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# Bandwidth and frequency spectrum of QPSK signal

Posted on 2010-08-14

I have this question for course work that i am stuck on. If anyone could point me to some examples of how to achieve this or just point me in the right direction or even let me know how i would go through it with different values, it would be much appreciated.

Assume that the QPSK signal has a carrier frequency is 1800 MHz and the bit rate is 270 kbit/s. Draw a diagram showing the frequency spectrum of the QPSK signal, labelling any important frequencies. Explaining your answer, calculate the bandwidth of the QPSK signal.

Explaining your answers, determine the bandwidth if the modulation method had been

• 8-PSK

• 256-QAM