Download miễn phí Ứng dụng các DSP khả trình trong 3G
LỜI NÓI ĐẦU

Thông tin di động ngày nay đã trở thành một ngành công nghiệp viễn thông phát triển nhanh và mang lại nhiều lợi nhuận nhất cho các nhà khai thác. Sự phát triển của thị trường viễn thông di động đã thúc đẩy mạnh mẽ việc nghiên cứu và triển khai các hệ thống thông tin di động mới trong tương lai. Hệ thống di động thế hệ hai, với GSM và CDMA là những ví dụ điển hình đã phát triển mạnh mẽ ở nhiều quốc gia. Tuy nhiên, thị trường viễn thông càng mở rộng càng thể hiện rõ những hạn chế về dung lượng và băng thông của các hệ thống thông tin di động thế hệ hai. Sự ra đời của hệ thống di động thế hệ ba là một tất yếu, theo hướng cung cấp các dịch vụ đa phương tiện nhằm đáp ứng nhu cầu ngày càng tăng và đa dạng của người sử dụng.
Đồ án “Ứng dụng các DSP khả trình trong 3G” trình bày những ứng dụng của các DSP khả trình trong việc thiết kế các thành phần căn bản của hệ thống 3G. Sự hỗ trợ của các DSP khả trình đối với việc tăng khả năng xử lý, tốc độ xử lý, dung lượng hệ thống, hiệu suất làm việc của hệ thống 3G. Qua đó thấy được ứng dụng và tầm quan trọng của các DSP khả trình trong việc thiết kế hệ thống thông tin di động.

Bố cục của đồ án gồm 4 chương:
- Chương 1: Tổng quan về hệ thống thông tin di động 3G.
- Chương 2: Các DSP khả trình trong các máy cầm tay hai chế độ (2G và 3 G).
- Chương 3: Các DSP khả trình trong các modem trạm gốc 3G.
- Chương 4: Sử dụng DSP khả trình trong xử lý dàn anten.
DSP được sử dụng rộng rãi trong rất nhiều lĩnh vực của khoa học, công nghệ điện tử, tin học và đời sống. Ứng dụng của DSP trong hệ thống thông tin di động thì không phải là mới mẻ, nhưng việc tìm hiểu về ứng dụng của các DSP khả trình trong 3G là vấn đề khá mới ở Việt Nam, đòi hỏi phải có kiến thức sâu rộng về hệ thống 3G và xử lý tín hiệu số. Vì vậy trong khuôn khổ đồ án chắc chắn không tránh khỏi những sai sót cũng như còn nhiều vấn đề chưa được giải quyết thoả đáng. Em rất mong nhận được sự chỉ bảo của các thầy cô giáo, sự góp ý và phê bình của các bạn.

Trong thời gian thực tập và hoàn thành đồ án em đã nhận được sự giúp đỡ tận tình của thầy giáo TS. Nguyễn Phạm Anh Dũng, sự chỉ bảo ân cần của các thầy cô giáo trong khoa Viễn thông. Em xin chân thành cảm ơn!

http://s1.luanvan.co/qYjQuXJz1boKCeiU9qAb3in9SJBEGxos/swf/2013/06/23/ung_dung_cac_dsp_kha_trinh_trong_3g.5dHzrxLWwm.swf luanvanco /luan-van/de-tai-ung-dung-tren-liketly-30344/
Để tải bản Đầy Đủ của tài liệu, xin Trả lời bài viết này, Mods sẽ gửi Link download cho bạn sớm nhất qua hòm tin nhắn.
Ai cần download tài liệu gì mà không tìm thấy ở đây, thì đăng yêu cầu down tại đây nhé:
Nhận download tài liệu miễn phí

Tóm tắt nội dung tài liệu:

1Introduction
Edgar Auslander and Alan Gatherer
This book is about two technologies that have had, and will increasingly have, a significant
impact on the way we all live, learn and play: personal wireless communications and signal
processing. When it comes to both markets, history has shown that reality has often surprised
the most optimistic forecasters.
We draw on the experience of experts from MIT, Berkeley, UCLA, Worcester Polytechnic
Institute, INRIA, Authentec, Radioscape, Geovector and Texas Instruments, to give a
description of some of the important building blocks and implementation choices that
combine both technologies, in the past and in the future. We highlight different perspectives,
especially regarding implementation issues, in the processing of speech, audio, video, future
multimedia and location-based services as well as mobile commerce and security aspects.
The book is roughly divided into three sections:
† Chapters describing applications and their implementations on what might be described as
‘‘today’s’’ technology. By this, we mean the use of programmable Digital Signal Proces-
sors (DSPs) and ASICs in the manner in which they are being used for today’s designs. In
these chapters, we highlight the applications and the role of programmable DSPs in the
implementation.
† Chapters that present challenges to the current design flow, describing new ways of
achieving the desired degree of flexibility in a design by means other than programmable
DSPs. Whether these new approaches will unseat the programmable DSP from its perch
remains to be seen, as the commercial value of these approaches is less certain. But they
give a detailed overview of the directions researchers are taking to leap beyond the
performance curve of the programmable DSP approach.
† We conclude with a practical yet innovative application example, a possible flavor of the
exciting new personal communications services enabled by digital signal processing.
In this introduction, we overview the aspects of mobile communications that make it a
unique technology. We describe how the applications associated with mobile communica-
tions have evolved from the simple phone call into a slew of personal technologies. These
technologies, and their implementation, are described in more detail in the subsequent chap-
ters.
The Application of Programmable DSPs in Mobile Communications
Edited by Alan Gatherer and Edgar Auslander
Copyright q 2002 John Wiley & Sons Ltd
ISBNs: 0-471-48643-4 (Hardback); 0-470-84590-2 (Electronic)
1.1 It’s a Personal Matter
The social impacts and benefits of personal wireless communications are already visible.
When phones were not portable and used to only sit on a desk at home or at work, people
would call places: work or home; but when phones became portable and accessible anywhere,
people began to call people rather than places: today, when we call people we even often start
by asking ‘‘Hello, where are you?’’. The mobile phone has become a safety tool: ‘‘I will bring
the phone with me in case I need to call for an emergency, if anxious family members want to
reach me, or if I am lost’’. The mobile phone has become a social tool, enabling more flexible
personal life planning: ‘‘I do not know where I will be at 2 p.m. and where you will be, but I
will call you on your mobile and we will sync’’. A recent survey has shown that when people
forget their mobile phone at home, a vast majority is willing to go back home to get it, even
when it implies a 30-minute drive. The mobile phone has become a personal item you carry
with you like your wallet, your drivers’ license, your keys, or even wear, like a watch, a pen,
or glasses: it made it to the list of the few items that you carry with you. If you are a teenager,
a gaming device or an MP3 player also made their room in your pocket, and if you are a busy
executive a personal organizer is maybe more likely to have this privilege. Figure 1.1
illustrates the integration of new features trend; conversely, the wireless communication
technology will be pervasive in different end-equipments and create new markets for wireless
modules embedded in cars for example.
To some, the use of a mobile phone in public places is an annoyance. Peer pressure
‘‘dictates’’ you have a mobile phone to be reachable ‘‘anywhere any time’’; not having a mobile
phone becomes anti-social in Scandinavian countries for example, where penetration is higher
than 70% of the whole population. Like for every disruptive technology widely used, a
new etiquette has to be understood and agreed upon, e.g. phones have to be turned off or put
The Application of Programmable DSPs in Mobile Communications2
Figure 1.1 Integration and exportation of functions to and from the mobile phone
in silent mode at concerts or in restaurants. Phones are now programmed with different ringing
profiles that are ‘‘environment friendly’’ (e.g. meeting mode rings only once and makes the
phone vibrate). In the future, we might see phones that are environment aware, with sensors that
detect if the phone is in a bag and needs to ring louder for example. In the past, Matra-AEG, now
Nokia Mobile Phones, introduced a GSM phone that had an infra-red sensor that served as a
proximity detector so as to put the phone automatically on or off hands-free mode. Ringing
profiles have also other nice applications: paired with CallerID, they enable users to have
different ringing tones for different callers (friends, family, business partners, unknown…).
1.2 The Super Phone?
To the vast majority, the mobile phone is the ultimate telecommunication tool, via voice or
short messages, soon to become multimedia messages or multimedia communications.
For some, it is a foregone conclusion that wireless terminals will continue their mutation
from fairly simple, voice-oriented devices to smarter and smarter systems capable of
increasingly more complex voice and data applications. The argument goes that wireless
phones will take on the capabilities of Personal Digital Assistants (PDAs) and PDAs will
subsume many of the voice communications capabilities of mobile phones. This line of
reasoning proclaims that the handsets of the future eventually will become some sort of
super-phone/handheld computer/PDA. But in the end, the marketplace is never nearly as
neat and tidy as one might imagine. Rather than an inexorable quest for a one-size-fits-all
super-phone, the fractious forces of the market, based as they are on completely illogical
human emotions, no doubt will lead handset manufacturers down a number of avenues in
support of 2.5G and 3G applications (2.5 and 3G refer to coming phone standard genera-
tions to be described later in this book). Many mobile handsets will be capable of converged
voice/data applications, but many will not. Instead, they will fulfill a perceived consumer
need or perform a certain specialized function very well. Rather than a homogenous market
of converged super-phones, the terminal devices for next generation applications will be as
diverse as they are today, if not more so. And they will be as diverse as the applications that
will make up the 2.5G and 3G marketplace. Mobile device OEMs must be prepared to meet
the challenge of a diverse and segmented market. Figure 1.2 illustrates how wireless phone
service started to be affordable to a few privileged business professionals and how it
diversified in time to become a consumer item. The high-end phone of today is the classic
phone of tomorrow as fashion and technology evolve and as people become used to inno-
vations brought to them.
We believe that the increasing need for function diversification will drive the program-
mable DSP into an even more integrated role within the mobile devices of tomorrow. Non-
programmable DSP architectures will have to take on many traits of the programmable DSP
in order to compete with it. The later chapters of this book highlight that the future of
programmable DSPs in mobile applications hinges on their ability to bring the right level
of flexibility, along with low power performance.
Over the last several years, the market for terminals first became polarized and then
stratified. The market first polarized at the high and low ends of the spectrum. As more
features and functions could be added to handsets, they were and this made up the high
end. But to attract new subscribers, wireless carriers still wanted low-end, low-cost yet robust
Introduction 3
mobile phones. In fact, for the service provider offering free handsets to each new subscriber,
the lower the cost of the handset, the better off the service provider would be.
In the last few years though, the market has shown that it will spli...

---