLow功能和优势的快速列表。</p><p style="text-align: left;">Wi-Fi HaLow功能和优势概述。</p><p style="text-align: left;"> </p><p style="text-align:center"><img src="http://editerupload.eepw.com.cn/202408/1724914694677332.png" title="1724914694677332.png" alt="1.png"/></p><p style="text-align: center;">图1 Wi-Fi HaLow 及其优势概览。图片由 Wi-Fi Alliance 提供</p><p>除了上述功能外，值得注意的是，一个Wi-Fi HaLow接入点一次最多可连接8191台设备。至于列表中的项目，其中一些（例如使用Wi-Fi安全）可以应用于任何Wi-Fi认证产品。我们将忽略这些项目，转而讨论Wi-Fi HaLow的独特之处，从其工作频率开始。</p><p>Wi-Fi HaLow与传统Wi-Fi：工作频率</p><p>根据具体标准，传统Wi-Fi的工作频率范围在2 GHz到6 GHz之间。相比之下，Wi-Fi HaLow的工作频率在1 GHz以下。确切的频率范围因国家而异——在美国，频率范围在902 MHz到928 MHz之间。</p><p>与高频操作相比，在1 GHz以下操作具有以下优点：</p><p>一个不那么拥挤的频谱。</p><p>最大传输距离更大。</p><p>信号穿透性更好。</p><p>降低功耗。</p><p>该频段的缺点是限制了带宽，这也意味着数据速率有限。Wi-Fi HaLow 的数据吞吐量确实比 LoRaWan 高，我们将在下一节中看到。尽管如此，它可能更适合作为传统 Wi-Fi 网络的补充，而不是替代品。Wi-Fi HaLow 和其他 Wi-Fi 类型之间的频率差异降低了它们并排使用时发生干扰的风险。</p><p>Wi-Fi HaLow与LoRaWAN：范围和数据速率</p><p>理论上，LoRaWan可以覆盖数百公里的距离。实际上，它用于覆盖约5公里的距离。Wi-Fi HaLow的设计工作范围为1公里，但可以通过以网状配置部署网络来进一步扩大覆盖范围。即使考虑到这一点，LoRaWAN仍然具有更大的范围。</p><p>另一方面，Wi-Fi HaLow 代表了速度的大幅提升。LoRaWAN 的工作范围从 250 bps 到 22 Kbps。如图 2 所示，Wi-Fi HaLow 的数据吞吐量范围从长距离的 150 Kbps 到短距离的 78 Mbps。请注意，这些数字假设了单个空间流——Wi-Fi HaLow 最多可以使用四个空间流。</p><p>Wi-Fi HaLow和其他物联网通信标准的数据速率与距离。</p><p style="text-align: center;"> <img src="http://editerupload.eepw.com.cn/202408/1724914690494966.png" title="1724914690494966.png" alt="2.png"/></p><p style="text-align: center;">图2:Wi-Fi HaLow和其他物联网通信标准的数据速率与距离。图片由Wi-Fi联盟提供</p><p>数据速率的差异对潜在应用产生了影响：与LoRaWAN不同，Wi-Fi HaLow可用于传输视频。它通常在无线安全摄像头的背景下进行讨论。</p><p>数据速率和调制</p><p>前两节将Wi-Fi HaLow与其他无线技术进行了比较。现在，让我们从更详细地了解数据吞吐量开始，根据其自身的优点来对其进行检查。</p><p>Wi-Fi HaLow使用以下类型的数据调制：</p><p>二进制和正交相移键控（BPSK和QPSK）。</p><p>16、64和256正交幅度调制（QAM）。</p><p>Wi-Fi HaLow的调制和编码方案（MCS）索引包括总共11个选项。其中，MCS 0到MCS 8可以使用1 MHz、2 MHz、4 MHz、8 MHz或16 MHz的信道。MCS 9提供了最高的数据速率，适用于除2 MHz信道外的任何带宽。最后，MCS 10（代表最低数据速率和最大传输范围）仅适用于1 MHz信道。</p><p>需要理解的关键一点是，数据速率和最大传输距离之间存在权衡，数据速率和功耗之间也存在权衡。Wi-Fi HaLow 的数据速率和调制选项范围广泛，并且能够对其进行调整，使用户能够自定义这些权衡，以满足不同应用的需求。</p><p>电力消耗</p><p>对于电池供电的物联网设备，功耗是一个主要考虑因素。设备的无线连接消耗的功率越多，更换电池的频率就越高。这既是一个成本问题，也是一个可靠性问题——如果电池没电了，设备就无法传输，数据就会丢失。此外，必须不断前往传感器所在位置更换电池，这根本不是一件有趣的事情。</p><p>Wi-Fi HaLow旨在用于这些类型的设备，因此它试图降低功耗。它做得很好。我们在文章开头附近提到了一个原因——它的低工作频率。</p><p>然而，不仅仅是频段会产生影响。图3比较了五种不同的1GHz以下无线技术的设备电池寿命，包括Wi-Fi HaLow（<a class="contentlabel" href="https://www.eepw.com.cn/news/listbylabel/label/IEEE802.11ah"><em>IEEE802.11ah</em></a>）。此图来自IMEC关于该主题的研究报告，其幻灯片可在此处获得。</p><p>不同亚1 GHz无线技术的电池寿命比较。</p><p style="text-align: center;"> <img src="http://editerupload.eepw.com.cn/202408/1724914687660577.png" title="1724914687660577.png" alt="3.png"/></p><p style="text-align: center;">图3 不同低于1 GHz的无线技术的电池寿命比较。图片由Jeroen Famaey提供</p><p>如您所见，Wi-Fi HaLow提供了五个选项中最好的电池寿命。</p><p>Wi-Fi HaLow的多种节能模式有助于提高性能。这些模式减少了设备必须保持唤醒状态的时间，以避免被接入点丢弃并需要重新进行身份验证。有关Wi-Fi HaLow节能功能的详细信息，请参阅上一节中链接的Wi-Fi联盟白皮书。</p><p>Wi-Fi HaLow：它有什么好处？</p><p>至此，我们应该对Wi-Fi HaLow的优势有了相当的了解。概括来说，它提供了：</p><p>低功耗；延长连接设备的电池寿命。</p><p>中长距离数据传输。</p><p>数据吞吐量足够高，可以在相对较长的距离上传输视频。</p><p>根据应用要求调整数据速率的选项。</p><p>从一个接入点同时连接到具有不同需求的多个设备。</p><p>信号穿透力强，适用于节点之间无直接视线的网络。</p><p>在同一区域内，不会干扰高速Wi-Fi网络的运行频率。</p><p>那么，这如何转化为实际应用呢？我们在文章前面提到了远程安全摄像头，但Wi-Fi HaLow也有潜力用于智能建筑和智能农业。</p><p>工业建筑和农业设施都使用广泛的远程传感器和执行器网络。Wi-Fi HaLow提供了良好的可扩展性，传感器和执行器受益于其能效。同时，长距离和高信号穿透意味着与不仅远离接入点，而且被墙壁或密集植被隔开的节点有更好的连接。</p><p><br/></p></span>
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<span class="zz">| 2009-07-06</span>
<div style="clear: both"></div>
</div>
</div>
<div style="clear: both"></div>
</li>
</ul>
<ul class="xgwz">
<li class="dg1">
<a class="tp" href="https://diagram.eepw.com.cn/diagram/circuit/cid/27/cirid/11526" target="_blank"><img src="http://uphotos.eepw.com.cn/food/pics/1249032735_0.jpg" alt="多媒体Hi-Fi功放"></a>
<div class="yb">
<div class="younr">
<a href="https://diagram.eepw.com.cn/diagram/circuit/cid/27/cirid/11526" target="_blank">多媒体Hi-Fi功放</a>
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<div class="yx">
<a class="fl" href="https://diagram.eepw.com.cn/diagram/circuit/cid/27/cirid/11526" target="_blank">
设计方案 </a>
<a class="zz" target="_blank" href="https://diagram.eepw.com.cn/diagram/listbylabel/label/多媒体">多媒体</a>
<a class="zz" target="_blank" href="https://diagram.eepw.com.cn/diagram/listbylabel/label/Hi-Fi">Hi-Fi</a>
<a class="zz" target="_blank" href="https://diagram.eepw.com.cn/diagram/listbylabel/label/功放">功放</a>
<span class="zz">| 2009-07-31</span>
<div style="clear: both"></div>
</div>
</div>
<div style="clear: both"></div>
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</div>
<div class="yx">
<a class="fl" href="https://www.eepw.com.cn/info/industry/special/wireless" target="_blank">
手机与无线通信 </a>
<a class="zz" target="_blank" href="https://www.eepw.com.cn/news/listbylabel/label/恩智浦">恩智浦</a>
<a class="zz" target="_blank" href="https://www.eepw.com.cn/news/listbylabel/label/超宽带">超宽带</a>
<a class="zz" target="_blank" href="https://www.eepw.com.cn/news/listbylabel/label/安全测距">安全测距</a>
<a class="zz" target="_blank" href="https://www.eepw.com.cn/news/listbylabel/label/短程雷达">短程雷达</a>
<a class="zz" target="_blank" href="https://www.eepw.com.cn/news/listbylabel/label/自动化工业">自动化工业</a>
<a class="zz" target="_blank" href="https://www.eepw.com.cn/news/listbylabel/label/物联网">物联网</a>
<span class="zz">| 2024-09-12</span>
<div style="clear: both"></div>
</div>
</div>
<div style="clear: both"></div>
</li>
</ul>
<ul class="xgwz">
<li class="dg1">
<div class="yb-1">
<div class="younr-1">
<a href="https://share.eepw.com.cn/share/download/id/6115" target="_blank">HI-FI必读</a>
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</div>
<div class="yx">
<a class="fl" href="https://share.eepw.com.cn/share/download/id/6115" target="_blank">
资源下载 </a>
<a class="zz" target="_blank" href="https://share.eepw.com.cn/share/list/keyword/高保真 HI-FI">高保真 HI-FI</a>
<a class="zz" target="_blank" href="https://share.eepw.com.cn/share/list/keyword/音响">音响</a>
<a class="zz" target="_blank" href="https://share.eepw.com.cn/share/list/keyword/比较">比较</a>
<span class="zz">| 2007-02-16</span>
<div style="clear: both"></div>
</div>
</div>
<div style="clear: both"></div>
</li>
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<ul class="xgwz">
<li class="dg1">
<a class="tp" href="https://diagram.eepw.com.cn/diagram/circuit/cid/140/cirid/8647" target="_blank"><img src="http://uphotos.eepw.com.cn/fetch/08112/20088168322937977801.jpg" alt="USB音箱，新增加HI-FI级USB AUDIO PCB"></a>
<div class="yb">
<div class="younr">
<a href="https://diagram.eepw.com.cn/diagram/circuit/cid/140/cirid/8647" target="_blank">USB音箱，新增加HI-FI级USB AUDIO PCB</a>
</div>
<div class="yx">
<a class="fl" href="https://diagram.eepw.com.cn/diagram/circuit/cid/140/cirid/8647" target="_blank">
设计方案 </a>
<a class="zz" target="_blank" href="https://diagram.eepw.com.cn/diagram/listbylabel/label/音箱">音箱</a>
<a class="zz" target="_blank" href="https://diagram.eepw.com.cn/diagram/listbylabel/label/新增加">新增加</a>
<a class="zz" target="_blank" href="https://diagram.eepw.com.cn/diagram/listbylabel/label/增加">增加</a>
<a class="zz" target="_blank" href="https://diagram.eepw.com.cn/diagram/listbylabel/label/HI-FI">HI-FI</a>
<a class="zz" target="_blank" href="https://diagram.eepw.com.cn/diagram/listbylabel/label/AUDIO">AUDIO</a>
<span class="zz">| 2009-07-06</span>
<div style="clear: both"></div>
</div>
</div>
<div style="clear: both"></div>
</li>
</ul>
<ul class="xgwz">
<li class="dg1">
<div class="yb-1">
<div class="younr-1">
<a href="https://www.eepw.com.cn/article/202409/462961.htm" target="_blank">突破极限：摩尔斯微电子在美国约书亚树国家公园测试Wi-Fi HaLow </a>
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</div>
<div class="yx">
<a class="fl" href="https://www.eepw.com.cn/info/industry/special/wireless" target="_blank">
手机与无线通信 </a>
<a class="zz" target="_blank" href="https://www.eepw.com.cn/news/listbylabel/label/摩尔斯微电子">摩尔斯微电子</a>
<a class="zz" target="_blank" href="https://www.eepw.com.cn/news/listbylabel/label/Wi-Fi HaLow ">Wi-Fi HaLow </a>
<span class="zz">| 2024-09-13</span>
<div style="clear: both"></div>
</div>
</div>
<div style="clear: both"></div>
</li>
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<li class="dg1">
<a class="tp" href="http://v.eepw.com.cn/video/play/id/2334" target="_blank"><img src="http://editerupload.eepw.com.cn/201301/96e17628d04d7c663f96546b1501c4a2.jpg" alt="物联网的输电高压线路智能驱鸟系统"></a>
<div class="yb">
<div class="younr">
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<div class="yx">
<a class="fl" href="http://v.eepw.com.cn/video/play/id/2334" target="_blank">
视频 </a>
<a class="zz" target="_blank" href="http://v.eepw.com.cn/video/search/key/信息技术大赛">信息技术大赛</a>
<a class="zz" target="_blank" href="http://v.eepw.com.cn/video/search/key/单片机">单片机</a>
<a class="zz" target="_blank" href="http://v.eepw.com.cn/video/search/key/STC15F2K61S2">STC15F2K61S2</a>
<a class="zz" target="_blank" href="http://v.eepw.com.cn/video/search/key/物联网">物联网</a>
<a class="zz" target="_blank" href="http://v.eepw.com.cn/video/search/key/智能驱鸟">智能驱鸟</a>
<span class="zz">| 2013-01-04</span>
<div style="clear: both"></div>
</div>
</div>
<div style="clear: both"></div>
</li>
</ul>
<ul class="xgwz">
<li class="dg1">
<a class="tp" href="https://diagram.eepw.com.cn/diagram/circuit/cid/26/cirid/2175" target="_blank"><img src="http://uphotos.eepw.com.cn/fetch/0828/20088127384312577801.jpg" alt="Hi-Fi 前置放大器"></a>
<div class="yb">
<div class="younr">
<a href="https://diagram.eepw.com.cn/diagram/circuit/cid/26/cirid/2175" target="_blank">Hi-Fi 前置放大器</a>
</div>
<div class="yx">
<a class="fl" href="https://diagram.eepw.com.cn/diagram/circuit/cid/26/cirid/2175" target="_blank">
设计方案 </a>
<a class="zz" target="_blank" href="https://diagram.eepw.com.cn/diagram/listbylabel/label/Hi-Fi">Hi-Fi</a>
<a class="zz" target="_blank" href="https://diagram.eepw.com.cn/diagram/listbylabel/label/前置">前置</a>
<a class="zz" target="_blank" href="https://diagram.eepw.com.cn/diagram/listbylabel/label/放大器">放大器</a>
<span class="zz">| 2009-07-06</span>
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</div>
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