Howtosignalprocessing
- What is direct down conversion?
- What is IQ signal in RF?
- What is IQ correction?
- What is DC offset in direct-conversion receiver?
What is direct down conversion?
A direct down-conversion receiver down-converts the received RF signal directly into a complex baseband signal. On the other hand, a heterodyne receiver requires the IF stage to down-convert the RF to IF before demodulating the received analog signal to complex baseband signal (see the following note).
What is IQ signal in RF?
Quadrature signals, also called IQ signals, IQ data or IQ samples, are often used in RF applications. They form the basis of complex RF signal modulation and demodulation, both in hardware and in software, as well as in complex signal analysis.
What is IQ correction?
Math of I/Q Correction
is the baseband frequency of the tone. However, due to the different channel environments and component properties, there is usually DC bias, as well as the offset on the phase and the amplitude, which makes the two signals as following: and.
What is DC offset in direct-conversion receiver?
DC offsets from strong out-of-band interference
Thus, only a local oscillator is required, which implies that only a single-phase noise will be contributed to the section. The need for bulky filters is also removed since majority of the filtering is now done only at baseband with a higher amplification.
