Howtosignalprocessing
- What is BER for QPSK?
- What is OQPSK modulation?
- What is a disadvantage of OQPSK?
- Why OQPSK is the preferred mode of modulation?
What is BER for QPSK?
Transmitting a symbol takes twice as long as a bit (Ts = 2·Tb) which means that the bandwidth efficiency of QPSK is twice that of BPSK. Bit error rate (BER) of a communication system is defined as the ratio of number of error bits and total number of bits transmitted during a specific period.
What is OQPSK modulation?
Description. The OQPSK Modulator Baseband block modulates the input signal using the offset quadrature phase shift keying (OQPSK) method and applies pulse shape filtering to the waveform. For more information, see Pulse Shaping Filter. The output is a baseband representation of the modulated signal.
What is a disadvantage of OQPSK?
A disadvantage of OQPSK is that it introduces a delay of half a symbol into the demodulation process. In other words, using OQPSK increases the temporal efficiency of normal QPSK. The reason is that the in phase and quadrature phase components of the OQPSK cannot be simultaneously zero.
Why OQPSK is the preferred mode of modulation?
In practice, the OQPSK modulation scheme is sometimes preferred as it contributes to lower amplitude fluctuations and distortions compared to a QPSK signal. The phase shift response of an OQPSK signal is shown below.
