Calculating Bandwidth

[peethol]

Hi

I want to calculate the bandwidth of a wireless link. The system runs at 76 Kilo baud, using either QPSK or BPSK.

I'm not sure how to do it, if there are parameters short to do the calculation please let me know.
Any help or references will be appreciated.

Thank you.

 

[ninju]

I don't know if this would help, but, try simulating a wave and plotting its power spectrum.

Else, i think there are some standard formulae available for calculating bandwidth. It will be in terms of bit duration.

 

[peethol]

Thank you but I need to use a formula to calculate it.
Anyone know what that formula(s) are?

 

[farfaei]

Thank you but I need to use a formula to calculate it.
Anyone know what that formula(s) are?

QPSK's practical bandwidth efficiency is around 1.6 b/Hz/s, and each sybol represents 2 bits, so your BW is Baudrate times 1.6 devide by 2. Find bandwidth efficniency for each scheme.

 

[Ahmed Alaa]

You must specify the pulse shape, a rectangualr pulse differs from RRC, gaussian,..etc. You also need to define the BW (3-dB, Null-to-null, power confinment,...etc). If assume Null-to-null bandwidth for BPSK, then I think the bandwidth is the inverse of the symbol duration (or proportional to this), QPSK will have half of this BW.