Advantages and disadvantages of QPSK

The QPSK stands for Quadrature phase shift keying. We know that the QPSK is a digital technique wherein two binary bits are represented by a change in carrier phase by 90 degrees with respect to the other nearby constellation. This article gives information about the advantages and disadvantages of QPSK to know more details about it.

Advantages of QPSK:
  • QPSK provide very good noise immunity
  • It provides low error probability
  • Bandwidth is twice efficient is compared to BPSK modulation
  • For the same BER, the bandwidth required by QPSK is reduced to half as compared to BPSK
  • It is more efficient utilization of the available bandwidth of the transmission channel
  • Carrier power almost remains constant because of OQPSK amplitude is not much
Disadvantages of QPSK:
  • QPSK is not more power efficient modulation technique compare to other modulation types as more power is required to transmit two bits
  • QPSK is more complex compared to BPSK receiver due to four states needed to recover binary data information