* Question
| How to deal with complex signals? |
* Answer
| From the spectrum conversion relationship of the single-stage heterodyne receiver, it is known that the processing of the signal by the front-end circuit of the transceiver is only the shift of the spectrum, and the signal form and the modulation mode are not changed, and the change of the signal form and the modulation mode is followed.Completed in the end circuit.The local oscillator and multiplier in the mixer are regarded as two sub-modules inside a single module. The above three functions can be regarded as a single-input single-output system. The frequency domain characteristics of the receiver and the transmitter can be regarded as none.The signal processing chain of the bypass.The basic content of the transceiver design is to choose the bandwidth of the filter, the gain of the amplifier, and the frequency of the mixer.The choice of transceiver structure is nothing more than how many levels of these three modules are combined.The complex signal analysis method has been widely used in digital signal processing, and it is an important means to analyze the multipath signal processing system as a single path signal processing system. The receiver and transmitter using orthogonal processing technology are such multiple.A typical example of path signal processing. |
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