Home page of Satellite Internet and Information

Satellite Internet Forum.

Welcome, Guest.
Welcome to this satellite broadband discussion forum. Wherever you are and whatever your problem we are here to help each other. Connecting to the internet via satellite is not always easy but is critically important to those in remote places or with poor terrestrial infrastructure. Both service providers and customers are encouraged to contribute. Register at the bottom of the forum home page if you wish to contribute or ask question. Read the Forum rules.
      Satellite Internet Forum : Home Page          
Pages: 1

Nyquist filter bandwidth

(Read 2597 times)
Ex Member
Ex Member

Jan 10th, 2011 at 8:07am  
I have a data rate of 2.048 Mbps data rate. I need to modulate at 70 MHz by using QPSK modulation.
I selected a filter bandwidth of 1.3312 MHz which is 1.3 times of symbol rate. My question is incase if i have a nyquist bandwidth filter(datarate/2=1.024MHz) is available at 70 MHz can i use that kind of filter ? In this case 1 time of the symbol rate. Please clarify.
Back to top
IP Logged
Eric Johnston
Senior Member

Personal text from Profile,
Options, Top line

Posts: 2108
Reply #1 - Jan 10th, 2011 at 4:09pm  
An important consideration for you should be the specification that you are trying to meet in terms of the spectrum of your transmiied signal to avoid unacceptable interference to adjacent carriers.

These links may help you:

If your information rate is 2048 kbit/s don't forget to add the FEC overhead, if applicable, to get the higher transmission rate.

Best regards, Eric.
Back to top
IP Logged
Pages: 1