Re: Mobile phone systems (Re: Di ddo^.ng from Ddo^~ Hu`ng)

["Doan Hong Nghia" <nghia@telemedia.hu>]

Hi anh Hu`ng & anh So+n,

Some books about mobile communications:

1. Cellular Digital Packet Data, M. Sreetharan, Rajiv Kumar, Artech 
House 1996 ISBN:0-89006-709-0. 

This book talks about how to use CDPD to solve mobile 
data communications challenges. Where are you're searching for the 
technical details of CDPD networks operations - or you need a better 
understanding of the options available to you when choosing a 
wireless data transfer technology, this book gives you the background 
you need.

2. CDMA for Wireless Personal Communications, Dr. Ramjee Prasad, 
Artech House 1996 ISBN: 0-89006-5761-3

Code Division Multiple Access (CDMA) is a hot topic. Until now, it 
has only been used in satellite and millitary systems, but engineers 
are starting to recognize certain advantages it has over FDMA and 
TDMA for use in cellular radio. This book provides the first 
comprehensive analysis of the theory and practical applications of 
CDMA. Authored by a recognized expert in the field, it presents CDMA 
as a multiple access protocol for wireless indoor, outdoor, and land 
mobile satellite communications systems.

3. Wireless Communications in Developing Countries: Cellular and 
Satellite Systems, Rafael E. Schwartz, Artech House, 1996, ISBN: 0-
89006-874-7.

You one-stop resource on wireless systems in emerging markets.

4. Personal Communications Systems and Technologies, John Gardiner, 
Barry West, Artech House, 1995, ISBN:0-89006-588-8.

5. An Introduction to GSM, Seigmund Redl, Matthias Weber, Malcom W. 
Oliphant, Artech House, 1995, ISBN:0-89006-785-6

and more ....

For more informations, please send a mail to me.

> Date sent:      Mon, 16 Jun 1997 07:07:27 -0500 (CDT) 
> Send reply to:  vnsa-l@csd.uwm.edu
> From:           Phan Anh Son <Phan@PGSM.HU>
> To:             Multiple recipients of list <vnsa-l@csd.uwm.edu>
> Subject:        Mobile phone systems (Re: Di ddo^.ng from Ddo^~ Hu`ng)

> Cha`o ba'c Ddo^~ Hu`ng va` ca'c ba'c quan ta^m dde^'n Mobile phone,
> 
> Ba'c Hu`ng ho?i ca'ch dda^y dda~ la^u, nay ra?nh ro^~i to^i xin tra?
> lo+`i:
> >
> >Na(m ngoa'i, va`o khoa?ng cuo^'i tha'ng 10, to^i co' tham quan trie^?n
> >la~m Telecom ta.i TP HCM, tha^'y ca'c ha~ng nu+o+'c ngoa`i tie^'p thi.
> >kha' ghe^ ve^` PHS va` CDMA. Kho^ng bie^'t ca'c co^ng nghe^. na`y co'
> >thi'ch ho+.p vo+'i VN kho^ng. Ba'c na`o co' tho^ng tin xin "chi? gia'o".
> >
> >
> 
> To^i xin ddi tu+` xa ho+n mo^.t chu't:
> Ca'c he^. mobile phone co' hai loa.i chi'nh: Digital (GSM, CDMA,
> D-AMPS...)
> va` Analog (AMPS, NMT,..) 
> 
> Ti'nh theo Access Technology thi` co' 3 loa.i:
>    FDMA (Frequency-Division Multiple Access) -  Mo^~i ng` no'i tre^n 1
> ke^nh
>    TDMA (Time- ===#===) - Mo^~i ng` no'i tre^n 1 Time Slot
>    CDMA (Code-Division Multiple Access) -ta^'t ca? du`ng chung 1 freq.
> mo^~i ng` chi? kha'c nhau ve^` ma~ so^'.
> 
> CDMA
> ^^^^^^^^
> la` he^. cu?a My~ do ha~ng Qualcom dde^` xu+o+'ng va` chu? ye^'u
> du`ng o+? My~ va ` mo^.t so^' n'c cha^u A'. He^. na`y cu`ng vo+'i GSM 
> ddu+o+.c coi la` tie^n tie^'n nha^'t hie^.n nay. Hie^.n CDMA co' khoa?ng
> 1 trie^.u subs. (GSM: ~35 trie^.u). 
> U+u ddie^?m:
>    +Capacity lo+'n (8-10 la^`n so vo'+i AMPS, 1,5 - 3 la^`n so vo"i GSM)
>    +De^~ thie^'t ke^' ma.ng: ta^'t ca? dde^`u du`ng chung 1 freq.
>    +Wide-ban=>Kho' ga^y nhie^~u
> Nhu+o+.c die^?m: mo^.t mobile co' su+. co^' co' the^? ga^y ro^'i loa.n
> cho ca? da`i pha't.
> 
> PHS (Personal Handyphone System) 
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> (theo anh Le Thanh Nam va` mo^.t so^' nguo^`n tin kha'c)
> 
> la` he^. cu?a Nha^.t tu+` giu+~a na(m '95. Dda^y kho^ng ha(?n la`
> mobile phone, ma` gio^'ng cordless phone ho+n, da`nh cho ng` ddi bo^.
> U+u die^?m: 
>    +low power (10-20 mW vs. 1-5W in other systems)  
>    +Gia' tha`nh re?
>    +high-speed digital connection: du`ng cho laptop ddu+o+.c
> Nhu+o+.c ddie^?m:
>    +Chi? du`ng ddu+o+.c cho ng` di bo^ (<10km/h)
>    +Die^.n phu? so'ng nho? (ba'n ki'nk 100-500m/tra.m pha't)
> 
> Theo to^i thi` GSM hay CDMA dde^`u thi'ch ho+.p cho VN ca?.
> Hie^.n ta.i thi` dda~ co' 2 he^. GSM va` 1(?) he^. D-AMPS, nhu+
> va^.y thi` kha? na(ng CDMA va`o VN la` nho? vi` 1 nu+o+'c chi?
> ne^n co' 3,4,5 operator la` cu`ng. PHS co' nhie^`u kha? na(ng va`o
> VN ho+n. Theo to^i ddu+o+.c bie^'t thi` cuo^'i na(m '96 NEC co'
> giu'p VN la`m 1 he^. PHS pilot vo"i khoa?ng 40 tra.m pha't va`
> 100 handset.
> NEC vu+`a la^.p join venture vo+'i VNPT ve^` mobile communiction
> 
> Tha^n,
> Son,
> 
> P.S: Ba'c na`o quan ta^m sa^u ho+n dde^'n dde^` ta`i na`y mail
> rie^ng cho to^i, to^i se~ gu+?i cho.
> 

Cheers,

Doan Hong Nghia