I/Q baseband Modulator Demodulator

Status
Not open for further replies.
A

adnan012

Advanced Member level 1
Joined
Oct 6, 2006
Messages
468
Helped
2
Reputation
4
Reaction score
2
Trophy points
1,298
Activity points
4,923
hi,

I want to understand I/Q modulation and demodulation process. I want to module a 10MHz bit stream (each bit has 100 nsec duration). Bit stream is in the form of 0 and 1. I want to perform BPSK.

How can i convert it to i/q base-band? What is the significance of I/Q modulation and demodulation?

Regards
 


this technique is quite popularly used in bandpass modulation in Digital communication, you need to take a look at "Digital Communication book" (maybe chapter 4) from Prof. SKLAR first, then go further to mod/demo circuit later
 
FvM said:
BPSK doesn't involve quadrature modulation, see https://en.wikipedia.org/wiki/Phase-shift_keying
Click to expand...

In this case I/Q-modulation is overkill, but I think it can be used to create any modulation.
BPSK is easy to do, just set Q=0 and change I between +1 and -1 according to the data bits.
A more complex example is SSB, which is possible but not trivial to do with I/Q-modulation. The modulation signal must be transformed.
 
Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…