DQPSKDifferential Quadrature Phase Shift Keying
DQPSKDifferential Quaternary Phase Shift Keying
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The phase of this largest value would provide the other 2 bits of the 8-bit code word after DQPSK demodulation.
Furthermore, we assume the PHY frame to last Ns = 40 OFDM symbols that carry data modulated with DQPSK and robust DBPSK.
The CoreOptics 40 Gbit/s Coherent-Polarized QPSK (CP-QPSK) DWDM transponder CO40TDL40 supports dual polarization, DQPSK modulation and coherent detection with DSP technologies.
Moreover, since the structures of delay line interferometer and optical mixer grow in complexity in DQPSK and DP-QPSK modulations, the PLC technology which helps reduce their size, cost and power consumption becomes very useful.
You can use the reference design for technologies such as 100-Gbps Ethernet, 14-Gbps Fibre Channel, 40-Gbps DQPSK (differential quadrature phase-shift keying), and 100-Gbps DP-QPSK (dual-polarisation phase-shift keying).
* Differential quadrature phase shift keying (DQPSK) is the four-level version of DPSK, in which each symbol transmitted has two encoded bits (00, 01, 11 and 10).
For the 2Mps transmission the modulation form is rotated Differential Encoded Quadrature Phase-Shift Keying ([pi]/4 DQPSK).
Tokyo, Japan, June 26, 2007 - (JCN) - In April 2007, Yokogawa and Fujitsu collaborated to develop the world's first differential quadrature phase shift keying (DQPSK) technology to enable 40Gbps in optical communications.
In differential QPSK (DQPSK), the information is encoded in the relative changes of the phase.
Typical applications for the RF2485 include digital and spread spectrum systems; GMSK, QPSK, DQPSK and QAM modulation; private mobile radio and TETRA systems; AM, SSB, DSB modulation and image-reject up-converters.