Disadvantages of QPSK are large interchannel interferences, required filtering, consonant synchronization, and more bandwidth usage for transmitting power. Its disadvantages are just matters of consumption and constant fine-tuning.
QPSK require less bandwidth compare to psk
the phase shift allowed in OQPSK is 900 whereas in QPSK it is 1800 . QPSK is used in uplink whereas OQPSK is used in downlink.
See the question "What is QPSK". If you want the difference between QPSK and some other modulation system, you'll need to name the other one.
in psk,we use only single type of phase shift for a bit transition. in qpsk,we use 4 types of phase shifts for a bit transition.
the disadvantage of a fixed pulley is not to push it down and up
QPSK = Quadrature Phase Shift Keying In QPSK amplitude are not much.so the carrier is constant. transmission rate is higher when compared with PSK
bit error is same for QPSK and BPSK. :
QPSK require less bandwidth compare to psk
See the question "What is QPSK". If you want the difference between QPSK and some other modulation system, you'll need to name the other one.
the phase shift allowed in OQPSK is 900 whereas in QPSK it is 1800 . QPSK is used in uplink whereas OQPSK is used in downlink.
Qpsk has lesser bw than dpsk but has more probability in error than dpsk.
QPSK is used in CDMA because it helps achieve higher data rates. It is much better than simple PSK.
qpsk modulation
QPSK
in psk,we use only single type of phase shift for a bit transition. in qpsk,we use 4 types of phase shifts for a bit transition.
qpsk
Generation and detection of QPSK is complex.