In recent years, the bandwidth achieved per wavelength typically is 100 Gbps with the polarization-multiplexed quadrature phase shift keying
In addition, compared to Binary Phase Shift Keying (BPSK) signals, little work have been done on the bandwidth efficient Quadrature Phase Shift Keying
(QPSK) modulation signals in multicell DAS .
Quadrature Phase Shift Keying
(QPSK) is a modulation scheme commonly used in wireless communication system due to its ability to transmit twice the data rate for a given bandwidth .
where B is the occupied bandwidth of the RF modulated signal and SNR = [E.sub.b]/[N.sub.0] = 6.8 dB for a quadrature phase shift keying
(QPSK) modulation with optimal filtering.
ABSTRACT: This paper derives accurate analytical expressions for bit-error (BER) and symbol-error (SER) rate of different modulation schemes such as binary phase shift keying (B-PSK), binary frequency shift keying (B-FSK), quadrature phase shift keying
(Q-PSK), 8-phase shift keying (8-PSK) and 16- quadrature amplitude modulation (16-QAM) over Nakagami-m fading channels respectively.
Wu, "Direct quadrature phase shift keying
modulator using six-port technology," Electronics Letters, Vol.
Nokia Siemens Networks provided a solution based on its multi-reach hiT 7300 DWDM platform that uses coherent transmission technology, in particular a modulation format called CP-QPSK (coherent polarization multiplexed quadrature phase shift keying
The modulation schemes used are Quadrature Phase Shift Keying
(QPSK), 16-Quadrature Amplitude Modulation (16-QAM) and 64-QAM.
High-speed optical communications technology provider Opnext Inc (Nasdaq:OPXT) announced on Wednesday that it has demonstrated a single wavelength, real-time coherent 127G PM-QPSK (Polarisation Multiplexed Quadrature Phase Shift Keying
) modem on the TeliaSonera network running through Sweden.
Customers can leverage the solutionAcentsAAs advanced signal processing technologies, which use Dual Polarization Quadrature Phase Shift Keying
(DP QPSK) modulation, coherent detection and electronic dispersion compensation to transmit four times as much information across existing 10G networks.
* 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).