Why 8-PSK modulation has higher Eb/N0 than QPSK or BPSK?

1. Why QPSK is better than PSK?
2. What is the difference between QPSK and 8PSK?
3. Which has more bandwidth QPSK or BPSK?
4. Why do BPSK and QPSK have the same BER?

Why QPSK is better than PSK?

QPSK allows the signal to carry twice as much information as ordinary PSK using the same bandwidth. QPSK is used for satellite transmission of MPEG2 video, cable modems, videoconferencing, cellular phone systems, and other forms of digital communication over an RF carrier.

What is the difference between QPSK and 8PSK?

QPSK, or Quadrature Phase-Shift Keying, uses four distinct phase-shifts to encode data. These phase-shifts are 45 degrees, 135 degrees, 225 degrees and 315 degrees. In contrast, 8PSK, or Eight Phase-Shift Keying, uses eight distinct phase-shifts.

Which has more bandwidth QPSK or BPSK?

Quadrature phase-shift keying (QPSK).

In comparison to OOK and BPSK, QPSK enables the data rate to be doubled while keeping the same bandwidth, meaning it's also possible to stay at the same data rate at half the bandwidth, with the same bit error ratio (BER). So QPSK is suitable for data rates of 100 Gbps as well.

Why do BPSK and QPSK have the same BER?

The probability of error is identical for BPSK and QPSK because the BER has been measured in terms of signal to noise ratio per bit.