Hi. I wanted to know about the preambles that are inserted in the ofdm packet. I know they are inserted for the synchronization and frequency offset purposes. But I want to know where in the OFDM packet they are inserted. I have following questions.
1. How can I vary the length of preambles? Can I do that ?
2. On which parameters length of preamble depends?
3. What is the length of preamble sequence if I am using fft-length=512, occupied carriers=200 cp-length=128, size of ofdm packet=400 bytes, modulation='bpsk'.
4. Where are they inserted in the OFDM packet? I mean before Payload?
-------------------------------------------- preamble| payload| --------------------------------------------
5. Both the preambles are inserted at the start ?