build an OQPSK passband model

Hi,

I have to build an OQPSK passband model. Now there are two choices:

1. modem.oqpskmod function (in form of I+jQ) + multiplication (as mixer) + passband filter (to filter out images)

2. 2 Bits in groups and then 00: represented as cos(wt + 45 degrees) 01: represented as cos(wt + 135 degrees) 10: represented as cos(wt + 225 degrees) 11: represented as cos(wt + 315 degrees)

Which method is better?

Best Wishes Owen

Answer 1

[Tasos Giannoulis]

Hi Owen,

Why do you want a passband signal? You can get the baseband oqpsk signal, e.g., with oqpskmod or comm.OQPSKModulator, and if you want to transmit or receive, then you can simple specify the frequency (e.g., 2.4. GHz) at the radio transmitter/receiver. The radio will do the upconversion/downconversion for you.

Tasos