What is the difference between cdma and gsm?

[electroon]

what is the difference between cdma and gsm and wat is sos

 

[ee_expert2000]

Re: cdma

the main difference is the access method.
CDMA stands for code division multiple access.
here, users share the same frequency band but in GSM, the users are associated to various frequency channels on which TDMA scheme is also used.
this scheme causes the modulation scheme to be different.
check this link:

**broken link removed**

 

[Lupin]

Re: cdma

Can anyone explain to me what is a Modulation Scheme?

I'm quite new to this subject.

Thanks in advance.

Lupin

 

[ee_expert2000]

Re: cdma

the modulation used in these systems is different.

For GMSK modulation in GSM see this:
http://www.emc.york.ac.uk/reports/linkpcp/appD.pdf

For Spread Spectrum modulation in CDMA see this:
http://www.sss-mag.com/ss.html

I hope this helps.

 

[lincolndsp]

Re: cdma

gsm is 2g narrowband
cdma 3g wideband

 

[silawi]

Re: cdma

another book

hi.... unfortunately i couldnt download those files bcoz i dont have enough points, anyway i wanna ask u what are the hot research topics regaring CDMA? i will be more than happy if u could help me ...........

 

[joinfaisal]

Re: cdma

what is the difference between cdma and gsm and wat is sos

GSM is 2G mobile technology where TDMA and FDMA is utilized for simultanuous access of different mobile users, while CDMA is mobile communication system which is wideband and in this system each user signal is spread according to a specified code so that signals from each user can be separated at the receiver end.

This is just a basic different,, but there are number of other technical difference too....

 

[IEEE2006]

Re: cdma

i need a good topic on wcdma for my project

 

[ypnayak]

Re: cdma

u can refer matlab documentaion manual from mathworks.com

 

[haseebcu]

Re: cdma

Consult SY1 manual. U can get a copy from the google

 

[smartem]

Re: cdma

You have excelente book here. You help me very much. Thanks everybody who post the books.

 

[ypnayak]

Re: cdma

the books are verygood books for reference

Added after 2 minutes:

i could not down load the books bcoz i dont have enough points can any body upload for free

 

[yaseen1]

Re: cdma

Code division multiplexing

 

[tkkg3000]

Re: cdma

Hi Everybody!
The topic about CDMA you can search by Google, you can see the fundamental about it!
This is book for WCDMA:
W-CDMA and cdma2000 for 3G Mobile Networks
Author:M.R. Karim and M. Sarraf
Publisher:Mc GrawHill
Pages:401
Link:**broken link removed**
This is the useful book for everybody who wants to research about WCDMA!
Regard.

 

[han00oo]

Re: cdma

hi hi hi
the most interesting book i've ever found regarding CDMA you can download from this link



"How CDMA works":

Basic CDMA Principles
• Coding
• Forward and Reverse Channels
CDMA Operational Details
• Multiplexing, Forward and Reverse Power Control
CDMA Handset Architecture
CDMA Handoffs
CDMA Network Architecture
CDMA Messaging and Call Flow
Optional Topics
Wireless Multiple Access Technologies
Overview of Current Technologies
• Capacity; CDMA Overlays, Spectrum Clearing

 

[mansoorahmed]

Re: cdma

HI
Matlab code????

 

[haif]

cdma

THE MAJORE DIFFERENCES IS THE CAPACITY OF THE SYSTEM AND THE FREQUENCY HOPING