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Learn about channel rejection in receivers, measuring interference handling, and signal power dynamics. Explore examples and sensitivities for WLAN chips.A receiver's capability to reject unwanted signals from adjacent or co-channel sources is essential for optimal performance in modern communication systems. This title provides insights into key metrics and scenarios, helping to understand receiver behavior.
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Selectivity / Channel Rejection • Gives a measure of how good the receiver is at handling interference Desired signal / Interferer Power Alternate channel rejection/ Selectivity [dB] Adjacent channel rejection [dB] Co-channel rejection [dB] Frequency Channel separation Channel separation
Blocking Desired signal / Interferer Power Frequency Frequency Offset • Gives a measure of how good the receiver is at handling interference from a source further away in frequency
Receiver Example Desired signal / WLAN Power Frequency 5 MHz Chip A Chip B Sensitivity: -100 dbm -97 dBm Blocking: 27 dB +/- 5 MHz offset 55 dB +/- 5 MHz offset Case 1: The power from the WLAN is –80 dBm. Receiver A can receive a –100 dBm signal. Receiver B can receive a –97 dBm signal. No degradation in receiver sensitivity.
Receiver Example 2 Desired signal / WLAN Power Frequency 5 MHz Chip A Chip B Sensitivity: -100 dbm -97 dBm Blocking: 27 dB +/- 5 MHz offset 55 dB +/- 5 MHz offset Case 2: The power from the WLAN is –40 dBm. Receiver A can receive a -40-27 = -67 dBm signal. Receiver B can receive a -40-55 = -95 dBm signal. Receiver B have 27 dB better receiver sensitivity.
