延世大学

智能手机新兴技术

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Course 1 of 6 in the Specialization Emerging Technologies: From Smartphones to IoT to Big Data

智能手机是我们日常生活中使用的最有影响力的设备之一。智能手机是存在在这个世界上，最先进的硬件和软件技术结合成一个神奇,简单使用的便携式系统。这些讲座的重点在规格，硬件模块，和OS（操作系统）的iOS和Android智能手机，它可执行不同的特性和功能。由于有这么多的智能手机类型，在讲座中，将选择和比较三个智能手机。讲座涵盖了三星Galaxy S6边缘，规格LG G4，和iPhone 6 plus，这些是最近发布在世界上最流行的的智能手机！通过认识蜂窝网络， Wi-Fi、蓝牙、网络、OS（操作系统），芯片组，CPU（中央处理单元），GPU（图形处理单元）、显示、定位和导航系统，以及新的无线充电系统的新知识，你将能够分析、设计和规划未来的新智能手机。

From the lesson

Smartphone Specifications

These lectures provide more details on some of the most essential smartphone system components that are used in the Samsung Galaxy S6 edge, LG G4, and the iPhone 6 plus. The lectures cover the specifications of GPS (Global Positioning System), A-GPS (Assisted GPS), DLNA (Digital Living Network Alliance), RDS (Radio Data System), Shatterproof Glass, Gorilla Glass, Oleophobic Coating, Super AMOLED (Active-Matrix Organic Light-Emitting Diode), IPS (In-Plane Switching), LED-Backlit LCD Display, Qi wireless charging, WPC (Wireless Power Consortium), and PMA (Power Matters Alliance).

Smartphone Specs Part 111:22

Smartphone Specs Part 23:45

Smartphone Specs Part 37:28

Meet the Instructors

Jong-Moon Chung
Professor, School of Electrical & Electronic Engineering
Director, Communications & Networking Laboratory

Now let's look at GPS, Global Positioning System.

This was created by the US Army in 1978.

A GPS device communicates with 4 or

more satellites to determine its exact location.

The location coordinates that are provided are longitude and latitude.

Then there's A-GPS, assisted GPS.

And this uses information from GPS satellites by using

position information from the mobile network assistant servers.

It works the same way as GPS,

as it provides location coordinates of longitude and latitude.

Accurate time information of the mobile communication network can be used.

The Assisted GPS, A-GPS assistance types are typically divided into two.

There is the MSB, Mobile Station Based, and the MSA, the Mobile Station Assisted.

Now, in MSB the mobile station helps in acquiring

the GPS satellite information quickly.

But in MSA the mobile station assisted version.

The mobile servers helps the actual the calculation of the position

by using GPS receiver signal information.

If we were to look at the differences a little bit more in detail,

it would look like this.

The signal information, well for A-GPS,

GPS satellite signals and assistance servers are used.

In GPS, GPS satellite signals are used only.

For speed, A-GPS may provide faster location

coordinate information, because it uses connectivity with cellular base stations.

GPS, the initial speed of finding out the location

may take several minutes to determine.

Because it requires connectivity with 4 or more satellites, for a certain duration

of time before the computation of the location coordinates are completed.

Then we compare reliability where A-GPS could be slightly less accurate than GPS.

GPS can achieve a within 1 meter accuracy if

sufficient GPS signals are able to be detected.

Next, cost wise, well, GPS does not require any cost, but

for A-GPS, cost of the mobile network needs to be paid.

Then we compare A-GPS and GPS on how it's used.

Well, GPS is used for cars, planes, ships and

boats, in position locationing and also in navigation systems.

A-GPS is used by mobile phones because it relies on the mobile network signal.

Now, we look at the other features that were on the smart phone.

That includes GLONASS which is the Global Navigation Satellite System.

This is a satellite navigation system for vehicle and aviation navigation,

it's operated by the Russian Aerospace Defense Force.

And then there's BeiDou which is a navigation satellite system,

it's a second generation satellite navigation system of China.

These are the references that I used for smartphones and

I recommend them to you if you're interested in studying further.

Thank you.