The receiver operates by first capturing the RF signal from the antenna and then amplifying it using a low noise amplifier (LNA) to minimize signal degradation. After amplification, the RF signal is downconverted to a lower intermediate frequency (IF) before demodulation, making it easier to process.
Both the direct wave from the upper and lower antennas, as well as the multipath signals arriving through various propagation paths, pass through two identical processing channels. Each channel includes a bandpass filter to remove unwanted frequencies, followed by the LNA for further amplification. Next, a mirror filter suppresses image frequencies, and the signal is then processed by a frequency converter. This is followed by a pre-amplifier stage before the signals are combined. Finally, the intermediate frequency modulated signal is amplified by the main IF amplifier and output for further processing or decoding.
This design ensures high sensitivity, good selectivity, and effective handling of multipath interference, which is crucial in modern wireless communication systems.
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