What is Rx?
Rx (Receive) in wireless communications refers to the process of capturing incoming radio frequency signals and converting them into usable data. The receive chain in a 5G device or base station includes the antenna, low-noise amplifier (LNA), filters, down-converter, ADC, and digital baseband processing. Rx performance — characterised by sensitivity, selectivity, and dynamic range — directly determines coverage, cell-edge throughput, and interference handling capability of the wireless system.
How Does Rx Work?
The Rx chain begins at the antenna, where the electromagnetic wave is captured and converted to an electrical signal. The LNA amplifies this weak signal while adding minimal noise (characterised by the noise figure, typically 1–3 dB for 5G devices). Band-pass filters reject out-of-band interference. The signal is then down-converted to baseband or IF using a mixer and local oscillator, digitised by the ADC, and processed through the digital baseband (FFT, channel estimation, equalization, demodulation, decoding). Key Rx performance metrics include reference sensitivity (minimum signal level for a given throughput), maximum input level (largest signal handled without distortion), adjacent channel selectivity (ability to reject neighbouring channel interference), and in-band blocking (resistance to strong in-band interferers).
Use Cases
5G NR UE and base station receiver design, receiver sensitivity and selectivity testing, link budget analysis, coverage planning, and RF front-end performance optimization.
3GPP / Standards Reference
3GPP TS 38.101 (NR UE Rx requirements), 3GPP TS 38.104 (NR BS Rx requirements)
Related Terms
Learn More
This glossary entry is part of the 5GWorldPro Complete 5G Glossary. To go deeper into 5G architecture and technology, explore our 5G Training courses.
