[SOLVED] QPSK Data rate Question

[rawanayyoub]

Hi all,
Please I need to ask what's the data rate of QPSK signal ??? its bit rate or the symbol rate , in my system I use 20k Hz as frequency of bit in each branch I and Q branches , then if I faced Question about the Data Rate of my system which the answer 20K Hz or 40K Hz , and this values related to symbol rate or bit rate ?????? Please I need help at this situation so badly.

Thanks in advance,
Rawan Ayyoub

 

[cntube]

20ksymbols/s and 40 kbps

 

[RCinFLA]

20ksymbols/s and 40 kbps

and has nothing to do with I/Q channels, other then the required bandwidth of each I and Q channel is half the full RF channel bandwidth required to carry the modulation.

The reason for I/Q channels require half the bandwidth is, math-wise, because they contain negative and positive frequency, or more specifically negative and positive relative phase relationships between the I/Q channels.

 

[rawanayyoub]

Thanks all for replay, for more clearly to me , Please

20ksymbols/s and 40 kbps

from your answer Data rate is the bit rate and these two formula according to it, this correct or no ??!!

With My deepest thanks,
Rawan Ayyoub

 

[zorro]

Data rate is the speed at which data are transmitted. It is measured in bits/second.
Symbol rate is related to data rate and the method of modulaton. It is measured in symbols/second.
Regards

Z