Quadrature phase occurs when two periodic waveforms have a phase difference of 1/4 of their output period.
QAM is a combination of phase modulation & amplitude modulation.
The aim is to increase capacity of the system as the signal can be represented using different phase angles as well as amplitude. F.Mmbaga
Quadrature axis of a magnetomotive force is defined as that component of MMF that is directed along an axis in quadrature with the axis of the field poles. Quadrature axis of a magnetomotive force is defined as that component of MMF that is directed along an axis in quadrature with the axis of the field poles.
It has several meanings, none of which have anything to do with computer programming. In mathematics, a Quadrature is a numerical integration.
A complex number is a combination of real and imaginary numbers. An example of a complex number is the expression (a + jb), in which the letter j is called an 'operator'. In this example, the operator +j indicates that the quantity b is acting at an angle of +90o to quantity a -or is 'leading' a by 90o. If the operator was -j, then it would be indicating that quantity bis acting at -90o to quantity a -or is 'lagging' a by 90o.Mathematicians use the letter 'i' to represent an imaginary number, but in electrical engineering we use the letter 'j'. This is because we already use a lower-case 'i'to represent an instantaneous value of current. In mathematics, the operator is sometimes written after the quantity to which it applies (i.e. 'bj'), but it is more usual, in engineering, to place the operator in front of that quantity (i.e. 'jb').The application of the operator 'j' to a phasor, then, acts to rotate that phasor, counterclockwise, through 90 degrees.The term, 'imaginary', is misleading -it doesn't mean that it exists only in the mind! It is simply a mathematician's term for 'quadrature', meaning 'lying along the y-axis'.A.C. quantities, such as current and voltage, can be resolved into horizontal and vertical components. So, we can represent an alternating-current quantity by a complex number which represents its in-phase component together with its quadrature (plus or minus 90o) component. For example, 3+j4 could represent a 5-A current, whose in-phase component is 3 A, and whose quadrature component is 4 A (i.e. which leads the in-phase component by 90o).Complex numbers enable complex a.c. circuits to be resolved relatively easily, and without the need to construct complicated phasor diagrams.As in-phase and quadrature ('imaginary') components only apply to a.c. quantities, we do not need to apply complex numbers to d.c.
The fields are in time phase and space quadrature.
Generation and detection of QPSK is complex.
QAM is a combination of phase modulation & amplitude modulation.
zero demodulated signal, which occurs for phase angle equal to + or - 90degrees, represent Quadrature Null Effect of the coherent detector.
by maximizing the measurable differences between shifts in phase and amplitude
Differential Phase shift key (DPSK) Quadrature amplitude modulation (QAM)
QPSK = Quadrature Phase Shift Keying In QPSK amplitude are not much.so the carrier is constant. transmission rate is higher when compared with PSK
Phase shift keying Quadrature shift keying
Differential Phase shift key (DPSK) Quadrature amplitude modulation (QAM)
The aim is to increase capacity of the system as the signal can be represented using different phase angles as well as amplitude. F.Mmbaga
Quadrature axis of a magnetomotive force is defined as that component of MMF that is directed along an axis in quadrature with the axis of the field poles. Quadrature axis of a magnetomotive force is defined as that component of MMF that is directed along an axis in quadrature with the axis of the field poles.
It has several meanings, none of which have anything to do with computer programming. In mathematics, a Quadrature is a numerical integration.