Bandwidth requirements if the modulation is BFSK?

[Tjvelcro]

Homework Statement

A binary signal is filtered with r = 1 and then modulated onto a carrier for transmission at
9600 bps.
a) What is the bandwidth requirements if the modulation is BFSK with f1 = 100kHz and f2 = 120kHz?
(Note: FSK bandwidth is B = 2fd + (1+r)R )

b) Using the same centre frequency as in b), choose two new frequencies with minimum
frequency separation

Homework Equations

a) I think I have to use the equation they give in the note... B = 2fd + (1+r)R
b) I found the following equation in my book... 2fd = 1/T

The Attempt at a Solution

r = 1 R = 9600bps B = ? fd = 20000Hz (not sure if this is correct, I just took the differenceof the 2 frequencies given.
B = 2*fd + (1+r) R = 2*20000 + (1+1) 9600 = 59200Hz

b) Not sure how to use the equation 2fd = 1/T with what I'm given.

Tjvelcro

 

[Valkarie]

we:a) B = 2*(f2-f1) + (1+r)*R = 2*(120kHz-100kHz) + (1+1)*9600bps = 59200Hzb) 2*fd = 1/T; fd = 1/(2T); T = 1/400kHz; fd = 400kHz; f2 = 600kHz; f1 = 200kHz