手机中的IQ宽带调制（IQ broadband modulation in mobile phones）.docVIP

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手机中的IQ宽带调制（IQ broadband modulation in mobile phones）.doc

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手机中的IQ宽带调制（IQ broadband modulation in mobile phones）

手机中的IQ宽带调制（IQ broadband modulation in mobile phones） Briefly: Its the direction of the vector, which is the same signal as the direction of the vector; Two vector orthogonal signal quadrature component is poor (90 °); IQ signal is 0 ° and 180 ° all the way, another Angle is 90 ° and 90 °, called I and Q road, they are two orthogonal signals. IQ broadband modulator [em14] I/Q signals are generally referred to as 67.70825 KHz modulated signals after RF transceiver. It is a two - way signal that the modulation input terminal is designed to improve the frequency band utilization. I is the component of the same phase (in-phase), the projection of the vector on the horizontal axis; Q is the magnitude of the Quadrate, the projection of the vector onto the vertical axis. In a communication system, (speech signal) is the information to be transmitted by modulation and demodulation. In a digital communication system, the message is data. Digital modulation is the process of loading data into rf carriers, while demodulation is the process of removing data from rf signals. The parameters of rf carrier signal A cos (2 PI FCT + theta) can be changed only by amplitude, frequency and phase. The modulation method that changes the carrier amplitude is called amplitude modulation (AM). Changing carrier frequency is called FM. The modulation of the carrier phase change is called phase modulation (PM). Since the derivative of the phase is the frequency, the amplitude and phase of the carrier signal can be said to be two major variable variables. If the amplitude and phase modulation of the carrier of information recorded, and the two-dimensional space on behalf of the amplitude and phase respectively, and the two variables so arbitrary point on the polar coordinates and phase Angle, the distance to the origin would be on behalf of the carrier amplitude and phase, also can saying is on behalf of the carrier modulation. The transformation of polar coordinates means that the method can be