Receiver Sensitivity Vs Coding rate & modulation type

Hi All,

How does the receiver sensitivity depends on moduletion type and coding rate for a fixed receiver bandwidth?

Ex: For Rx BW 5 MHz, sensitivity is given as following for different modulation and coding rate.

5 MHz BW
Modulation Coding rate Receive Sensitivity
2xQPSK 0.75 -89 dBm
2xQPSK 0.5 -92 dBm
2xBPSK 0.5 -94 dBm

Can anyone expain?

In fact, the situation is reversed. Certain modulation types offer different error rates for various receiver signal to noise ratio (you call it sensitivity). Thermal noise affects more signal amplitude than its phase. I would recommend you to study books by Feher about modulation types, where the author explains the error rate vers. noise in detail.