Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

CDMA and WCDMA signal bandwidth

Status
Not open for further replies.
W

Willem

Member level 2
Joined
May 17, 2005
Messages
43
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,288
Activity points
1,726
Hi

What is the signal bandwidth of a CDMA signal after spreading, also for WCDMA. There has to be a standard. I know CDMA uses a 1.25MHz channel and then spreads it, but to what? and WCDMA uses a 5 MHz channel and then spreads it.

Any help?
 

Willem said:
Hi

What is the signal bandwidth of a CDMA signal after spreading, also for WCDMA. There has to be a standard. I know CDMA uses a 1.25MHz channel and then spreads it, but to what? and WCDMA uses a 5 MHz channel and then spreads it.

Any help?
Click to expand...

For example in WCDMA, they use spreading codes such that a frame of 10ms contain 38400 chips, or 3.84 Mchips/s. they use raise cosine filter with roll off factor .22:

Hence the total bandwidth used is data rate R*1.22=3.84*1.22=4.6848MHz; hence in 5 MHZ band rest is the gaurd band.
 

well WCDMA use 5MHz band...and signal bandwidth is also little less than 5 MHz and rest is guard band, same iwth CDMA,.... so in these schemes signals uses complete channel bandwidth...and difference is in the coding
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top