Why Bluetooth 2 use pi/4-DQPSK instead of OQPSK?

1. What is the disadvantage of OQPSK?
2. Does Bluetooth use QPSK?
3. What is Dqpsk modulation?
4. What is pi 4 QPSK?

What is the 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.

Does Bluetooth use QPSK?

By these techniques the Bluetooth can achieve data rate of 2Mbps with π/4-DQPSK and 3Mbps with 8DPSK. The combination of these BR and EDR mode is classified as a “BR/EDR radio”.

What is Dqpsk modulation?

Differential Quadrature Phase Shift Keying. Differential Quadrature Phase Shift Keying is a modulation technique in which the carrier can assume one of four phases, each change of phase, or symbol, representing 2bits. The bit combinations being 00, 01, 11 and 10.

What is pi 4 QPSK?

π/4 shifted version of QPSK is referred as pi/4 QPSK. With this modulation compromise between QPSK and OQPSK is done and maximum phase transition of about 135 degree is achieved. In the presence of the multipath spread and fading conditions, pi/4 QPSK perform better than OQPSK.