距离范围中的Wi-Fi直工程 [英] range of distances in which Wi-Fi direct works
问题描述
我开发了基于Wi-Fi直连技术（P2P）的Android应用程序，所以我真的需要知道多少米的是Android的WiFi的范围内直接performance.based在Android API指南：
I'm developing an android app which is based on WiFi Direct technology(P2P), so I really need to know how many meters is the range of android WiFi direct performance.based on Android API Guides:
您可以发现并连接到其他设备时，每个设备支持Wi-Fi P2P，然后在传达迅速连接跨越的距离更长的时间比蓝牙连接。
you can discover and connect to other devices when each device supports Wi-Fi P2P, then communicate over a speedy connection across distances much longer than a Bluetooth connection.
但我们知道，是不够的我。因为我的目标，我需要的数字！我的意思是距离范围中的Wi-Fi P2P的工作原理。
but knowing that is not enough for me. because of my aim I need numbers! I mean a range of distances in which Wi-Fi P2P works.
推荐答案
的典型的Wi-Fi设备的扩展其信号的达100米。 来源
Typical Wi-Fi devices extend their signal up to 100 meters. Source
不过最大的的恐怖的无线网络连接是视距（LOS）可能急剧下降的范围。
However the biggest of horror of Wi-Fi is Line of Sight (LOS) which may drop your range dramatically.
这是因为在2.4GHz或5GHz频率的Wi-Fi信号。这些很容易被干扰障碍如家具，墙或甚至镜子（其金属层反射的信号）或者甚至吸收波水破坏。如果应用程序是要外大多使用，例如障碍物计数理应大大下降。
That's because Wi-Fi signals at 2.4GHz or 5GHz frequencies. These are easily disrupted by interfering obstacles such as furniture, walls or even mirrors (whose metallic layer reflects the signal) or even water that absorbs the waves. If the app is to be used mostly outside, such obstacle count is supposedly greatly decreased.
额外的：
Wi-Fi信号强度是由一种叫做衰减因素的影响。下面是一个 酷表 显示对信号的影响材料
Wi-Fi signal strength is influenced by a factor called attenuation. Here's a Cool Table displaying the materials influence on the signal.
您可能还需要记住的Android的Wi-Fi点对点（Wi-Fi直）仅因为API 14（4.0 ICS）。
虽然三星允许使用的Wi-Fi Direct的能力的 的连接，因为API 9（2.3姜饼）设备。结果
总之，你可能要考虑，如果用户是有没有，要使用这个标准。
You might also want to keep in mind that Android Wi-Fi P2P (Wi-Fi direct) is available only since API 14 (4.0 ICS).
Though Samsung allowed using the Wi-Fi Direct ability to connect to devices since API 9 (2.3 Gingerbread).
Anyhow you might want to think if users are "there yet", to be using this standard.
我也喜欢这个视频银河S3和iPhone 5的连接比作GoPro的英雄3相机。他所达到的最大射程为100码（〜90米）具有完善的服务水平。
I also liked this Video comparing Galaxy S3 and iPhone 5 connectivity to a GoPro Hero 3 Camera. The maximum range he reached was 100 yards (~90 meters) with perfect LOS.
编辑：
天线，理论一个完全致力于天线的状态网站：
Antenna-Theory a website dedicated completely to antenna's states that:
Wi-Fi天线效率为手持移动设备通常是
在-6 dB的顺序为-2分贝
Wi-Fi Antenna Efficiencies for handheld mobile devices are typically on the order of -6 dB to -2 dB
虽然各种在线消息人士指出，一般的笔记本电脑天线效率是从的 -3dB比3dB ，这是没有那么多手机不同。
While various online sources note that average laptop antenna efficiency is from -3dB to 3dB, which is not that much different from the cell phone.
您不能真正弄清楚实际的数字的，因为它一切真的取决于在环境在目标的天线和用户天线
You can't really figure out the actual numbers as it all really depends on the surroundings, the target's antenna and the users antenna.
不过手机往往有较低的范围比笔记本电脑和它可能的 50-80米清晰视线的。
Still phones tend to have lower range than that of the laptops and it's probably between 50-80 meters in clear sight.
很抱歉，但因为我不是物理学家或技术人员，和你问什么，我无法提供更准确的信息是pretty摘要：）
Sorry but I can't provide more accurate information as i'm no physicist or a technician, and what you're asking for is pretty abstract :)
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